contents - Bock Water Heaters
CONTENTS
Warnings and Cautionary Statements .......................................................................................................... 2
Comparisons of Fuel Prices and Operating Costs ....................................................................................... 3
Estimated Annual Cost of Operation; Oil-Fired Units ................................................................................... 4
Estimated Annual Cost of Operation; Gas Units and Electrical Units .......................................................... 5
General Information ...................................................................................................................................... 6
Oil-Fired Water Heater Installation, Pipe Sizes, Alternatives ...................................................................... 7
Piping Fuel Lines for Bock Oil-fired Water Heaters ................................................................................... 9
Gas-Fired Water Heater Installation ........................................................................................................... 11
Indirect Water Heater Installation ............................................................................................................... 12
Sizing:
Boiler and Circulator Sizing ................................................................................................................. 12
General Sizing Formula, Sizing for BTUH Input .................................................................................. 14
Indirect Water Heater Applications ...................................................................................................... 14
Multiple Dwelling Buildings .................................................................................................................. 15
Expansion Tank Sizing ......................................................................................................................... 16
Hair Salons, Barber Shops, Car Washes, Places of Worship, Schools
............................................ 17
Industrial Plants, Dairy Barns, Care Centers, Dorms, Office Buildings, Clubs ..................................19
Hot Water Requirements for Fixtures and Machines .......................................................................... 20
Shower Head Availability ..................................................................................................................... 21
Food Service Establishments .............................................................................................................. 22
Machine Dishwasher Requirements .................................................................................................... 23
Self-Service and Commercial Laundries, Swimming Pools, Hot Tubs, Baptistries ............................. 26
Venting:
Venting the Water Heater, Types of Venting, Individual Vents ............................................................. 28
The Common Vent ............................................................................................................................... 29
Combustion/Ventilation Air, Balanced Combustion System, Insufficient or Excessive Draft ............. 30
Barometric Draft Controls, Power Vent Selection – Tjernlund Products ............................................. 31
Power Vent Selection – Field Controls, Draft Inducer ......................................................................... 32
Installation and Hookups:
Specialized Installation Hookups ......................................................................................................... 33
Indirect Installation ............................................................................................................................... 34
System Plus Installation ....................................................................................................................... 36
Radiant Heating ................................................................................................................................... 37
Combined Appliance Sizing ..................................................................................................................... 38
Multiple Hookups: Parallel, Series, Isolating, Reverse Storage Tank.......................................................... 38
Isolating Series, Reverse Storage Tank System Hookups ................................................................... 40
Weights, Measures, Metric Conversions ............................................................................................. 42
Tables:
Vent Tables........................................................................................................................................... 43
Indirect, Oil, Gas Performance Tables ................................................................................................. 55
2
Measuring Combustion Efficiency Using Oxygen (O )......................................................................... 74
Glossary of Terms .................................................................................................................................... 75
Engineering Manual
WARNINGS AND CAUTIONARY STATEMENTS
Warning!
Improper installation, adjustment, alteration, service or
maintenance can cause severe property damage and
personal injury or death. Refer to instruction manuals for
recommended procedures. For assistance or additional
information, consult a qualified installer, service agency
or the water heater supplier.
result, causing severe property damage and personal
injury or death. Immediately contact a qualified service
technician to inspect the entire unit and to replace any
part of the control system that has been under water.
Caution:
A program of regular maintenance should be established
to keep the heater operating at peak efficiency with
maximum safety and to extend the life of the unit. Refer
to the instruction manual supplied with the heater and
consult the supplier or a qualified service agency for a
recommended maintenance program.
When a water heater is installed in a closed system, such
as with a backflow preventer installed on the cold water
inlet, excessive pressure can build up, resulting in a tank
rupture causing severe property damage and personal
injury or death. An expansion tank must be installed to
relieve excessive pressure buildup in the heater tank.
Contact a local water supplier or plumbing inspector to
correct the situation.
Warning!
Warning!
Do not install the heater on combustible flooring. Fire
may result, causing severe property damage and personal
injury or death. Install in accordance with all local codes.
In the absence of local codes, refer to National Fuel Gas
Code ANSI Z223.1-1999 or to NFPA 31: “Installation of
Oil Burning Equipment.”
Natural gas leaks can result in an explosion causing
severe property damage and personal injury or death. If
the smell of gas is noticeable do the following:
For your information
4 Do not try to light any appliance.
4 Do not touch any electrical switch. Do not plug in or
unplug any electrical appliance.
4 Do not use the telephone in the building.
4 Immediately contact the gas supplier from a neighbor’s
telephone and follow the supplier’s instructions.
4 If the supplier cannot be reached, call the fire department!
Caution:
In Canada, installation must be in accordance with Standard CAN 1-B149.1 or .2: “Installation Codes for Gas Burning Appliances and Equipment,” and/or local codes.
The highest recommended temperature setting for normal
residential use is 120OF. The dial on the aquastat does
not always reflect the outcoming water temperature and it
could occasionally exceed 120OF. Variation in outcoming
temperature could be based on factors including but not
limited to usage patterns and type of installation. Test the
water at the tap nearest the water heater.
Code compliance is the sole responsibility of the installing contractor.
Danger!
Important: All flooring must have adequate support.
Warning!
Do not store or use gasoline or other flammable liquids
and vapors near this heater or any other appliance. Fire
or explosion can result, causing severe property damage
and personal injury or death. Chlorine may produce a
poisonous gas and may ignite other combustible materials. As a vapor, it may cause the steel heater jacket to
become compromised (as a liquid, chlorine has no effect
on the interior of the Bock
-lined tanks).
Warning!
Do not install or operate a water heater if any part has
been under water. Electrical shock or short circuit can
www.bockwaterheaters.com
Hotter water increases the risk of severe scald injury or
death. Before changing temperature settings, refer to the
instruction manual. Temperatures at which injury occurs
vary with the person’s age and length of exposure. The
slower reaction time of children, the elderly or physically
or mentally challenged persons increases the scalding
hazard to them. It is recommended that lower water temperatures be used where these exposure hazards exist.
To produce less than 120OF, use point-of-use temperature
limiting devices.
Warning!
Water heater blankets may restrict air flow to the heater
and cause fire, asphyxiation, personal injury or death and
should not be used on Bock products.
Engineering Manual
TABLE 1
COMPARISONS OF FUEL PRICES AND OPERATING COSTS
COST PER
THERM
FUEL OIL
PER GAL.
0.600
0.832
0.650
0.902
0.700
0.971
0.7501.040
0.8001.110
0.8501.179
0.9001.248
0.9501.318
1.0001.387
1.0501.456
1.1001.526
1.1501.595
1.2001.664
1.2501.734
1.3001.803
1.3501.872
1.4001.942
1.450
2.011
1.500
2.081
1.550
2.150
1.600
2.219
1.650
2.289
1.700
2.358
1.750
2.427
1.800
2.497
1.850
2.566
1.900
2.635
1.950
2.705
2.000
2.774
2.050
2.843
2.100
2.913
2.150
2.982
2.200
3.051
2.250
3.121
2.300
3.190
2.350
3.259
2.400
3.329
2.450
3.398
2.500
3.467
2.550
3.537
2.600
3.606
2.650
3.676
2.700
3.745
2.750
3.814
2.800
3.884
2.850
3.953
2.900
4.022
2.950
4.092
3.000
4.161
3.050
4.230
3.100
4.300
3.150
4.369
3.200
4.438
3.250
4.508
3.300
4.577
3.350
4.646
ELECT.
PER KWH
LP
PER GAL.
0.020
0.548
0.022
0.594
0.024
0.639
0.026
0.685
0.027
0.731
0.029
0.776
0.031
0.822
0.032
0.868
0.034
0.913
0.036
0.959
0.0381.005
0.0391.050
0.0411.096
0.0431.142
0.0441.187
0.0461.233
0.0481.279
0.0491.324
0.0511.370
0.0531.416
0.0551.461
0.0561.507
0.0581.553
0.0601.598
0.0611.644
0.0631.690
0.0651.735
0.0671.781
0.0681.827
0.0701.872
0.0721.918
0.0731.964
0.075
2.009
0.077
2.055
0.078
2.101
0.080
2.146
0.082
2.192
0.084
2.238
0.085
2.283
0.087
2.329
0.089
2.375
0.090
2.420
0.092
2.466
0.094
2.512
0.096
2.557
0.097
2.603
0.099
2.649
0.101
2.694
0.102
2.740
0.104
2.786
0.106
2.831
0.107
2.877
0.109
2.923
0.111
2.968
0.113
3.014
0.114
3.060
LP
PER LB.
NAT. GAS
PER THERM
0.129
0.600
0.140
0.650
0.150
0.700
0.161
0.750
0.172
0.800
0.182
0.850
0.193
0.900
0.204
0.950
0.2151.000
0.2251.050
0.2361.100
0.2471.150
0.2581.200
0.2681.250
0.2791.300
0.2901.350
0.3001.400
0.3111.450
0.3221.500
0.3331.550
0.3431.600
0.3541.650
0.3651.700
0.3761.750
0.3861.800
0.3971.850
0.4081.900
0.4191.950
0.429
2.000
0.440
2.050
0.451
2.100
0.461
2.150
0.472
2.200
0.483
2.250
0.494
2.300
0.504
2.350
0.515
2.400
0.526
2.450
0.537
2.500
0.547
2.550
0.558
2.600
0.569
2.650
0.580
2.700
0.590
2.750
0.601
2.800
0.612
2.850
0.622
2.900
0.633
2.950
0.644
3.000
0.655
3.050
0.665
3.100
0.676
3.150
0.687
3.200
0.698
3.250
0.708
3.300
0.719
3.350
Operating cost for 2000 gal. hot water per month
(normal residential use – 90OF rise)
FUEL OIL
ELECT.
LP
NAT. GAS
$13.84
$14.99
$16.15
$17.30
$18.45
$19.61
$20.76
$21.91
$23.07
$24.22
$25.37
$26.53
$27.68
$28.83
$29.99
$31.14
$32.29
$33.45
$34.60
$35.75
$36.91
$38.06
$39.22
$40.37
$41.52
$42.68
$43.83
$44.98
$46.14
$47.29
$48.44
$49.60
$50.75
$51.90
$53.06
$54.21
$55.36
$56.52
$57.67
$58.82
$59.98
$61.13
$62.28
$63.44
$64.59
$65.74
$66.90
$68.05
$69.20
$70.36
$71.51
$72.66
$73.82
$74.97
$76.12
$77.28
$10.34
$11.20
$12.06
$12.93
$13.79
$14.65
$15.51
$16.37
$17.23
$18.10
$18.96
$19.82
$20.68
$21.54
$22.40
$23.27
$24.13
$24.99
$25.85
$26.71
$27.58
$28.44
$29.30
$30.16
$31.02
$31.88
$32.75
$33.61
$34.47
$35.33
$36.19
$37.05
$37.92
$38.78
$39.64
$40.50
$41.36
$42.22
$43.09
$43.95
$44.81
$45.67
$46.53
$47.39
$48.26
$49.12
$49.98
$50.84
$51.70
$52.57
$53.43
$54.29
$55.15
$56.01
$56.87
$57.74
$15.78
$17.10
$18.41
$19.73
$21.04
$22.36
$23.67
$24.99
$26.31
$27.62
$28.94
$30.25
$31.57
$32.88
$34.20
$35.51
$36.83
$38.14
$39.46
$40.77
$42.09
$43.40
$44.72
$46.03
$47.35
$48.66
$49.98
$51.30
$52.61
$53.93
$55.24
$56.56
$57.87
$59.19
$60.50
$61.82
$63.13
$64.45
$65.76
$67.08
$68.39
$69.71
$71.02
$72.34
$73.65
$74.97
$76.29
$77.60
$78.92
$80.23
$81.55
$82.86
$84.18
$85.49
$86.81
$88.12
$13.84
$14.99
$16.15
$17.30
$18.45
$19.61
$20.76
$21.91
$23.07
$24.22
$25.37
$26.53
$27.68
$28.83
$29.99
$31.14
$32.29
$33.45
$34.60
$35.75
$36.91
$38.06
$39.22
$40.37
$41.52
$42.68
$43.83
$44.98
$46.14
$47.29
$48.44
$49.60
$50.75
$51.90
$53.06
$54.21
$55.36
$56.52
$57.67
$58.82
$59.98
$61.13
$62.28
$63.44
$64.59
$65.74
$66.90
$68.05
$69.20
$70.36
$71.51
$72.66
$73.82
$74.97
$76.12
$77.28
TABLE 1 continued on next page ...
Engineering Manual
... TABLE 1 continued
COMPARISONS OF FUEL PRICES AND OPERATING COSTS
BTU
content
FUEL
Thermal
Service
efficiency efficiency
Unit of
measure
Nat Gas1,025
Cubic Feet
78%
57%
138,700
Gallon
80%
65%
Electricity
3,412
K. W. H.
96%
87%
Propane
91,333
Gallon
78%
57%
Fuel Oil
Monthly Cost Equation
Cost $ = $ / therm * 1 therm / 100,000 BTU * 8.33 Btu / (gal*deg) * 90 deg. * 2000 gal
Service Efficiency
TABLE 2
Estimated Annual Cost of Operation, Oil-FIRED Units
FUEL COST
PER
GALLON
($)
0.56
0.58
0.60
0.62
0.64
0.66
0.68
0.70
0.72
0.74
1.50
1.55
$337
$348
$325
$336
$314
$325
$304
$314
$295
$304
$286
$295
$277
$286
$269
$278
$262
$271
$255
$263
1.60
1.65
$359
$370
$347
$357
$335
$346
$324
$334
$314
$324
$305
$314
$296
$305
$287
$296
$279
$288
$272
$280
1.70
1.75
$381
$393
$368
$379
$356
$366
$345
$355
$334
$344
$324
$333
$314
$323
$305
$314
$297
$305
$289
$297
1.80
1.85
$404
$415
$390
$401
$377
$387
$365
$375
$353
$363
$343
$352
$333
$342
$323
$332
$314
$323
$306
$314
1.90
1.95
$426
$438
$412
$422
$398
$408
$385
$395
$373
$383
$362
$371
$351
$360
$341
$350
$332
$340
$323
$331
2.00
2.05
$449
$460
$433
$444
$419
$429
$405
$415
$393
$402
$381
$390
$370
$379
$359
$368
$349
$358
$340
$348
2.10
2.15
$471
$482
$455
$466
$440
$450
$426
$436
$412
$422
$400
$409
$388
$397
$377
$386
$366
$375
$357
$365
2.20
2.25
$494
$505
$477
$487
$461
$471
$446
$456
$432
$442
$419
$428
$407
$416
$395
$404
$384
$393
$374
$382
2.30
2.35
$516
$527
$498
$509
$482
$492
$466
$476
$452
$461
$438
$447
$425
$434
$413
$422
$401
$410
$391
$399
2.40
2.45
$539
$550
$520
$531
$503
$513
$486
$497
$471
$481
$457
$466
$443
$453
$431
$440
$419
$428
$408
$416
2.50
2.55
$561
$572
$542
$552
$524
$534
$507
$517
$491
$501
$476
$485
$462
$471
$449
$458
$436
$445
$425
$433
2.60
2.65
$583
$595
$563
$574
$544
$555
$527
$537
$510
$520
$495
$505
$480
$490
$467
$476
$454
$462
$441
$450
2.70
2.75
$606
$617
$585
$596
$565
$576
$547
$557
$530
$540
$514
$524
$499
$508
$485
$494
$471
$480
$458
$467
2.80
2.85
$628
$639
$607
$617
$586
$597
$567
$578
$550
$560
$533
$543
$517
$527
$503
$512
$489
$497
$475
$484
2.90
2.95
$651
$662
$628
$639
$607
$618
$588
$598
$569
$579
$552
$562
$536
$545
$521
$530
$506
$515
$492
$501
3.00
3.05
$673
$684
$650
$661
$628
$639
$608
$618
$589
$599
$571
$581
$554
$564
$539
$547
$524
$532
$509
$518
3.10
$696
$672
$649
$628
$609
$590
$573
$556
$541
$526
ENERGY FACTOR (EF)
Formula to determine yearly cost of operation:
Oil:
(
47,743 BTU
EF
Nat Gas:
Elec:
(
(
)(
fuel cost / gallon
138,700 BTU / gal
47,743 BTU
EF
47,743 BTU
EF
)(
)(
www.bockwaterheaters.com
therm
kWh
*
)
days
year
* 100,000 BTU ) (
1 therm
$
$
)(
365
1 kWh
3,412 BTU
=
365
)(
365
$
year
days
year
days
year
)
=
)
=
$
year
$
47,743 BTU = Nominal amount of
energy needed to heat 64.3* gallons of water at a 90OF rise.
* 64.3 gallons is the U.S. Department of Energy daily average
usage.
year
Engineering Manual
TABLE 3
Estimated Annual Cost of Operation, GAS-FIRED Units
ENERGY FACTOR
COST
PER
THERM
($)
0.56
$171
$174
$177
$181
$184
$187
$190
$193
$196
$199
$202
$205
$209
$212
$215
$218
$221
$224
$227
$230
$233
$237
$240
$243
$246
$249
$252
$255
$258
$261
$265
0.55
0.56
0.57
0.58
0.59
0.60
0.61
0.62
0.63
0.64
0.65
0.66
0.67
0.68
0.69
0.70
0.71
0.72
0.73
0.74
0.75
0.76
0.77
0.78
0.79
0.80
0.81
0.82
0.83
0.84
0.85
0.58
$165
$168
$171
$174
$177
$180
$183
$186
$189
$192
$195
$198
$201
$204
$207
$210
$213
$216
$219
$222
$225
$228
$231
$234
$237
$240
$243
$246
$249
$252
$255
0.60
$160
$163
$166
$169
$171
$174
$177
$180
$183
$186
$189
$192
$195
$198
$200
$203
$206
$209
$212
$215
$218
$221
$224
$227
$229
$232
$235
$238
$241
$244
$247
0.62
$155
$157
$160
$163
$166
$169
$172
$174
$177
$180
$183
$186
$188
$191
$194
$197
$200
$202
$205
$208
$211
$214
$216
$219
$222
$225
$228
$231
$233
$236
$239
0.64
$150
$153
$155
$158
$161
$163
$166
$169
$172
$174
$177
$180
$182
$185
$188
$191
$193
$196
$199
$202
$204
$207
$210
$212
$215
$218
$221
$223
$226
$229
$231
0.66
$145
$148
$151
$153
$156
$158
$161
$164
$166
$169
$172
$174
$177
$180
$182
$185
$188
$190
$193
$195
$198
$201
$203
$206
$209
$211
$214
$217
$219
$222
$224
0.68
$141
$144
$146
$149
$151
$154
$156
$159
$161
$164
$167
$169
$172
$174
$177
$179
$182
$185
$187
$190
$192
$195
$197
$200
$203
$205
$208
$210
$213
$215
$218
0.70
$137
$139
$142
$144
$147
$149
$152
$154
$157
$159
$162
$164
$167
$169
$172
$174
$177
$179
$182
$184
$187
$189
$192
$194
$197
$199
$202
$204
$207
$209
$212
0.72
$133
$136
$138
$140
$143
$145
$148
$150
$153
$155
$157
$160
$162
$165
$167
$169
$172
$174
$177
$179
$182
$184
$186
$189
$191
$194
$196
$199
$201
$203
$206
0.74
$130
$132
$134
$137
$139
$141
$144
$146
$148
$151
$153
$155
$158
$160
$163
$165
$167
$170
$172
$174
$177
$179
$181
$184
$186
$188
$191
$193
$196
$198
$200
TABLE 4
Estimated Annual Cost of Operation, ELECTRIC Units
ENERGY FACTOR
COST
PER
($)
kWh
0.80
0.81
0.82
0.83
0.84
0.85
0.86
0.87
0.88
0.89
0.90
0.91
0.92
0.93
0.94
0.95
0.035
0.040
0.045
0.050
0.055
0.060
0.065
0.070
0.075
0.080
0.085
0.090
0.095
0.100
0.105
0.110
0.115
0.120
0.125
0.130
$223
$255
$287
$319
$351
$383
$415
$447
$479
$511
$543
$575
$607
$638
$670
$702
$734
$766
$798
$830
$221
$252
$284
$315
$347
$378
$410
$441
$473
$504
$536
$568
$599
$631
$662
$694
$725
$757
$788
$820
$218
$249
$280
$311
$343
$374
$405
$436
$467
$498
$529
$561
$592
$623
$654
$685
$716
$747
$779
$810
$215
$246
$277
$308
$338
$369
$400
$431
$462
$492
$523
$554
$585
$615
$646
$677
$708
$738
$769
$800
$213
$243
$274
$304
$334
$365
$395
$426
$456
$486
$517
$547
$578
$608
$638
$669
$699
$730
$760
$790
$210
$240
$270
$300
$331
$361
$391
$421
$451
$481
$511
$541
$571
$601
$631
$661
$691
$721
$751
$781
$208
$238
$267
$297
$327
$356
$386
$416
$445
$475
$505
$535
$564
$594
$624
$653
$683
$713
$742
$772
$206
$235
$264
$294
$323
$352
$382
$411
$440
$470
$499
$528
$558
$587
$616
$646
$675
$705
$734
$763
$203
$232
$261
$290
$319
$348
$377
$406
$435
$464
$493
$522
$551
$580
$609
$638
$667
$697
$726
$755
$201
$230
$258
$287
$316
$344
$373
$402
$430
$459
$488
$517
$545
$574
$603
$631
$660
$689
$717
$746
$199
$227
$255
$284
$312
$341
$369
$397
$426
$454
$482
$511
$539
$568
$596
$624
$653
$681
$709
$738
$196
$225
$253
$281
$309
$337
$365
$393
$421
$449
$477
$505
$533
$561
$589
$617
$645
$674
$702
$730
$194
$222
$250
$278
$305
$333
$361
$389
$416
$444
$472
$500
$527
$555
$583
$611
$638
$666
$694
$722
$192
$220
$247
$275
$302
$330
$357
$384
$412
$439
$467
$494
$522
$549
$577
$604
$632
$659
$687
$714
$190
$217
$245
$272
$299
$326
$353
$380
$408
$435
$462
$489
$516
$543
$571
$598
$625
$652
$679
$706
$188
$215
$242
$269
$296
$323
$349
$376
$403
$430
$457
$484
$511
$538
$565
$591
$618
$645
$672
$699
Engineering Manual
GENERAL INFORMATION
The Bock line of residential, commercial and industrial
water heaters is constructed for lasting peak performance
and high efficiency. TURBOFLUE® is the principal component, whether used as a single center flue or in multiflue
heaters. It is the combination of all innovative Bock components that makes our name synonymous with quality.
Proper selection and installation of one or more Bock
units will meet virtually any hot water requirement. This
manual will assist in determining which model or models
are required and how, when and where accessory items
should be used to make the installation safe, efficient and
easily maintained.
Fuel Oils
Most oil-fired water heaters use No. 2 grade fuel oil. Bock
oil-fired water heaters will efficiently burn No.’s 1 and 2
grade fuel oils as well as kerosene and diesel fuel. Special
burners for larger units are available from Bock to fire on
No. 4 grade fuel oil.
IMPORTANT: Oil filters should be installed on inlet lines
to the burners to prevent foreign particles from clogging
the nozzles.
Fuel Gases
TABLE 6
Recommended Gas Pressures*
Type of Gas
Natural Gas Before
Gas Control
5” w.c. After
Gas Control
3.5” w.c.
Liquified Petroleum11” w.c.10” w.c.
* Check burner & valve specifications
Downrating for Altitude
Heaters that are installed above 2,000 feet above sea
level must be downrated to function properly. Heaters
are downrated according to the following:
Oil-fired:
Rule of thumb: Downrate input 5% for every 1,000 ft
above 2,000 ft above sea level.
Therefore, if elevation > 2,000 ft, then,
Downrated input = (rated input) - (0.05) ( Elevation - 2,000 ft )*
1,000 ft
*(rated input)
Gas-fired:
Fuel gases used for heating water throughout the United
States fall into two classifications: natural gas and liquid
petroleum (butane and propane). Bock gas-fired water
heaters are shipped to burn one of these two standard
gases (see Table 5).
TABLE 5
Rule of thumb: Downrate input 4% for every 1,000 ft
above 2,000 ft above sea level.
Therefore, if elevation > 2,000 ft, then,
Downrated input = (rated input) - (0.04) ( Elevation - 2,000 ft )*
1,000 ft
*(rated input)
Heat Content & Specific Gravity
Combustion and Ventilation Air
Type of Gas Care must be taken to ensure an adequate air supply
for combustion equipment is installed in every type of
structure. If the water heater will be installed in closely
confined areas such as closets or small utility rooms, the
air supply must provide ventilation as well as combustion
air. These areas must be vented at the floor for combustion air and at the ceiling for ventilation. Eleven cubic feet
of air is required for every 100,000 BTUs.
Heat content of Gas BTU/CU.FT. Specific Gravity
of Gas
Natural Gas 1050 0.65
Liquified Petroleum:
Butane 3200 2.00
Propane 2550 1.53
Water heaters using gasses other than the standard types
may be ordered directly from Bock, but requirements
must be carefully specified. The following information
must be given when ordering:
Buildings with concrete slab foundations and interior equipment rooms require the combustion air to be brought in
from the attic space to within six inches of the floor. Consult
local codes and ordinances or NFPA 31 and NFPA 54.
1. Type of gas to be used.
Electric
2. Heat content of specified gas in BTU/Cu. Ft.
Electric water heaters for use with 208, 220, 240 and 440
to 480 volts AC can be furnished. Specify use for single
phase or three-phase operation. The highest recovery
rate provided is 222 GPH for a single unit. When large
volumes of hot water are needed, the use of multiple units
is an excellent way to meet requirements.
3. Specific gravity of the gas.
4. Service pressure of the gas at the meter.
Local gas companies and suppliers can usually supply
the above information.
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Engineering Manual
GENERAL INFORMATION (cont.)
Anode Rods
The anode rod is used as a sacrificial element within the
volume of the storage tank. The purpose of the magnesium
anode rod is to protect the inside of the tank against corrosion. Anode rods should be inspected twice in the first
year and at least yearly once a time interval for inspection
has been developed. Water conditions can influence the
consumption rate of the anode rods.
Anode rods should be replaced when the rod diameter
has eroded to two-thirds or less of its original diameter
(Figure 9). If the steel wire core is visible (Figure 10), the rod
has lost its effectiveness.
Figure 10
Figure 9
OIL-FIRED WATER HEATER INSTALLATION
TABLE 8 *
Bock oil-fired water heaters are equipped with single
stage pumps and 3450 RPM burners. Two-stage pumps
are optional.
Use caution in the final connection of tubing to the burner,
particularly on long runs. Do not connect the burner to the
pipe. Use copper tubing between the pipe and the burner.
If possible, form a coil in the tubing before attaching to the
burner to minimize any vibration or joint problems.
When designing a new installation, follow the pump manufacturer’s recommendations for pipe sizes and configuration. Burners are normally shipped with data for the fuel
pump they are equipped with.
TABLE 7 *
Maximum Lift & Horizontal Run
for Oil Units
One-pipe System
LIFT
1/2” O.D.TUBE
0’ 65’ 100’
4’ 45’100’
7’ 31’100’
8’ 16’ Engineering Manual
64’
Two-pipe System with
Two-Stage pump
Two-pipe System with
Single Stage pump
LIFT
0’ 1’ 2’ 3’ 4’
5’
6’
7’
8’
9’
10’
11’
12’
13’
14’
3450 RPM
3/8” O.D. TUBE
3 GPH
7 GPH
1/2” O.D.TUBE
3 GPH
7 GPH
84’ 71’ 100’100’
78’
66’100’100’
73’
62’100’100’
68’
57’100’100’
63’
53’100’100’
57’
48’100’100’
52’
44’100’100’
47’
39’100’100’
42’
35’100’100’
36’
31’100’100’
31’
27’100’100’
26’
22’100’ 87’
21’18’ 83’ 70’
––
–– 62’ 52’
––
–– 41’ 35’
3450 RPM
LIFT
3/8” O.D. TUBE
3 GPH
7 GPH
1/2” O.D.TUBE
3 GPH 7 GPH
0’ 93’
80’100’100’
2’ 85’
73’100’100’
4’ 77’
66’100’100’
6’ 69’
59’100’100’
8’ 60’
52’100’100’
10’ 52’
45’100’100’
12’ 44’
38’100’100’
14’ 36’
31’100’100’
16’ 27’
24’100’ 93’
18’ ––
–– 76’ 65’
Inlet vacuum must not exceed 6
inHg on a one-pipe system. On
a two-pipe system, inlet vacuum
must be less than 12 inHg for “A”
model pumps and 17 inHg for “B”
model pumps.
* Suntec A & B Series pumps
Heaters 361E and larger use 7 gph pumps.
HORIZONTAL RUN
3/8” O.D. TUBE
TABLE 8A *
Inlet vacuum must not exceed 6
inHg on a one-pipe system.
4 On all Bock oil-fired water heaters up through 1.5 GPH
(Models 32E through 72E, equipped with single stage
pumps), use minimum 3/8” O.D. soft copper tubing and a
one-pipe system. Refer to Table 7 (One Pipe System) for
the maximum lift and horizontal run. If the lengths exceed
the table, use a two-stage, two-pipe system or check the
“Alternatives” section following.
4 Important: On water heaters fired at a rate greater than
1.5 GPH, use a two-pipe system. Use 1/2” O.D. or larger
copper tubing.
For multiple heater installations, we recommend separate
lines to each water heater.
If the required lift exceeds recommendations or horizontal
run exceeds 100 feet, check the “Alternatives” section
following.
4 Return lines must be the same diameter as suction line.
4 Both the suction and return lines must extend close to the
bottom of the oil storage tank.
4 Use a minimum number of fittings; preferably, make bends
in the tubing with as large a radius as possible. Use flared
fittings, not compression fittings.
5. If Step 4 is not feasible, tee into the existing suction line
and the existing return line to supply oil to the new burner.
This hookup can be satisfactory if the return line extends
to the bottom of the oil supply tank. But if the tubing is too
small and there is a two-stage pump on the existing heater
the additional heater pump may be starved for fuel oil.
6. Where return lines do not extend to the bottom of the oil
supply tank, use check valves on each suction line located
as close as possible to each burner. This will prevent air
from being drawn through the line.
7. Before teeing into any existing oil line, check the vacuum
on the existing burner by installing a vacuum gauge in the
1/4” inlet port or the vent opening. On a two-pipe system, a
single stage pump should not exceed 8” Hg. vacuum and a
two-stage pump should not exceed 15” Hg. vacuum. If the
vacuum readings do not exceed these limits, the new water
heater can be connected to the existing lines.If the heater
performs poorly, recheck the vacuum reading with all units
in the system operating. A high vacuum reading indicates
too much resistance to proper fuel oil flow, possibly caused
by a clogged filter, restricted shut-off valve, kinked tubing,
obstructed oil line, excessive lift, too long a horizontal run
or an undersized oil line (see Tables 8 and 8A).
Bleed the pumps until the oil loses the milky or opaque
appearance and becomes clear or transparent.
If none of the preceding installation variables are suitable,
Bock recommends installing an oil booster pump as close
to the oil supply tank as possible using the existing supply
and return line. Change the existing unit to a one-pump
system and tee off the one pipe that supplies fuel oil to
the water heater.
Alternatives
Installing a new water heater where there is an existing
oil supply tank and oil lines:
A booster pump must be used for any lift or horizontal run
exceeding Tables 7, 8, and 8A specifications. Booster pumps
must be installed as close as possible to the oil supply tank.
The booster pressure should not exceed 10 lbs. at the burner.
(See NFPA 31 Std.) An OSV valve shall be installed on all
pressurized lines.
Booster pumps may be obtained from Suntec Hydraulics,
Rockford, Illinois.
1. Inspect existing equipment.
2. Determine whether a separate one-pipe system can be
installed to furnish oil to the water heater. A separate
system is ideal.
3. If a separate one-pipe system is not possible and the
heater that is to be replaced is supplied with a one-pipe
system, tee into that one-pipe system to furnish oil to the
new heater burner.
4. If the heater that is to be replaced is supplied with a twopipe system, check to see if the return line extends to the
bottom of the oil supply tank. Consider changing the existing setup to a one-pipe system and changing the return
line to the suction line for the new installation.
Figure 11
Percent of Flue Loss for Fuel Oil
Figure 11 can be used to approximate combustion efficiency or an AFUE number. Using the CO2 reading and net stack temperature, find the % of
flue gas loss. Approximate AFUE = 100 - (% x 100). Example: CO2 = 8% Net Stack = 450oF. Approximate AFUE = 100 - (.22 x 100) = 78.
10
12
14
FLUE
GAS
LOSS
(%)
16
18
20
15%
22
14%
24
7%
8%
9% 10% 11% 12%
13%
26
200oF 250oF
300oF
350oF
400oF
450oF
500oF
550oF
600oF
650oF
700oF
750oF
800oF
FLUE GAS TEMPERATURE MINUS ROOM TEMPERATURE (0F)
8
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Engineering Manual
PIPING FUEL LINES FOR BOCK OIL-FIRED WATER HEATERS
Figure 12: Inside tank, one-pipe overhead installation
A one-pipe overhead installation can be modified by installing a
“floor level“ tee connection to supply fuel oil to the water heater
burner. No return line from the water heater is necessary since
the “floor level“ tee is under head pressure due to gravity from
the fuel tank.
Caution. Be sure that the
internal by-pass plug has
NOT been inserted in the
burner pump.
On a conventional single-pipe installation where the inlet
line is located below the tank and no life is required for
either fuel unit, the inlet line for the water heater burner can
be teed to the supply line at any point. It may be convenient
to connect to the unused inlet port of the other fuel line.
Figure 13: Outside tank, two-pipe installation (burner below tank)
A two-pipe installation can be modified by installing a “floor
level“ tee connection to supply fuel oil to the water heater
burner. No return line from the water heater is necessary since
the “floor level“ tee is under head pressure due to gravity
pressure from the tank.
Engineering Manual
11
Figure 14: Installation using existing outside tank lift; two burners
Figure 15: New installation involving lift from outside tank; two burners
For the addition of an oil-fired water heater to
an existing outside fuel tank installation, it may
not be possible to install a separate suction line.
The suction line for the water heater burner can
be teed to the existing suction line if solenoid
shut-off valves or check valves are installed in
the inlet side of each fuel unit.
Figure 16: Single elevated
heater with storage tank below,
forced oil supply
Individual suction lines should be used to supply fuel to the burners. Individual return lines are
also recommended, but may be tied together
as shown and should run to within 4” of the fuel
tank bottom.
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Engineering Manual
GAS-FIRED WATER HEATER INSTALLATION
Properly sized and installed venting is also vital to
the safe and efficient operation of gas appliances.
National Fuel Gas Code, NFPA 54/ANSI Z223. 1
has extensive guidelines on the proper installation
of venting systems. Tables 23-35 in this manual are
reprinted from the code for your convenience.
When installing a Bock gas water heater, care must
be taken in sizing and installing the gas pipe system.
Gas pipe size and length of run should follow the
guidelines listed in the water heater / gas burner
installation manual. In the absence of this data refer
to the most recent edition of the National Fuel Gas
Code, NFPA 54/ANSI Z223. 1. Table 10 lists data
presented in the code for iron pipe. National Fuel
Gas Code contains more detailed information for
other types of pipe and various gas pressures.
When connecting gas water heaters to a venting
system with other large vent hood equipped appli ances such as the boiler in an apartment building,
the vent system should produce -0.02 in w.c. draft
when only the water heater is operating.
Always measure manifold gas pressure after in stalling the appliance with other appliances in the
system operating. Correct pressure values are listed
on the water heater rating plate. If this pressure
cannot be maintained, the gas piping or main may
be undersized.
Large vent hood equipped appliances can prevent
the vent system from developing draft when only
the water heater is operating. This results in unsafe
combustion and nuisance lock outs. The solution to
this problem is to install automatic vent dampers in
the vent connectors of large appliances to stop any
air flow through the vent hoods of appliances that
are not operating. Alternately, the water heater may
need a draft inducer or its own venting system.
Select a location for the water heater that guaran tees adequate combustion air. Atmospheric water
heaters such as the Bock EZ100-199 must have free
air flow to the bottom of the heater. Failure to supply
adequate air will result in unsafe heater operation.
CO levels in the flue gases exiting the heater should
be checked during operation.
TABLE 10
Maximum capacity of gas pipe in cubic feet per hour
Based on gas pressure of 0.5 PSI, pressure drop of 0.3” W.C. and 0.6 specific gravity
Nominal iron pipe size (in)
LENGTH
(ft)
1/2”
10132
3/4”
278
1” 1 1/4”
1 1/2”
5201,0501,600
2”
3,050 2 1/2”
4,800 3”
4”
8,500 17,500
2,100 3,300 5,900 12,000
20
92190 350 730 1,100 30
73 152 285 590 890 1,650 2,700 4,700 9,700
40
63 130 245 500 760 1,450 2,300 4,100 8,300
50
56 115 215 440 670 1,270 2,000 3,600 7,400
60
50 105 195 400 610 1,150 1,850 3,250 6,800
70
46 96 180 370 560 1,050 1,700 3,000
6,200
80
43 90 170 350 530 990 1,600 2,800 5,800
90
40 84 160 320 490 930 1,500 2,600
5,400
100 38 79 150 305 460 870 1,400 2,500
5,100
125 34 72 130 275 410 780 1,250 2,200 4,500
150 31
64 120 250 380 710 1,130 2,000 4,100
175 28 59 110 225 350 650 1,050 1,850 3,800
200 26 55 100 210 320 610 3,500
980 1,700 Source: 2001 ASHRAE Fundamentals Handbook
Engineering Manual
1
INDIRECT WATER HEATER INSTALLATION
Bock indirect, or SideKick, water heaters offer a
cost effective water heating alternative. These units
utilize circulating boiler - fed hot water through a coil
inside the water tank. Indirects are ideal for applications that use boilers for space heating.
All piping between the boiler and the indirect heater
should be new copper with a minimum size of 3/4” ID
for models 30SK, 40SK, and 50SK. Use 1” minimum
copper for models 80SK and 119SK. Elbows should
be minimized. A flow check valve must be installed
on the return line.
Piping to the inlet (cold) and outlet (hot) domestic
water connections should be new copper with a
minimum size of 1/2” ID for models 30SK, 40SK,
and 50SK. Use 3/4” ID minimum for models 80SK
and 119SK.
Installations should conform to local codes and
ordinances. At a minimum, refer to IHLR 84 code if
local codes are not in place. It is recommended that
all piping be adequately insulated with approved
material to ensure minimum heat loss. If a re-circulation line is used for domestic water, be certain
that all lines are well insulated and the circulator is
temperature controlled. Install isolation valves to
permit proper servicing. It is also recommended to
install a union on the domestic outlet to facilitate
replacement of the hot outlet / anode nipple on
models 30SK, 40SK, and 50SK.
Note: Indirect may be connected to a steam boiler
provided that all piping to and from the boiler are
below the water line of the boiler. Boiler must also be
protected by a low water cut off safety device.
BOILER AND CIRCULATOR SIZING
The ratings published in this manual (Tables 31 and
32) for your Bock Indirect Coil Tank Water Heater
can be obtained through proper selection of boiler
output and circulator capacity. As noted, the ratings in Table 31 are based on a 77°F rise with 58°F
potable water inlet temperature at a circulator pump
flow rate of 8 GPM. The boiler was set at 180°F. See
Table 32 for additional first hour ratings at pump flow
rates of 6, 8, 10 and 12 GPM with 180°F and 200°F
boiler water.
To determine the appropriate circulator for your
system, follow these three steps:
1) Calculate the pressure drop of all straight pipe
and fittings on the supply and return at the desired
flow rate.
2) Add the pressure drop from Step 1 to the pressure drop through the indirect coil tank water heater
coil (see Table 31 for friction loss) to obtain a total
pressure drop.
3) Select a circulator pump that will provide adequate
flow at the total pressure drop.
A pump performance curve should accompany every
circulator pump. Figures 17-19 contain performance
curves for Taco and Grundfos circulator pumps,
recommended by Bock.
Note: Zone valves on the heat source supply to the
indirect heater are not recommended and will drastically reduce performance.
Figure 17: Taco 00 Series performance curves
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Engineering Manual
UP 15-42F/FR
Closed Systems, 60 Hz
Figure 18: GRUNDFOS UP 15-42F performance curve
UP 26-64F
Closed Systems, 60 Hz
Figure 19: GRUNDFOS UP 26-64F performance curve
System performance can also vary based on the
heating capacity of the boiler. If the minimum coil
output (assume coil output = boiler output) listed in
Tables 31 and 32 is not met, the output (first hour
rating) of the water heater will not be met at the
selected flow rate. To approximate the reduction in
first hour rating as a result of low boiler capacity, use
the following formula:
For example, the first hour rating of a 50SK at a
77°F rise with an 8 GPM heat source flow rate using
a boiler having a DOE heating capacity (output) of
60,000 BTU/Hr would be:
New first hour rating = (160 gal) * (60,000 BTU/Hr)/
(77,000 BTU/Hr) = 125 gal
New first hour rating = (First hour rating) * (Actual
boiler output)/(Minimum coil output)
Engineering Manual
1
GENERAL SIZING FORMULA
All requirements for hot water should be totaled to
obtain the maximum amount of hot water required
per hour. Use multiple water heaters when the requirements exceed the capacity of a single heater.
If too many heaters in multiples will be required,
use a storage tank sized to the gallons of hot water
required per peak hour and heat the water in the
tank with heaters having a recovery of one-third
the capacity of the storage tank. Except in the
case of self-service laundries, this total use could
be factored by judgement – assuming that not all
fixtures will be on at the same time – 75% to 80%,
for example.
Sizing Formula for BTUH Input
Desired temperature.....................................140oF
Inlet water temperature..................................50oF
1. Temperature difference...............................90oF
2. Expected flow rate 5 GPM x 60 minutes = 300 GPH
3. BTU/gallon OF (water)................................. 8.25
Total expected BTUH output is:
90oF x 300 gallons x 8.25 BTUs = 222,750 BTUH
To find the input required to produce 222,750 BTUH
output, divide by .80
222,750
.80
= 278,438 BTUH input
* The Bock recommended Recovery / Efficiency
INDIRECT WATER HEATER APPLICATIONS
The Bock indirect water heaters are designed as a
long life water heater for use in domestic and light
commercial applications in buildings using boilers
for space heating. The concept behind using an
indirect is that the boiler heats water when it is not
heating the home. This causes the boiler to run
more frequently, reducing the boiler stand-by times
and associate losses. Installing a dedicated boiler
to power an indirect water heater is not an efficient
way to heat water.
When selecting an indirect water heater, choose a
tank size that can easily meet the immediate hot
water demands of the customer. Do not count on
recovery to help meet the load of a single draw. The
reason for this is that the typical boiler will take two
1 www.bockwaterheaters.com
or more minutes to get to operating temperature
before it can begin to heat the water in the tank.
This means that most or all hot water stored in the
tank could be gone by the time the boiler can begin
to recover the tank.
Example:
The customer uses 40 gallons to fill a bathtub. What
size indirect should be used? The minimum tank
size for this application would be a 50SK. A 40SK
will deliver 33 gallons of usable hot water in a single
draw and would not be able to fill the tub, resulting
in customer complaints.
Engineering Manual
MULTIPLE DWELLING BUILDINGS
Tables 11A, 11B and 11C are based on ASHRAE Chapter
32: “Service Water Heater Tables,” use 3 GPM shower
heads and figure two to 2.5 people per unit. These tables
may not be applicable to FHA sizing for some apartment
building categories due to different diversity factors than
those applied in the ASHRAE Guide.
If larger shower heads or extra-heavy use is predicted,
sizing should be based on Table 11.
TABLE 11
BTUH
95,000
APARTMENTS
2
Apartment Sizing, 4 to 25 units
MOTELS/
LIGHT AVG HEAVY HOTELS
3
Note: U.S. Department of Housing and Urban Development Minimum Property Standards; 4910.1 - 1973, paragraph 615-5 states: “Hot water requirements for multiple
dwellings should be based on design criteria shown in
the ASHRAE Guide.”
TABLE 11A
Apartments, Hotels & Motels
INPUT
Federal regulations require all shower heads to be a
maximum of 2.5 GPM. In older homes and buildings,
larger GPM shower heads may be found and should be
factored into sizing (see Table 15).
1
3
GAS
OIL/PG
1-EZ75-135 1-32E/PG
ELECTRIC INDIRECTS
1-27KW
4
3
2
4
1-EZ75-135 1-51E/PG
1-36KW
1-80SK
140,000
5
4
3
5
1-EZ75-135 1-51E/PG
1-40KW
1-119SK
175,000
6
5
4
6
1-EZ80-156 1-71E/PG
1-54KW
1-119SK
200,000
8
7
6
8
1-EZ80-199 1-72E/PG
2-30KW
2-50SK
230,000
12
10
9
12
1-EZ100-199 1-73E/PG
2-36KW
2-50SK
280,000
20
17
14
20
2-EZ75-135 1-241E/PG
2-45KW
2-80SK
360,000
31
2
18
31
2-EZ80-156 2-71E/PG
3-36KW
2-119SK
460,000
37
28
22
37
2-EZ100-199 1-361E/PG
3-45KW
N/R
500,000
52
40
32
52
3-EZ80-156 2-241E/PG
3-54KW
N/R
600,000
72
55
44
72
3-EZ80-156 1-541E/PG
4-45KW
N/R
1,500,000
221
166
132
221
1-150/250G
N/R
N/R
N/R = Not Recommended
LIGHT LOAD: Two people per unit; 3 GPM shower or
less. Central laundry facilities (for individual laundries
add 10% more input).
AVERAGE LOAD: Three to five people per unit; 4 to
6 GPM shower. Central laundry facilities (for individual
laundries add 10% more input).
HEAVY LOAD: More than six people per unit; two baths.
Individual laundry facilities.
Chart assumes recirculating line. If none, add 20% to
required input.
All sizing based on 100oF rise in water temperature.
Hot water for food service units in motels/hotels should
be sized separatetly.
For 90oF temperature rise, decrease required input by
10%. For 80oF temperature rise, decrease required input
by 20%.
Engineering Manual
50OF
RISE
70OF
RISE
90OF
RISE
100OF
RISE*
MODEL
MODEL
MODEL
MODEL
4
UNITS
OIL
P/GAS
GAS
ELEC.
INDIRECT
32E
32PG
EZ75-135
50F-15
50SK
32E
32PG
EZ75-135
50F-15
50SK
32E
32PG
EZ75-135
50F-15
50SK
51E
51PG
EZ75-135
80F2C-15
80SK
6
UNITS
OIL
P/GAS
GAS
ELEC
INDIRECT
32E
32PG
EZ7513550F-18
50SK
51E
51PG
EZ75-135
50F-18
50SK
51E
51PG
EZ75-135
50F-18
80SK
71E
71PG
EZ75-135
80F-18
80SK
8
UNITS
OIL
P/GAS
GAS
ELEC
INDIRECT
51E
51PG
EZ75-135
80F-15
80SK
51E
51PG
EZ75-135
80F-15
80SK
51E
51PG
EZ75-135
80F-15
80SK
71E
71PG
EZ75-135
80F-18
80SK
10
UNITS
OIL
P/GAS
GAS
ELEC
INDIRECT
51E
51PG
EZ75-135
80F-18
80SK
51E
71PG
EZ75-135
80F-24
119SK
51E
71PG
EZ75-135
N/R
119SK
72E
72PG
EZ75-135
80F-30
119SK
OIL
P/GAS
GAS
ELEC
51E
51PG
EZ75-135
80F-24
51E
71PG
EZ75-135
120F-27
241E
241PG
EZ100-199
120F-30
INDIRECT
119SK
51E
71PG
EZ75-135
120F-27
80F-30
119SK
119SK
80SK(2)
15
UNITS
OIL
P/GAS
GAS
ELEC
INDIRECT
51E
51PG
EZ75-135
80F-30
119SK
51E
71PG
EZ75-135
80F-30
119SK
71E
71PG
EZ80-156
120F-30
119SK
241E
241PG
EZ100-199
120F-36
80SK(2)
20
UNITS
OIL
P/GAS
GAS
ELEC
INDIRECT
71E
71PG
EZ75-135
120F-30
119SK
71E
71PG
EZ75-135
80F-36
119SK
72E
72PG
EZ80-156
80F-45
80SK(2)
241E
241PG
EZ100-199
120F-45
80SK(2)
25
UNITS
OIL
P/GAS
GAS
ELEC
INDIRECT
72E
72PG
EZ80-156
120F-36
80SK(2)
73E
73PG
EZ100-199
120F-45
119SK(2)
241E
241PG
N/R
120F-45
119SK(2)
N/R
N/R
N/R
N/R
N/R
1-80SK
110,000
1-150/
250E/PG
TYPE OF
FUEL
12
UNITS
N/R = Not Recommended
* Note: Indirects are not recommended for use at outlet temperatures of more than 140OF.
15
TABLE 11B
TABLE 11C
Apartment Sizing, 30 to 72 units
Apartment Sizing, 100 to 150 units
TYPE OF
FUEL
30
UNITS
36
UNITS
48
UNITS
72
UNITS
70OF
RISE
90OF
RISE
MODEL
MODEL
MODEL
OIL
72E
(2) 51E
241E
(2) 71E
361E
(2) 71E
P/GAS
72PG
(2) 51PG
241PG
(2) 71PG
361PG
(2) 71PG
GAS
——
EZ80-156
(2) EZ75-135 (2) EZ75-135
——
(2) EZ80-156
ELEC.
120C-45
(2) 52C-24
120C-54
(2) 82C-27
(2) 82C-30
——
OIL
72E
(2) 32PP
241E
(2) 51E
361E
(2) 71E
P/GAS
72PG
(2) 32PG
241PG
(2) 51PG
361PG
(2) 72PG
GAS
EZ80-156
(2) EZ75-135
——
(2) EZ80-156
——
ELEC.
82C-45
(2) 52C-24
120C-54
+ 90-Gal.
(2) 82C-30
(2) 82C-36
——
OIL
241E
(2) 51E
361E
(2) 71E
(2) 73E
P/GAS
241PG
(2) 51PG
241PG
(2) 71PG
(2) 73PG
——
GAS
60
UNITS
50OF
RISE
50OF
RISE
70OF
RISE
90OF
RISE
MODEL
MODEL
MODEL
OIL
150E-800
(2) 241E
(3) 71E
250E-800
(2) 361E
(3) 73E
250E-1000
(2) 541E
(3)361E
P/GAS
(3) 241PG
(3) 361PG
(2) 361PG
(2) 361PG
(3) 73PG
——
——
——
——
(3) EZ80-156
150G-800
150G-800
—
—
(2) 82C-45
(3) 52C-27
(4) 82C-30
(2) 82C-54
(3) 52C-36
(4) 82C-36
(3) 120C-36
250E-800
(2) 361E
(3) 241E
(4) 72E
250E-1000
(3) 361E
(4) 241E
250E-1250
(3) 541E
(4) 361E
(2) 361PG
(3) 241PG
(4) 72PG
(2) 541PG
(3) 361PG
(4) 241PG
(3) 541PG
(4) 3611PG
250G-800
250G-1000
(4) EZ80-156
250G-1500
(3) 82C-54
(4) 82C-45
(6) 82C-54
TYPE OF
FUEL
100
UNITS
GAS
ELEC.
OIL
P/GAS
150
UNITS
GAS
ELEC.
(3) 82C-45
(4) 52C-30
(2) EZ80-156 (2) EZ100-199
ELEC.
(2) 82C-30
——
120C-54
+ 90-Gal.
(2) 82C-36
(2) 120C-45
OIL
361E
(2) 51E
(2) 73E
200E-600
541E
(2) 241E
P/GAS
361PG
(2) 71PG
(2) 73PG
541PG
GAS
(2) EZ80-156
——
——
ELEC.
(2) 120C-30
(2) 82C-45
(2) 120C-54
OIL
361E
(2) 72E
(2) 241E
250E-800
(2) 361E
P/GAS
361PG
72PG
541PG
(2) 241PG
(2) 361PG
Example: Heater capacity = 30 gallons / 10% requires a
minimum three-gallon tank.
GAS
(2) EZ80-156
——
150G-800
Note: For commercial and farm applications, consideration should be given to piping size and capacity.
ELEC.
52C-36
(2) 82C-54
(3) 120C-36
16 www.bockwaterheaters.com
EXPANSION TANK SIZING
The cold water supply to the water heater may contain a
check valve, pressure reducing valve and/or a back flow
preventer, creating a “closed system.” As the heated
water expands, it creates a pressure buildup in the closed
system. This may cause the T&P (temperature and press ure) relief valve to weep and/or discharge water. To
prevent this, an expansion tank must be installed in the
cold water supply line.
Size the expansion tank to 10% of the water heater’s
capacity.
Always check with the manufacturer of the expansion
tank for sizing.
Engineering Manual
HAIR SALONS
BARBER SHOPS
The size of water heating equipment for a hair salon is
based on the number of basins used. Because most hot
water is used for washing hair, assume each station or
chair uses 12 gallons of hot water per hour based on each
shampoo lasting five to six minutes with a maximum of
four shampoos per hour per basin. If in doubt, refer to
Table 12 below.
Although less hot water is used to wash men’s hair than
women’s, more high temperature water is used for hot
towel applications during a shave. Use the same calculations and table as for hair salons.
TABLE 12
Most car washes use 110OF water to protect auto finishes, although slightly hotter water may be used to clean
tires. A storage tank is recommended and should be set
to the highest temperature required for the system. If
wheels and tires are washed with water power, storage
temperatures can range from 160OF to 180OF and mixed
with cold water.
Hair Salon Sizing
CAR WASHES
Caution: In cold climates, higher temperature water
delivered under pressure will vaporize and turn to steam
before reaching the vehicle. In northern climate winter,
ice removal can be accelerated by pre-rinsing the vehicle
with 120OF water.
Important:
The water heater must be supplied with fresh, outside
air and the boiler room door must be kept closed to
protect the heater from detergent fumes and aromatic
car “freshener” fumes. When mixed with combustion
products these fumes will inhibit good combustion and
can corrode a heater from the outside in.
Heater size is based on the number of stations/chairs,
with incoming water at 40OF and delivered temperature
at 140OF.
PLACES OF WORSHIP
Sizing is based on a 100oF rise in water temperature.
For a lower rise, multiply the number of stations/chairs
by the appropriate factor before determining the water
heater requirement.
Hot water requirements for places of worship will be
determined by the largest use, usually food preparation
and/or dish washing. If the building is equipped with a
machine dishwasher, the hot water requirement will be
found in Table 17, pages 25 - 27. If the building does not
have a machine dishwasher, base the requirement on two
gallons of hot water per person per meal served.
Example: For a 90oF rise in water temperature, multiply
the number of stations by .90. For an 80oF rise, multiply
the number of stations by .80.
Example: The building has five showers, each rated at 4
GPH flow, 10-minute use; six sinks; and a 2-E Blakeslee
dishwasher.
Washing machines for laundry should be sized according
to the self-service laundry section on page 25.
General Purpose Water:
Important:
Showers: 5 x 4 x 10 = . .........200 gallons
Corrosive products such as hair spray must be kept
away from water heating equipment. When mixed with
combustion products, such products can become very
aggressive and may actually corrode the heater from the
outside in.
Sinks: 6 x 5 =...........................30 gallons
TOTAL REQUIREMENT.........230 gallons
(may be accomplished using storage)
Make sure that ample fresh outside air is supplied to
the heater and that the boiler room door is always
closed off from aromatic sprays.
Engineering Manual
1
Food Service (from Table 17,
2-E Blakeslee dishwasher, 140OF general purpose; 180OF rinse
water, 288 gallons (pre-rinse: 180 gallons)
Food service (the largest requirement) will also be adequate for
shower and sink use, as use normally occurs at other times.
Use two Bock Model EZ100-199 as preheaters and a Model
EZ75-135 as a 180OF booster, or two Model 241E or 241PG with
a 71E or 71PG as a booster.
Without a machine dishwasher, the requirements are:
Showers, 5 x 4 x 10 = ............................................ 200 gallons
Sinks, 6 x 5 = ...............................................................30 gallons
Food service, 250 x 1/2 = .................................... 125 gallons
(1/2 gallon per person per meal)
Showers (the largest requirement) will also be adequate for
food service use, as use normally occurs at other times.
Use one Bock Model 75W-300SD, one 361E, one 361PG or one
118C-54 electric.
The application for a baptistry tank is similar to a swimming
or pump and the tank is drained between baptismal services.
The desired temperature is usually 80OF to 100OF but may vary.
Refer to the Swimming Pool section of this manual on page __
for sizing information.
Sizing by individual hot water requirements is recommended, rather than sizing by the number of students. It
classifies hot water requirements into three categories:
1. General purpose use
2. Cafeteria use
Use the food service section of this manual for school
cafeteria sizing.
3. Gymnasium shower use
A. Schools with showers used only for gym class
have relatively stable hot water requirements and
are used about 10 minutes per hour with a 50-minute recovery time between shower intervals. Sink
hot water requirements are typically low. Size these
applications by the number of shower heads to be
serviced and their flow rates.
B. Schools with moderate after-school use, such
as basketball practice and wrestling require longer
shower periods. Size for 20 minutes of continuous
shower flow.
C. Schools with heavy after-school use, such as
football practice and larger athletic events should
be sized for a 30-minute shower period and long
recovery time. A water heating system with a large
external storage tank can be used.
Gymnasium Unit Method Sizing
To determine the sizing for school gymnasium use, use
the following factors:
SCHOOLS
Because water heating requirements may use between
5% and 15% of the total energy consumed in a school,
proper sizing with efficient systems is very important.
Normally, efficient systems follow these principles:
1. Schools may have several hot water requirements
such as the gymnasium, cafeteria, clean-up and general purpose use. Separate water systems should be
used for each application, with the system located as
closely as possible to the end use to avoid long pipe
runs of hot water lines.
2. Insulate all hot water lines and storage vessels.
3. The thermostat settings should be lowered to 120OF
on water heaters used for general purposes and
clean-up.
4. Use booster heaters for cafeteria applications requiring
180OF water for machine dishwashers, but heat only
the water used for the sanitizing rinse.
Method of Sizing
There are two methods of sizing the hot water requirements of schools. The first is more exacting and will
provide a more energy-efficient system by using a
separate system for each requirement. The second is
if a single system is used for all requirements and there
are not extraordinary hot water demands such as afterschool athletic use.
18 www.bockwaterheaters.com
1. Number of shower heads.
2. Flow rate of the shower heads. New facilities will have
shower heads at 2 1/2 GPM; older buildings may have
much larger shower heads.
3. Temperature rise – the required temperature of hot
water less the temperature of incoming cold water.
4. Type of use: light, moderate or heavy.
Example:
20 shower heads, 3 GPM flow rate, 20-minute usage
per shower head.
20 x 3 x 20 = 1,200 gallons per 20-minute shower
requirement
Five sinks: 5 GPM usage.
5 x 5 = 25 GPH sink requirement
Bradley Washfountain: One 36-inch full-size 4 GPM flow
rate, 10 minute usage per hour.
4 x 10 = 40 gallons per 10-minute washfountain
requirement
TOTAL REQUIREMENTS:
1,200 + 25 + 40 = 1,265 gallons per 20-minute demand period
For this requirement, use one Bock Model 250-800 heater
with a 1,000-gallon storage tank. A single 250 will provide
527 gallons of hot water in 20 minutes at 90OF rise. The
additional 738 gallons are obtained from the 75% usable
storage in the 1,000-gallon storage tank.
Engineering Manual
Caution: For peak demands beyond normal use go to
larger storage.
Sink: 5 GPH usage.
4 x 5 = 20 gallons
For schools with swimming pools see the Swimming Pool
sizing section of this manual, page 27.
Slop sink: 20 GPH usage.
1 x 20 = 20 gallons
TOTAL USAGE:
70 + 20 + 20 = 110 gallons for 10-minute demand
INDUSTRIAL PLANTS
For this requirement use one Bock Model 241E or 241PG.
Refer to Tables 33 - 50, pages 58 - 75.
In small industrial plants all hot water needs can be supplied from a central installation.
Example, Large Plant
For better economy and service in larger plants, hot water
should be provided form individual installations at each
use location.
To determine industrial hot water requirements, group
the outlets first. If a central location is advisable, the hot
water load for all uses should be totaled and equipment
sized accordingly.
If individual locations at points of use is more advisable,
size each area’s requirements separately.
General purpose hot water for showers and Bradley
Washfountains should be based on 100% flow for 10
minutes (see Table 13, page 21).
Hot water for sinks and slop sinks is based on gallons
per hour (see Table 12, page 18).
For special applications such as washing, cleaning or
product processing, rate of flow times length of use
should be determined to give the total requirement. Using this total, Tables 33 - 50, pages 58 - 75 can be used
to size the water heater(s).
Example, Small Plant
A small industrial plant has one 54-inch Bradley Washfountain, four sinks and one slop sink.
Washfountain: 7 GPM flow rate for 10 minutes usage.
7 x 10 = 70 gallons
A large industrial plant has two 54-inch Bradley Washfountains and eight shower heads.
Shower heads: eight, each with 2.5 GPM flow rate, 10minute usage.
8 x 2.5 x 10 = 200 gallons per 10-minute usage
Bradley Washfountains: Two 54-inch washfountains, 7
GPM flow rate, 10-minute usage each.
2 x 7 x 10 = 140 gallons per 10-minute usage.
TOTAL USAGE:
200 + 140 = 340 gallons in 10 minutes.
Use two 541PG or 541E water heaters manifolded.
DAIRY BARNS
Most dairy barn applications require 180OF water for
sterilizing procedures. A large volume of water may be
required in a short time span so a storage tank should
be used. Where a Bock is replacing an existing electric
water heater, if the tank is in good condition it can be
used for storage.
Note: The standard operating controls on models 51E/PG
and 71E/PG are not designed for this application and
must be ordered from the factory equipped to provide
180OF water. Bock 30- and 40-gallon units cannot be
used in this application.
CARE CENTERS, DORMS, OFFICE BUILDINGS, CLUBS
When referring to relevant tables, remember that there
are additional considerations in determining the hot water
needs for each of the following installations:
Assisted Living Facilities
Water heater sizing in this section addresses the hot water necessary for baths, showers, sinks, laundry, general
cleaning and kitchen use. 180OF water for machine dishwashing should be provided by a separate booster heater.
The ASHRAE Guide indicates the need for 4.5 gallons of
hot water per bed per maximum hour and 30 gallons per
bed per day. Use caution in determining requirements.
Bock highly recommends the installation of anti-scald
or mixing valves to maintain 120OF water – water temperatures in excess of 120OF can cause scalding, serious
injury or death.
Engineering Manual
Office Buildings
Sizing is based on hot water requirements for cleaning
and lavatory use of occupants and visitors. Food service should be sized separately according to the Food
Service section of this manual on page 23. Reasonable
fuel economy can be achieved through the use of a time
clock (a Paragon or the equivalent) that shuts off the water
heater on weekends.
Dormitories
Food service is not included in dormitory sizing and must
be considered separately. The hot water consumption at
a dorm is based on a one-hour peak demand.
19
Country Clubs and Health Clubs
... TABLE 13 continued
Country club use is similar to school gymnasiums, except that such clubs have their heaviest demand during
weekends and summer months. To size for clubs, refer
to the school gymnasium format, page 19.
Sizing for Dormitories
100% RECOVERY AND NO EXTRA STORAGE AT 70OF
NO. OF NO. OF
MEN WOMEN
Restaurants at clubs should be sized using Tables 16 and
17. Size for swimming pools using the Swimming Pool
guide on page 27.
TABLE 13
NO. OF
MEN
NO. OF
WOMEN
PEAK
LOADS
10
50 GPH
32E
15
75 GPH
25
20
30
15
40
OIL
POWER
MODEL GAS MODEL
ATMO. GAS
MODEL
ELECT.
MODEL
32PG
EZ75-135
82C- 15
32E
32PG
EZ75-135
82C- 18
100 GPH
32E
32PG
EZ75-135
82C-24
25
125 GPH
32E
32PG
EZ75-135
82C-36
30
150 GPH
51E
51PG
EZ75-135
82C-36
30
160 GPH
51E
51PG
EZ75-135
82C-45
ELECT.
MODEL
35
175 GPH
51E
51PG
EZ75-135
82C-45
45
35
180 GPH
51E
51PG
EZ75-135
82C-45
50
40
200 GPH
51E
51PG
EZ75-135
82C-45
45
225 GPH
71E
71PG
80W- 180SD
82C-54
50
250 GPH
72E
72PG
80W- 180SD
82C-54
55
275 GPH
72E
72PG
EZ80-156
---
60
300 GPH
72E
72PG
EZ100-199
---
65
325 GPH
241E
241PG
80W-250SD
---
70
350 GPH
241E
241PG
100W-250SD
---
75
375 GPH
241E
241PG
75W-300SD
---
80
400 GPH
241E
241PG
75W-300SD
---
85
425 GPH
241E
241PG
75W-300SD
---
112
90
450 GPH
361E
361PG
75W-300SD
or 66W-370SD
---
125
100
500 GPH
361E
361PG
80W-399SD
---
65
100% RECOVERY AND NO EXTRA STORAGE AT 70OF
OIL POWER
ATMO.GAS
MODEL GAS MODEL MODEL
40
55
Sizing for Dormitories
PEAK
LOADS
80
94
100
Table 13 continued in next column ...
TABLE 14
Hot Water Requirements for Fixtures and Machines
TYPE OF FIXTURE OR MACHINE
FLOW RATE
DEMAND
TEMPERATURE
BATHTUB 4 GPM 20 GPH 120OF to 110OF
SINK 3 GPM 5 GPH 120OF to 110OF
CIRCULAR WASH FOUNTAIN, 54” DIAMETER 7 GPM 70 GPH120OF to 110OF
3.5 GPM
35 GPH120OF to 110OF
SEMICIRCULAR WASH FOUNTAIN, 54” DIAMETER 5-IN-A-GROUP SHOWER 12.5 GPM 125 GPH 120OF to 110OF
3-IN-A-GROUP SHOWER 7.5 GPM 75 GPH 120OF to 110OF
5 GPM 50 GPH 120OF to 110OF
CORNER SHOWER CIRCULAR COLUMN SHOWER 12.5 GPM 125 GPH 120OF to 110OF
SEMI-CIRCULAR COLUMN SHOWER 75 GPH 120OF to 110OF
HAIR SALON FIXTURE/STATION 3 GPM 12 GPH 120OF to 110OF
BARBER SHOP LAVATORY 3 GPM 5 GPH 120OF to 110OF
RESTAURANT AUTOMATIC DISHWASHER 4 GPM 7 GPH 140OF
MOP SINK 3 GPM 15 GPH 140OF
BAR SINK 3 GPM 25 GPH 140OF
SINGLE POT SINK 4 GPM 25 GPH 140OF
DOUBLE POT SINK 4 GPM 50 GPH 140OF
TRIPLE POT SINK 4 GPM 75 GPH 140OF
VEGETABLE SINK 4 GPM 40 GPH 140OF
HANDSPRAY DISH PRE-RINSE 4 GPM 45 GPH 140OF
BRUSH-TYPE DISH PRE-RINSE 3 GPM 180 GPH 140OF
CONVEYOR DISH PRE-RINSE * 4 GPM 240 GPH 140OF
AUTOMATIC 9 LB. TO 12 LB. CLOTHES WASHER 5 GPM 36 GPH 160OF
STATIONARY RACK DISHWASHING MACHINE
CONVEYOR DISHWASHING MACHINE
7.5 GPM SEE FOOD SERVICE SECTION
140OF TO 180OF
SEE FOOD SERVICE SECTION
140OF TO 180OF
* May be built into dishwasher; frequently used as separate appliance
CAUTION: 180OF water generated by the heating system should be connected only to the rinse inlet of the dishwasher and possibly to
the wash tank fill. The pre-wash or scrapping section of the dishwashing operation and the general purpose sinks throughout the kitchen
should not receive any water hotter than 140OF unless local health regulations require one pot sink to be serviced by 180OF water. If so,
WARNING! 180OF water can cause scalding, serious burns and death!
the faucet should be clearly marked.
20 www.bockwaterheaters.com
Engineering Manual
TABLE 15
Shower Head by Manufacturer’s Model
NOTE: Federal law limits all new shower heads to 2.5 gallons per minute
MANUFACTURER
MODEL
GPM (105oF)
NORMAL
FLOW
MANUFACTURER
MODEL
MAGIC FOUNTAIN
MILWAUKEE FAUCET
MOEN
5.5
5.5
3.0
CHASE BRASS
188.355
10.0
44PB 110DPB
ALSONS
605 BOYD CADET SPS 1411
HERITAGE N 1301-03 VICTOR R 1311-13 AMERICAN
STANDARD
17T-8610 BRIGGS
T-8612 CENTRAL BRASS
3033 CHICAGO FAUCET
CITADEL
CRANE
DEARBORN BRASS
DELTA
2.0
2.0
2.75
9.5
2.5
9.3
5.5
620 FC Brown 620-B 2.75
8.0
C2209 2.75
9-221 9-238 9-250 9-251 ECONOMY 8-2564 ECONOMY 9-221 RAINBEAU 9-238 RAIINBEAU 8-2556 CAPRI 8-2550 3.0
5.5
8.0
8.0
3.5
3.0
5.5
5.5
8.0
DEARBORN 7.5
ALL 2.75
2S
3S
4S
DOLE VALVE
2-1S 3-1S 1 3
2.0
3.0
4.0
2.0
2.0
NOT RATED
NOT RATED
DUURMEER
NO. 19 NO. 60 5.6
9.1
E-9115 6.0
ELJER
FEDERAL HUBER
FEDERAL HUBER NOT RATED
GYRO BRASS
GYRO-MANY STREAM NOT RATED
HARVEY MACHINE
HARCRAFT B-2 8.0
INDIANA BRASS
INDIANA BRASS 7.5
K-7325 K-7332 K-7350 K-7370 NOT RATED
NOT RATED
7.0
7.5
HO1 HO2
3.0
2.0
KOHLER
LEONARD
LOGAN
Engineering
Manual
C-10-2S
2.0
500 SERIES
2.0
WIZARD STD. HEAD 2.4 to 3.5
WIZARD LOW PRES. HEAD 3.5 to 6.0
GPM (105oF)
NORMAL
FLOW
DIAPHRAGM MAGIC FOUNTAIN 2.8
3.0
K-3682 A CATALINA PREMIER 3.5
3.5
3.5
3905 3900 A 2.75
2.75
NOLAND
CITATION NO. 1 DELRIN
4.0
ONDINE
28446 2.75
B-1447 B-1427 HYDRO JET PRESTO
4.0
5.0
4.2
5.0
REPCAL BRASS
1466
SCOVILLE
7.0
HOMART 2055 10.5
HOMART 2080 5.5
HOMART 2091 NOT RATED
SEARS
NO. 1 STANDARD ACT-O-MATIC
NO. 2 FINE SPRAY ACT-O-MATIC
NO. 3 NEEDLE SPRAY
ACT-O-MATIC
ACT-O-MATIC AC-10 4.5
1-S-2240 2-S-2240 3-S-2240 S-2250 ANY STREAM NO. 1
S-2250 ANY STREAM NO. 2
SPEAKMAN
S-2250 ANY STREAM NO. 3
SS-2250 ANY STREAM MODEL 1
SS-2250 ANY STREAM MODEL 2
SS-2250 ANY STREAM MODEL 3
4.5
4.5
2.5
9.0
S-2245 STERLING FAUCET
S-194 15-031 4.5
6.0
6.0
SURE FLOW BRASS
NO. 35 NO. 36 3.0
4.5
SYMMONS
INDUSTRIES
CLEAR-FLO
SUPER-FLO 3.5 to 7.0
4.0 to 9.0
UNIVERSAL RUNDLE
WRIGHTWAY
SLOAN VALVE
3.6
3.0
5.5
7.0
6.0
8.0
6.0
4.0
8-1245
4.0
BUBBLE STREAM 4.0
21
FOOD SERVICE ESTABLISHMENTS
When supplying hot water for food service establishments
the water heating system must be adequate to meet the
maximum probable demand, regardless of whether the
peak period exists for just one hour or much longer. The
system must be capable of supplying hot water at two
temperatures: 140OF for general purpose water and 180OF
for sanitizing water.
Sanitizing water must be maintained at 180OF or higher
for the sanitizing rinse of all tableware in restaurants and
other food service establishments to insure satisfactory
bacteria reduction and to promote rapid air drying. Most
health department codes specify a 180OF rinse of tableware. The amount of hot water to be supplied will be
governed by meal-serving capacity and the dishwashing
equipment being used.
As food service establishments vary considerably in size
and dish washing methods range from individual hand
washing to the largest continuous-feed automatic dishwashing machines, hot water requirements range from a
residential water heater to the largest commercial units.
Example: A restaurant serving 200 to 400
meals daily. A Blakeslee Model l-ER dishwasher is specified.
Refer to Table 17 to find the manufacturer of this specified
machine and the Bock water heating equipment required
to furnish 180OF water. Bock models required to boost
the water temperature from 140OF to 180OF are found in
Table 17, Section A (if 140OF water is available).
To determine the amount of 140OF general purpose
water necessary for the restaurant, refer to Table 17 and
size the additional load for the pre-scrapper, pot sinks,
etc. If possible, use one water heater to supply all the
140OF general purpose water, plus the 140OF water to be
furnished to the dishwasher. Water temperature will be
boosted to 180OF by a second water heater. To size, total
the general purpose water (for sinks, pot washers, cleaning, etc.) from Table 17 and add this to the total amount of
180OF water required for the specific dishwasher shown
in Table 17, Section A.
Additionally, peak demands of dishwashing machines
also vary widely and are not generally a consistent factor
of the number of meals served during any given period.
Table 17 has been formulated to help the architect,
engineer, builder or installer to quickly determine the
appropriate Bock water heater according to the type of
dishwashing being used.
Example: Small installations
Machine Dishwashing
Tray-type dishwasher sizing can be estimated assuming
that the average 60-tray single tank will require 90 GPH
of 180OF water. Fifty trays will require 75 GPH of 180OF
water, 40 trays 60 GPH. Approximately 1 1/2 times the
number of trays per hour determines the gallons of 180OF
water needed per hour.
To make the selection of water heating equipment as
simple as possible, Table 17, pages 25-27, lists various
models of dishwashing machines and the recommended
Bock water heaters needed to meet requirements. Similar requirements of makes not listed in the table can be
compared to like requirements that are listed.
Installation Issues
1. A flow pressure of 20 PSI is ideal for a satisfactory rinse.
A flow pressure above 20 PSI would cause atomization
of the rinse spray and unsatisfactory flushing of washing solution residue from the dishes and tableware.
Temperature of the dishes would not be maintained
at a level capable of destroying harmful bacteria. An
uncontrolled rate of flow would also waste hot water
and the heating system would probably be incapable
of meeting the unanticipated demand for hot water
or maintaining proper temperature. The installation of
pressure regulators is strongly advised when the line
pressure (flowing) exceeds 20 PSI.
2. The booster providing 180OF water should be located
as close to the dishwasher as possible to minimize heat
loss in the pipe run, thereby assuring 180OF water at
the dishwasher. All hot water piping should be insulated
to a 3/4” minimum.
22 www.bockwaterheaters.com
It may be desirable to select one water heater for all 180OF
requirements and install a mixing valve to supply 140OF
water. (Recirculating, holds temperature more steady,
could be on a manual switch.)
Tray-type dishwasher
TABLE 16
Water Mixing Valves
Percentage of hot water automatically mixed with cold
water to obtain the desired outlet temperature.
Temp.
COLD WATER SUPPLY
of
mixed 40OF 50OF 60OF 70OF 80OF 90OF 100OF
water
180OF
—
—
—
—
—
—
—
170OF
92.8
92.3
91.7
90.9
90
88.8
87.5
160OF
86
85
83.3
82
80
78
75
150OF
78.5
76
75
73
70
67
62.5
140OF
71
69
67
64
60
55.5
50
130OF
65
61.5
58
54.5
50
44
37.5
120OF
57
54
50
45
40
33
25
110OF
50
46
41.5
35
30
21
12
100OF
43
38
33
27
20
11
11
Engineering Manual
TABLE 17
MACHINE DISHWASHING REQUIREMENTS
MAKE & MODEL NUMBER
180°F
WATER
REQUIRED
GPH
A BOCK WATER HEAER MODEL TO BOOST
B BOCK WATER HEAER MODEL TO
EXISTING 140°F WATER TO 180°F
SUPPLY 180°F AT 140°F RISE
OIL
ELEC.
GAS
POWER
GAS
OIL
ELEC.
GAS
POWER
GAS
ADAMATION
10-20
234
1-51E
1-24KW
1-EZ75-135
1-51PG
1-361E
2-40KW
1-100W-199SD
1-361PG
CA-4 SUPER WASH
288
1-51E
1-30KW
1-EZ75-135
1-51PG
2-73E
2-54KW
1-100W-300SD
2-73PG
SL-1390
294
1-51E
1-30KW
1-EZ75-135
1-51PG
2-73E
2-54KW
1-65W-370SD
2-73PG
CSL-1390
294
1-51E
1-30KW
1-EZ75-135
1-51PG
2-73E
2-54KW
1-65W-370SD
2-73PG
CA,CA-1
417
1-72E
1-45KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-80W-505SD
2-361PG
CA-2, CA-4
417
1-72E
1-45KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-80W-505SD
2-361PG
SL-3, CA2M
420
1-72E
1-45KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-80W-505SD
2-361PG
AHC, L90-3DW, WC, ET-AH
44
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
AC, ETA
51
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
AH, L72-3DW, WC
55
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
HT-25
61
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
A, AFC, AFC-3D, AF-3D (10SEC), L603DW, WC, AF, AFC-3D, AF-3D (90 SEC)
68
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
AF-B
88
1-51E
1-30KW
1-EZ75-135
1-51PG
2-73E
2-54KW
1-EZ75-135
2-73PG
5AH
101
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
1-40KW
1-EZ80-156
1-72PG
ADC-44
120
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
2-40KW
1-EZ80-156
1-72PG
5
126
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
2-40KW
1-EZ80-156
1-72PG
5AG
168
1-51E
1-24KW
1-EZ80-156
1-51PG
1-72E
2-40KW
1-EZ80-156
1-72PG
AMERICAN DISH SERVICE
BLAKESLEE
UC-21, D-9
35
1-51E
1-15KW
1-EZ75-135
1-51PG
1-32E
1-24KW
1-EZ75-135
1-51PG
D-8, D8-LT
72
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-27KW
1-EZ75-135
1-51PG
117
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
2-40KW
1-EZ80-156
1-72PG
A-7, B-7, BC7, D7, DC7
DOUBLE D-8, DOUBLE D8-LT, R-L, R-M,
R-PL, R-PM, FA-L, FA-M, FA-PL, FA-PM
144
RA-L, RA-M, RA-PL, RA-PM
282
1-51E
1-30KW
1-EZ75-135
1-51PG
2-73E
2-54KW
1-100W-300SD
2-73PG
F-L, F-M, F-PL, F-PM, R-CC, R-EE, R-LL,
R-MM
282
1-51E
1-30KW
1-EZ75-135
1-51PG
2-73E
2-54KW
1-100W-300SD
2-73PG
288
1-51E
1-30KW
1-EZ75-135
1-51PG
2-73PG
2-54KW
1-100W-300SD
2-73PG
2-E, 2-ER, 2-L, 2-LR, 2-M, 2-MR, 3-E, 3L, 3-M, F2-E, F2-ER, F2-L, FA2-L, F2-LR,
FA2-LR, F2-M, FA2-M, F2-MR, FA2-MR,
F3-E, FA3-E, F3-L, FA3-L, F3-M, FA3-M
288
1-51E
1-30KW
1-EZ75-135
1-51PG
2-73E
2-54KW
1-100W-300SD
2-73PG
XF-LLL, XF-XMM
360
1-72E
1-40KW
1-EZ80-156
1-72PG
2-361E
3-40KW
1-80W-450SD
1-E, 1-ER, 1-L, L-LR, 1-M, 1-MR, F1-E,
F1-ER, F1-L, F1-R, F1-M, F1-MR, XFA2E, XF2-ER, XFA2-ER, XF2-L, XFA2-L,
XF2-LR, FA2-LR, XF2-M, XFA2-M, XF2MR, XFA2-MR, XF3-E, XFA3-E, XF3-L,
XFA3-L, XF3-M, XFA3-M
420
1-72E
1-45KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-150G-400
3-361PG
XF1-E, XFA1-E, XF1-ER, XFA1-ER, XF1L, XFA1-L, XF1-LR, XFA1-LR, XF1-M,
XFA1-M, XF1-MR, XFA1-MR
720
1-361E
2-36KW
2-EZ75-135
1-361PG
3-361E
5-54KW
1-200G-850
3-361PG
XF-MMM, XF-L, XF-M, XF-PL, XF-PM
720
1-361E
2-36KW
2-EZ75-135
1-361PG
3-361E
5-54KW
1-200G-850
3-361PG
U-HB, UH1
33
151E
1-15KW
1-EZ75-135
1-51PG
1-32E
1-24KW
1-EZ75-135
1-51PG
TUW
37
151E
1-15KW
1-EZ75-135
1-51PG
1-32E
1-24KW
1-EZ75-135
1-51PG
U-LD
44
151E
1-15KW
1-EZ75-135
1-51PG
1-32E
1-24KW
1-EZ75-135
1-51PG
D-HB, D-H1, D-LF
66
151E
1-15KW
1-EZ75-135
1-51PG
1-32E
1-24KW
1-EZ75-135
1-51PG
T-6A, T-7A, T-7AC
74
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-27KW
1-EZ75-135
1-51PG
1-KAB, 1-KACB
107
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
1-40KW
1-EZ80-156
1-72PG
44WS, 66WS, 64KB, 64-KPRB
130
151E
1-15KW
1-EZ75-135
1-51PG
1-51E
——
1-EZ75-135
1-51PG
40K Series, 60K Series, PR-96, PR-120
282
1-51E
1-30KW
1-EZ75-135
1-51PG
1-73E
2-54KW
1-100W-300SD
64K Series
348
1-71E
1-36KW
1-EZ80-156
1-71PG
1-361E
3-40KW
1-80W-425SD
20K Series, 30K Series
416
1-72E
1-40KW
1-EZ80-156
1-72PG
1-150-400E
3-54KW
1-150G-400
UC Series
426
1-72E
1-45KW
1-EZ80-156
1-72PG
3-361E
3-54KW
1-80W-505SD
1-EZ75-135
FA-EE, FA-LL, FA-MM, RA-EE, RA-LL,
RA-MM, R-PCC, R-PEE, R-PLL, R-PM,
FA-PEE, RA-PLL, RA-PMM, RA-PEE, RAPLL, RA-PMM, R-EEE, R-LLL, R-MMM,
FA-333, FA-LLL, FA-MMM, RA-EEE,
RA-LLL, RA-MMM, F-EE, F-LL, F-MM,
F-PEE, F-PLL, F-PMM, F-EEE, F-LLL,
F-MMM, XF-EE, XF-LL, XF-MM, XF-PEE,
XF-PLL, XF-PMM
——
CHAMPION
Engineering Manual
2-73PG
——
——
2-361PG
23
TABLE 17
MACHINE DISHWASHING REQUIREMENTS
MAKE & MODEL NUMBER
180°F
WATER
REQUIRED
GPH
A BOCK WATER HEAER MODEL TO BOOST
B BOCK WATER HEAER MODEL TO
EXISTING 140°F WATER TO 180°F
OIL
ELEC.
GAS
SUPPLY 180°F AT 140°F RISE
POWER
GAS
OIL
ELEC.
GAS
POWER
GAS
CHAMPION, cont.
40KB, 4-PKRB, 44KB, 44-KPRB,
KL-44, KL-66
300
1-51E
1-30KW
1-EZ75-135
1-51PG
1-361E
2-54KW
1-65W-370SD
——
54-KB, 54-KBRP
325
1-51E
1-30KW
1-EZ75-135
1-51PG
1-361E
2-54KW
1-65W-370SD
——
UC-C
336
1-51E
1-30KW
1-EZ75-135
1-51PG
1-361E
2-54KW
1-65W-370SD
UC-CW
425
1-72E
1-45KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-65W-625SD
W-6
852
2-71E
——
1-65W-625SD
——
2-150E-400
——
1-250G-1000
——
2-361PG
——
FOOD EQUIPMENT DIVISIONMcGRAW-EDISON
TKM-20
60
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
TKM-27, TKMC-27
116
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
1-40KW
1-EZ80-156
2-72PG
TKM-215 thru TKM-324
414
1-72E
1-40KW
1-EZ80-156
72PG
2-361E
3-54KW
1-80W-505SD
2-361PG
TKM-44, TKM-66R
420
1-72E
1-45KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-80W-505SD
2-361PG
TKM-64 thru TKM-115
624
1-241E
2-30KW
2-EZ75-135
1-241PG
1-200E-650
4-54KW
1-150G-800
——
3T-30B, SK-10B, SK-30B
77
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-27KW
1-EZ75-135
1-51PG
50-20, SK Series, 50SMT
103
1-51E
1-15KW
1-EZ75-135
1-51PG
1-71E
1-36KW
1-EZ80-156
1-71PG
115-20, 165-20, 225-20, 275-20
282
1-51E
1-30KW
1-EZ75-135
1-51PG
1-361E
2-54KW
1-100W-300SD
2-361PG
SS64B, SS80B, SS86B, SS102B,
SS100B, SS116B
300
1-51E
1-30KW
1-EZ75-135
1-51PG
1-361E
2-54KW
1-165W-370SD
1-361PG
SS40B, SS48B, SS62B, SS70B, SS76B,
SS84B
426
1-72E
1-45KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-200G-450
2-361PG
WM Series
68
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
UM Series
70
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
AM Series, LM-3T3
122
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
1-45KW
1-EZ80-156
1-72PG
C-64, CRS-86, FR-64, FRC-64, CPW-100,
C-81, CRS-103, FR-81, FRC-81,
CWS-103, CPW-117, CS-100, CS-117
282
1-51E
1-30KW
1-EZ75-135
1-51PG
1-361E
2-54KW
1-100W-300SD
1-361PG
FT-200, 300 and 500 Series
348
1-71E
1-36KW
1-EZ80-156
1-71PG
1-361E
3-40KW
1-80W-450SD
C-44, CRS-66, CWS-66, CPW-80,
C-54CRS-76, FR-54, FRC-54, CWS-76,
CPW-90, FT-400 Series
450
1-72E
1-45KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-200G-450
2-361PG
45SA5-F1, 45SA5-F2
36
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
Ensign 40-2, 45SA
61
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
Ensign 40-2, Ensign 60-2oM-NSU, 8520M, 135-20M-NSU, 185-20M-NSU
61
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
Commander 18-4, Commander 18-4C,
Commander 18-4H
65
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
1-51PG
1-51PG
GENERAL ELECTRIC FOOD SVC. EQPT.
HOBART
——
INSINGER
70
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
Commodore 15, commander 18, 50SA
120
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
1-45KW
1-EZ80-135
7-72PG
Admiral 44, Admiral 66-3
210
1-51E
1-24KW
1-EZ75-135
1-51PG
1-361E
2-40KW
1-200G-180
1-361PG
250-20M-NSU
220
1-51E
1-24KW
1-EZ75-135
1-51PG
1-361E
2-40KW
1-EZ100-199
1-361PG
Speeder 65, Speeder 86-3
222
1-51E
1-24KW
1-EZ75-135
1-51PG
1-361E
2-40KW
1-200G-180
1-361PG
Clipper (all)
222
1-51E
1-24KW
1-EZ75-135
1-51PG
1-361E
2-40KW
1-100G-180SD
1-361PG
Century 14
228
1-51E
1-24KW
1-EZ75-135
1-51PG
1-361E
2-40KW
1-100W-250SD
1-361PG
Speeder 5, Speeder 86-1, Clipper 9,
Clipper 96-1, Super 8, Super 106-1,
Super F-106-1, Master 165-DA-3, 60-DA,
85-DA, 85-DA7, 116DA, 135DA, 165-DA,
185-DA, 225-DA, 250-DA, 275-DA
300
1-51E
1-30KW
1-EZ75-135
1-51PG
1-361E
2-54KW
1-65W-370SD
——
Super 106-2
300
1-51E
1-30KW
1-EZ75-135
1-51PG
1-361E
2-54KW
1-65W-370SD
——
Defender (all)
306
1-51E
1-30KW
1-EZ75-135
1-51PG
1-361E
2-54KW
1-65W-370SD
——
Clipper RC-16 FPW thru RC-21 FPW,
Clipper RC16 RPW thru RC-21 RPW,
Master RC-18 thru RC-33, Master RC-18
FPW thru RC33 FPW, Master RC-18
RPW thru Master RC-33 RPW
312
1-51E
1-36KW
1-EZ75-135
1-51PG
1-361E
2-54KW
1-65W-370SD
——
Master (all)
360
1-72E
1-40KW
1-EZ80-156
1-72PG
2-361E
3-40KW
1-80W-425SD
——
Admiral 120-5, Admiral 120-7, Admiral
60-2, Admiral 66-2
416
1-72E
1-40KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-80W-505SD
2-361PG
MiniFlite S-9 thru S-12, Admiral RC-12
FPW thru RC-20 RPW
480
1-73E
1-54KW
1-EZ100-199
1-73PG
2-361E
3-54KW
1-200G-450
2-361PG
CA-3
24 www.bockwaterheaters.com
Engineering Manual
TABLE 17
MACHINE DISHWASHING REQUIREMENTS
MAKE & MODEL NUMBER
180°F
WATER
REQUIRED
GPH
A BOCK WATER HEAER MODEL TO BOOST
B BOCK WATER HEAER MODEL TO
EXISTING 140°F WATER TO 180°F
POWER
GAS
SUPPLY 180°F AT 140°F RISE
GAS
1-73E
1-54KW
1-EZ100-199
1-73PG
2-361E
3-54KW
1-65W-625SD
2-361PG
10A, 10AB, 10APRB, 10APRB-H, 50APR,
50APRB, JV-24A, JV-24AF, JB-24B,
JV-24BF
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
JL-100A, JL100G, JL-100, JL100PRB,
JL-100PR
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-72E
1-EZ80-156
1-72PG
J-44, SJF-44, 39C, 44-C
1-72E
1-40KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-80W-505SD
2-361PG
4-A, DJF-48, 4-ARD, 6-A, DJF-60, 6-ARD,
ROTO DR JR, DJF-64, 1323 thru 2673
(Suffix “B” models have integral booster)
1-51E
1-30KW
1-EZ75-135
1-51PG
2-73E
2-54KW
1-EZ75-135
2-73PG
480
OIL
ELEC.
GAS
POWER
GAS
ELEC.
Clipper RC-16-EW-2 thru RC-31 RPWEW-2, Clipper RC-16 RPW-EW-3 thru
RC-31 PRW-EW-3, Master RC-18 RPWEW-3 thru RC-33 RPW-EW-3, Master
HRC-
OIL
JACKSON
JP-24 Series
26
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
24LT Series
29
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
200 Series
52
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
Temp Star, SDS
52
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
Conserver II
60
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
Conserver I
111
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
2-40KW
1-EZ80-156
1-72PG
10 Series
234
1-51E
1-24KW
1-EZ75-135
1-51PG
1-361E
2-40KW
1-100W-250SD
1-361PG
AJ-44, AJ-66, AJ-80 Vision Series
234
1-51E
1-24KW
1-EZ75-135
1-51PG
1-361E
2-40KW
1-100W-250SD
1-361PG
MOYER DIEBEL
501LT, 501HT
MD-18 Series
MH6-L, MH60
501HTN
37
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
MH6N
66
1-51E
1-15KW
1-EZ75-135
1-51PG
1-51E
1-24KW
1-EZ75-135
1-51PG
SF-1RA, SF-2RA, SF-2DRA, SDRA,
SD-2RA
103
1-51E
1-15KW
1-EZ75-135
1-51PG
1-71E
1-36KW
1-EZ80-156
1-51PG
SCT-44, SCT44-10, SCT-76S, SCT-76SC,
SC-1-SCT-44, SC-1-SCT-44-10, SC-1SCT-54, SC-2-4, SC-6-4, SC-1-2-4,
SC-1-6-4, SC-5-6-4
417
1-51E
1-40KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-80W-505SD
1-51PG
SCT-64, SCT-76, SCT-80, SCT-94, SCT94S, SCT-95SC, SCT-108S, SCT-108SC,
SCT-108, SCT-120, SCT-120SM, SCT120S, SCT-120SC, SCT-05SM, SC-1SCT-64, SC-1, SC-76, SCT-80, SCT-94,
SCT-108, SCT-120, SC-5, SCT-64
277
1-51E
1-27KW
1-EZ75-135
1-51PG
1-241E
3-40KW
1-100W-300SD
2-51PG
SC-2-3-4, SC-6-3-4, SC-2-7-4, SCT-44,
SC-3-4, SCT-44-10SC-3-4, SCT-54SC-34, SC-1-2-7-4, SC-1-6-3-4, SC-5-2-3-4,
SC1-6-7-4, SC5-6-3-4, SC-5-2-7-4, SCT76S-SC-3-4, SCT-44SC-1-3-4, SCT-4410SC-1-3-4, SCT-54SC1-3-4
295
1-51E
1-30KW
1-EZ75-135
1-51PG
1-361E
3-54KW
1-65W370SD
1-361PG
SCT-76SM, STPC-15, STPEC-18, STPEC19, STPEC-19PS, STPEC-20, STPC-22,
STPEC-24, STPEC-24D, STPEC-26,
STPEC-26D
330
1-72E
1-36KW
1-EZ75-135
1-71PG
1-361E
2-54KW
1-65W-399SD
1-361PG
STPCW-15 thru STPCW-26
390
1-72E
1-40KW
1-EZ80-156
1-72PG
2-361E
3-40KW
1-80W-505SD
——
STPC-10, STPC-12HS, STPC-12PS
465
1-73E
1-54KW
1-EZ100-199
1-73PG
1-200E-450
4-54KW
1-200G-450
——
STPCW-10, STPCW-12HS, STPCW12PS, STPCW-15HS, STPCW-15PS
576
1-241E
2-30KW
____
1-241PG
1-150E-600
4-54KW
1-200G-600
——
CU-16BTA, R-16BTA, 3D20T, CD20T
120
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
1-45KW
1-EZ80-156
——
A-44 thru A-54
480
1-73E
1-54KW
1-EZ100-199
1-73PG
2-361E
3-54KW
1-65W-625SD
——
A-64 thru A-98
390
1-72E
1-40KW
1-EZ80-156
1-72PG
2-361E
3-40LW
1-80W-505SD
——
CP-3 Series, HP-3 Series, CP-2 Series
420
1-72E
1-40KW
1-EZ80-156
1-72PG
2-361E
3-54KW
1-EZ100-199
——
AD-20 Series
102
1-51E
1-15KW
1-EZ75-135
1-51PG
1-72E
1-36KW
1-EZ80-156
——
AD-64, AD-80, PC-19, PC-26
300
1-51E
1-30KW
1-EZ75-156
1-51PG
2-51E
2-45KW
1-65W-370SD
——
AD-44, PC-12
480
1-73E
1-54KW
1-EZ100-199
1-73PG
2-361E
3-54KW
1-65W-625SD
——
STERO
VULCAN-HART
WELLS
Engineering Manual
25
SELF-SERVICE AND COMMERCIAL LAUNDRIES
Self-Service Laundries
Self-service laundries typically require 2 1/2 gallons of
water per pound of laundry, which should be adequate for
hot water storage plus a recovery capacity equal to the
hourly demand of automatic washing machines. Although
hot water demands will not be uniform, there may be times
when all machines would be in operation simultaneously
– most likely to occur on weekdays or at night.
This possible one-hour peak demand should always be
given serious consideration when sizing for self-service
laundry hot water requirements.
Bock uses a calculation of two cycles per hour. This number
– multiplied by the number of machines by the gallons of hot
water used by each machine – gives the amount of hot water
used per hour. This known GPH, along with temperature of
water required, will determine the capacity needed.
Consult manufacturers for sizes of machines. Hot water
requirements for a self-service laundry are determined
through the following steps:
1. From the rating plate on the machine or from the manufacturer’s literature, find hot water usage in GPH for
each automatic washer.
ber of high volume water heaters required to supply the
laundry’s probably hourly demand.
Example: Laundry with 30 washers
Each washer has a capacity of 26 GPH of 140º F water.
Laundry operates on one-hour peak demand.
Total Hourly Usage: 30 x 26 = 780 gallons @ 140º F
Using Tables 43-44, pages 68 - 69, Bock models E Z 8 0 - 1 5 6 ,
190PG, and 72E would satisfy demand. At a 90ºF rise, the
following sizing recommendations can be made:
1) (3)-EZ80-156 units can provide:
Recovery: 3 x 212 GPH = 636 GPH
Usable Storage: 3 x 80 gal. x 0.8 = 192 gal.
Total 1-hr delivery = 636 GPH + 192 gal. = 828 gallons
2) (3)-190PG units can provide:
Recovery: 3 x 191 GPH = 573 GPH
Usable Storage: 3 x 113 gal. x 0.8 = 271 gal.
Total 1-hr delivery = 573 GPH + 271 gal. = 844 gallons
3) (3)-72E units can provide:
Recovery: 3 x 212 GPH = 636 GPH
Usable Storage: 3 x 67 gal. x 0.8 = 161 gal.
Total 1-hr delivery = 636 GPH + 161 gal. = 797 gallons
A. Few self-service laundries use the pre-wash soak
cycle. This factor should be ascertained, however, and
the gallonage used in the soak cycle subtracted from
the unit rating.
Note : This formula is for average conditions which include
an occasional peak demand. When all machines are used
constantly, the preceding formula must be doubled (as suming a half-hour cycle per machine).
B. If the rating for each washer cannot be found, use
25 GPH for each unit (if one cycle per hour).
Commercial Laundries
2. Add together all the individual washer requirements for
the maximum hourly demand.
3. From Tables 33-50, pages 58 - 75, determine the num-
The best way to determine the cycle of hot water needs of
a commercial laundry is to contact the equipment manu facturer. If this cannot be done, assumed three gallons of
hot water per one pound of laundry with half the required
water being hot. Bock recommends 160 O F for this water.
SWIMMING POOLS, HOT TUBS AND BAPTISTRIES
Size a hot tub based on its gallon capacity. Obtain this quantity
from either the manufacturer or by using steps1 and 2 of the
Swimming Pool instruction section on page 28. Determine
how long it will take to fill the tub.
To determine the temperature rise, subtract the desired tem perature from the norm for the area.
With these known factors, size the water heater using Deliv erability Tables 33-50, pages 58 - 75. These tables show the
capability of different types of Bock water heaters for a given
length of time at a desired temperature.
Refer to Table 37-38, pages 62-63 to find the maximum delivery
in gallons (Use Tables 39-40, pages 64-65 for a 65 O F rise).
To use these tables, find the temperature rise, which depends
on water temperature norms for the geographical region:
Norther n Tier States – 45 O F to 55 O F
Central Tier States – 55 O F to 60 O F
Souther n Tier States – 65 O F to 75 O F
26 www.bockwaterheaters.com
Example: 125 O F water in a South Tier state. Result: 125 O F
minus 60 O F to 65 O F temperature rise.
Example: To fill a 120-gallonhot tub in 15 minutes, look down
the 15 MINUTE column to 120 gallons or higher. Then move
left across that space to find the correct Bock model water
heater. This example requires a 72PG, EZ80-156, or 72E. Use this
same method to size a baptistry.
Note: Aerated hot tubs have approximately 50% greater heat
loss than standard tubs. To maintain temperature, Bock rec ommends adding half of the total heat loss to the sizing and
increasing the input by 50%.
Engineering Manual
The first criterion is the maximum temperature rise in degrees Fahrenheit (OF), for initial heat-up (Delta T) to establish
the desired pool temperature. The temperature rise is determined by the known desired pool temperature and then
by the ambient air conditions at the time the pool water is
initially heated.
FIGURE 20: Piping Diagram
SWIMMING POOL MANIFOLD;
BOCK MODELS 32E, 51E
The second criterion is the time allowed for the initial heating
of the pool or spa water (for example; 24 or 48 hours).
The third criterion is the size of the swimming pool or spa.
The water heater must be sized large enough for initial
heat-up within the desired time frame.
From these criteria, calculate the hourly BTU input. BTUH
input is the basis used to find the correct Bock water heater
model. After the BTUH calculation has been determined,
refer to Tables 33-50, pages 58 - 75 to find the exact Bock
water heater to fit the requirements.
Steps to finding the BTU hourly input:
1. Cubic feet - length X width X average depth.
2. Gallons - cubic feet X 7.5.
3. Hourly BTU input = gallons X factor.
1 2
3/4” TEES
2 1 3/4” ELBOW
3
2
3/4” UNIONS
4 1 1 1/2” SHUTOFF VALVE
5
2 1 1/2” PIPES - “B”
6
4
3/4” SHORT NIPPLES (2”)
7 1 THERMOMETER
8 1 HONEYWELL L 4006 A CONTROL
9 1 CROSS TEE
A. Factor is found in Table 18, this page, by noting the
hours desired for heating the swimming pool or spa
water, plus the temperature rise.
B. To find the temperature rise, first decide the ideal
water temperature for the pool or spa, then subtract the
yearly average outdoor temperature for the month pool
heating will begin. Call the local weather station to find
the yearly average temperature for the area.
Example: Swimming pool is 40’ x 18’ x 5’ = 3600 cubic feet.
3600 X 7.5 = 27,000 gallon capacity. Need 48 hours to heat
swimming pool. Average water temperature at initial heat-up is
60OF. Desire 80OF water temperature in pool. 80 - (minus) 60 =
20OF rise. Factor = 5 (with 48 hours heating time and 20oF rise)
refer to Table 18. BTUH = 27,000 gallons X 5 = 135,000 BTUH
input. A Bock Model 5lPG or a 5lE would be appropriate for this
example. Refer to Tables 33-50, pages 58 - 75.
In a swimming pool or spa installation, the major consideration when using a storage-type water heater is the
prevention of condensation inside the unit.
Condensation is held to a minimum when the temperature in
the water heater is maintained above 120OF. To do this, use
a bypass, which will increase the life of the water heater tank
and combustion chamber appreciably (water temperature
higher than 120OF has no other function).
Only one-fourth of the water goes through the water heater.
The remaining three-fourths is bypassed around the water
heater. The desired water temperature is maintained by
adjusting one valve. The bypass valve should be left open
far enough to maintain water temperature in the tank at
120OF or higher.
The temperature of the water after the bypass is increased
only 2OF to 5OF, and is ideal for reintroducing back into the
pool. See Figure 20, page 29. Also see Figure 27, page 35,
for hookup drawing.
NOTE: Install only on non-combustible flooring.
Engineering Manual
Note: If chlorinated water is used, the dip tube must be
removed from the heater and the drain valve must be used
as the inlet.
TABLE 18
Sizing swimming pools, hot tubs, baptistries
Factors
HEATING
TIME IN
HOURS
20 F
RISE
O
25 F
RISE
O
30OF
RISE
40OF
RISE
50OF
RISE
60OF
RISE
1 250 300
375 500 625 720
2 120 150 180
250 300
360
3
80 100 120 160 200 240
4
60 75 90 120 150 180
5
48 60 72 96 120 144
6
40 50 60 80 100 120
7
34 42 52 68 85 102
8
30 37
45 60 75 90
9
26 32 39 52 65 78
10 24 30 36 48 60 72
12 20 25
30 40
50 60
24 10 12.5 15
20
25 30
48 *5 *6.3 *7.5 10 12.5 15
72 3.4 4.25 5.1 6.8 8.5 10.2
96 2.5 3.0 3.75 5.0 6.25 7.5
* Most commonly used
Note: For swimming pools, heating periods of 48 to 72 hours
are usually acceptable. For baptistries, the heating period is
typically five to 12 hours.
27
VENTING THE WATER HEATER
The purpose of venting a gas or oil-fired water heater is to
completely remove all products of combustion and to vent
gasses to the outside air without condensation in the vent
or spillage at the draft hood (except in cases of downdraft
or poor stack conditions).
Sealed Combustion / Balanced Flue: A system consisting of an appliance specifically designed, constructed
and installed so all air for combustion is derived from the
outside atmosphere and all flue gases are discharged to
the outside atmosphere.
To assure correct venting, use a strong, gas-tight insulated
pipe with a cross section equal to that of the flue collar or
drafthood outlet and of sufficient vertical height.
INDIVIDUAL VENTS
During vent installation, avoid sharp turns, long horizontal
runs and improper pitches. Maintain proper support of vent
connectors and joints, observe clearances from all combustibles, and top the vent outlet with an approved cap.
Type “L” vent is double walled vent. Type “L” is stainless
lined and used for oil and Power Gas heaters. Type “B”, due
to its temperature rating, can only be used with atmospheric
gas water heaters.
All venting installations must conform with local codes. In the
absence of local codes, refer to “National Fuel Gas Code”
NFPA 54 and “Standard for the Installation of Oil-burning
Equipment” NFPA 31 (Tables 21-33 are based on NFPA 54).
An “individual” vent is defined as a single independent vent
for one appliance. “Total Vent Height” is the measured vertical
distance between the flue outlet and the vent top. The position or rise of a connector – or the location of an offset – has
no effect on the “Total Vertical Height.” “Length of Lateral” is
the horizontal distance or offset between the flue outlet and
the final vertical portion of the vent. See Figure 21.
Figure 22: Typical Individual Venting
10’
20’
TYPE “L”
Note: Fan min. and max. applies to oil and power gas heaters;
nat. max. refers to vent hood-equipped appliance.
TYPES OF VENTING
Natural Draft: The venting of combustion products through a
venting system (vent piping) and chimney by natural means.
Induced Draft: A power operated fan, blower or other mechanical device installed in the chimney connector (vent
piping) between the appliance and chimney to increase
natural draft (rarely used since the advent of high speed
flame retention burners).
Power / Sidewall Venting: A combination of a mechanical fan
(power venter), air pressure switch, post-purge control (timed
or temperature), barometric damper and flue connectors designed to exhaust combustion gases through the side wall of
a structure to the outside atmosphere in lieu of a chimney.
Figure 21: Single Water Heater Venting
BAROMETRIC
DAMPER
Using the Individual Vent Tables
To determine the proper vent size for an individual vent, use
Tables 21-25, pages 44-49 (depending on vent type).
Example: A typical individual venting project is shown
in Figure 22. The Power Gas water heater has a 200,000
BTUH capacity, and a 6” flue.
To determine the size of the vent, go down the Total Vent
Height column (Table 21, page 44) to the 20’ height, then
across to the right on the line for 10’ lateral. 62,00 BTUH
min. and 351,000 BTUH max. capacity is shown in the 6”
fan min/max column. This system should work fine.
Vent Reductions
BAROMETRIC
DAMPERS
28 www.bockwaterheaters.com
The vent size determined by Tables 21-33, pages 44-56
may be used as long as the vent is at least 10’ high. When
a vent is shorter than 10’, the vent should be at least as
large as the flue. Vents for draft hoods 12” in diameter or
less should not be reduced more than one pipe size. A
six-to-five inch, or a twelve-to-ten inch reduction is a one
pipe size reduction. For larger gas-fired equipment, such as
boilers having drafthood sizes from 14” to 24” diameters,
reduction of more than two pipe sizes is not recommended
(24-to-20 inches is a two-size reduction).
Engineering Manual
THE COMMON VENT
A “combined” vent is a venting system for two or more appliances at one level that are attached to a common vent.
Least Total Height is the vertical distance from the highest
appliance flue outlet in the system to the top of the vent
(see Figure 23). This is one fixed dimension for any one
system, regardless of the number or placement of appliances in the system.
Connector Rise for any appliance is the vertical distance
from its flue outlet to the point where the next connector
joins the system.
A Common Vent is the portion of the venting system above
the lowest interconnection. L-venting is typically used for gas
and oil. B-venting may be used for gas only where permitted
by local codes. Both are double wall vents. “L” vent uses a
stainless steel liner; “B” vent uses an aluminum liner.
Using the Common Vent Tables
DETERMINING EACH VENT CONNECTOR SIZE:
1. Determine the Least Total Height for the system.
2. Determine the Connector Rise for each appliance.
3. Enter the Vent Connector Tables (Tables 27-30) at the
appropriate Least Total Height. Continue across to the
right on a line for the first appliance Connector Rise to
the name plate BTUH rating (or the next higher rating)
for that appliance. Read the connector vent size for that
appliance at the top of the column.
4. At the Least Total Height, repeat the procedure for the
Connector Rise and BTUH rating for each appliance.
Caution: Never use a connector smaller than draft hood
outlet size.
Caution: Regardless of the table results, the common vent
must always be at least as large as the largest connector. If
both connectors are the same size, the common vent must
be one size larger.
Example: Figure 24 shows a typical two-appliance combined vent and relative individual connector sizes. Use the
following procedure:
A. Enter the Vent Connector Table (Table 27) at the Least
Total Height of 15 feet, and a Connector Rise of one
foot. Read across to the BTUH rating for natural gas
heaters next higher than the water heater rating. This
is the column showing 53,000 BTUH. At the top of this
column, a four inch connector size is designated for the
water heater. See Figure 22, Drawing 1.
B. Enter the Vent Connector Table again, this time at the
same Least Total Height of 15 feet, but for the furnace
Connector Rise of three feet. Read across to 111,000
BTUH or the next higher rating above 105,000 BTUH.
At the top of this column a vent connector size of five
inches is designated for the furnace connector. See
Figure 19, Drawing 2.
C. The sum of the two ratings is 140,000 BTUH. Enter the
Common Vent Table at the same Least Total Height of
15 feet and look in the natural gas column. For a total
capacity of 144,000 BTUH, the column heading directs
the use of a five inch common vent for this system. See
Figure 24, Drawing 3.
Figure 23: Dual Water Heater Venting
DETERMINING THE SIZE OF A COMMON VENT:
1. Add together all appliance BTUH input ratings to determine the total BTUH rating.
2. Enter the Common Vent Tables (Tables 27-30) at the
Least Total Height.
3. Continue across to the right; stop at the first value which
is equal to or greater than the total BTUH rating.
4. Read the size of the common vent at the top of the
column.
Figure 24: Determining the use of a 5” common gas vent
Drawing 1
Engineering Manual
Drawing 2
Drawing 3
29
COMBUSTION AND VENTILATION AIR
Properly sized vents are vital for the safe and efficient operation
of a Bock water heater installed in a confined space. When combustion and ventilation air are supplied from inside the building,
each opening must have an area of one square inch for every
1,000 BTUH input. When combustion air is supplied from the
outside, each opening must have an area of one square inch for
every 2,000 BTUH for horizontal ducts and one square inch for
every 4,000 BTUH for vertical ducts (refer to NFPA 31, 54).
The Bock BCS is exempt from these requirements because
all combustion air is supplied from outside the heated space
(however, some air for ventilation is desirable),
Most oil burners and some Power Gas burners can also
be equipped with outside air kits (available from the burner
manufacturer) that draw combustion air from the outside
through a duct system. This eliminates the need the supply
combustion air through louvered ducts as described previously (ventilation air is still required). Air may also be required
for draft hood or barometric damper operation.
As an alternative, combustion air may be supplied by a
powered blower system such as a Field “Fan in a Can”
or Tjernlund “In-forcer.” These systems are powered on
a call for heat, and force outside combustion air into the
room through their own duct system. These systems, when
properly sized, eliminate the need for any other combustion air ducting to the outside or other parts of the building.
Consult the manufacturer of these systems for installation
information and sizing.
BALANCED COMBUSTION SYSTEM (bcs)
Flue outlet placement is of utmost importance for maximizing the performance of the Bock Balanced Combustion
System (US patent # 5,924,390).
BALANCED FLUETM
Use a flat wall for the flue outlet and stay a minimum of four
feet from corners or any structure to reduce eddy currents.
To reduce frosting effects, place the outlet as far as possible from windows and doors – four feet is a minimum (per
NFPA 31 A-1-12.3).
A minimum distance of three feet from the outlet to plants
and shrubs is suggested; a greater distance is preferred,
as the moisture and frost effects can result in damage or
loss.
1. Cut a 7” O.D. opening in the preferred wall and provide
a minimum of 1/2” clearance of non-combustible
space around the Balanced FlueTM. The opening should allow for a 1/2”
downward pitch to the
outside for drainage of any condensate in the Balanced FlueTM.
The east or south wall (or wall opposite of prevailing winds)
is the preferred wall for installation if prevailing winter
winds are typically out of the north or west. This reduces
the likelihood that the Balanced FlueTM application will be
operating against high winds and severe cold when it is
cycling the most often.
The flue outlet must be placed at least one (1) foot above the
highest anticipated snow load to prevent flue blockage.
2. Insert the Balanced FlueTM from
the inside through the wall and
fasten to the inside wall with the
tabs provided. Check the outside
extension to be sure air inlet holes
are exposed. On the outside wall,
install the flashing ring provided.
Caulk around the outer rim of the
flashing ring to prevent moisture
from entering through the wall.
* Insufficient or Excessive Draft (NATURAL & POWER VENT)
Excessive or insufficient draft can cause poor burner performance, excessive combustion noise and improper
combustion or sooting. On Bock products, stack draft should
be a minimum of -0.02” W.C. and a maximum of -0.05” W.C.
where there is insufficient draft, install the properly sized
draft inducer. Where excessive draft is encountered, install
the properly sized barometric draft regulator. Note: All Power
Gas heaters must use a barometric damper.
For sizing and technical information on draft inducers
and diverters, please contact the manufacturer of the
equipment: Field Controls Co., 252/522-3031 or Tjernlund
Products, Inc., 800/255-4208.
* Does not apply to BCS applications.
30 www.bockwaterheaters.com
Engineering Manual
* Barometric Draft Controls (NATURAL & POWER VENT)
Barometric draft controls and draft inducers can be used
to correct draft problems found in some applications. A
barometric draft control will bring room air into the vent to
decrease the draft and a draft inducer will help force air
away from the appliances.
Barometrics should be installed on all Bock power gas and
dual fuel heaters to fine tune the equipment for optimal
efficiency. A barometric is not used on Bock atmospheric
gas heaters equipped with draft hoods.
* Does not apply to BCS applications.
TABLE 19A
POWER VENT SELECTION – TJERNLUND PRODUCTS
GPAK/HS-SERIES (Residential/light commercial)
MODEL
#
VENT
PIPE BUT/HR
DIA. INPUT
MAXIMUM PIPE
LENGTH (FT)
AT STACK TEMP
OIL
GAS
FIRED
FIRED
o
o
300 F 400 F 500oF
HS-3, 4, 5 SERIES (Commercial)
VENT
MODEL PIPE BUT/HR
#
DIA. INPUT
CFM @ 70oF
0”
SP
.50” .75” 1.0” 1.4”
SP SP SP SP
HSUL-J 4” 50,000 100’ 100’ 100’
HST-J ** 75,000 100’ 100’ 100’ 110 85 67 10 HS115-J 100,000 100’ 100’ 100’
GPAK-J 125,000 35’ 23’ –
GPAK-JT
4” 150,000 100’ 60’
35’
200,000 87’ 57’ 27’
250,000 40’ 12’ –
HSUL-1 300,000 4’ –
–
HST-1 158 115 95 12 HS115-1 6” 150,000 100’ 100’ 100’
GPAK-1 * 200,000 100’ 100’ 100’
GPAK-17* 250,000 100’ 92’ –
300,000 30’ –
–
6” 350,000 100’ 100’ 100’
400,000 100’ 100’ 100’
450,000 100’ 100’ 67’
500,000 100’ 72’ –
550,000 94’ –
–
HSUL-2 600,000 15’ –
–
HST-2 ** HS115-2 8” 350,000 100’ 100’ 100’
400,000 100’ 100’ 100’
450,000 100’ 100’ 100’
500,000 100’ 100’ –
550,000 100’ –
–
600,000 67’ –
–
–
–
286 235 215 196 158
DIMENSIONS
A DIA.
B
C
D
E
F
G
3” 6 1/4” SQ. 8 1/2” 10” 10” 5 1/4” 7 3/4” 6 3/4” SQ.
VH1-4” 4” 7 1/2” SQ. 7 1/8” 13” 8 5/8” 7 3/8” 11” 8” SQ.
VH1-6” 6 1/2” 8 1/2” DIA. 7 7/8” 12” 9 1/2” 10 1/2” 10” 9” DIA.
B
A DIA.
MODEL
VH1-8” 8” 15 1/4” VH1-10” 10” 15 1/4” Engineering Manual
DIMENSIONS
C
D
E
ROUGH-IN
DIMENSIONS
9” 18 3/8” 20” 8 1/2” DIA.
9” 18 3/8” 20” 10 1/2” DIA.
25% Dilution
400oF
GAS FIRED
Power Burner
w/Barometric
CFM @ 70oF
0”
SP
.50” .75” 1.0” 1.4”
SP SP SP SP
8” 700,000 100’ 100’
800,000 100’ 100’
900,000 100’ 100’
1,000,000 70’ 100’
1,100,000 32’ 100’
1,200,000 5’ 100’
10” 700,000 100’ 100’
800,000 100’ 100’
900,000 100’ 100’
HS-4 1,000,000 100’ 100’
1,100,000 97’ 100’
1,200,000 14’ 100’
12” 700,000 100’ 100’
800,000 100’ 100’
900,000 100’ 100’
1,000,000 100’ 100’
1,100,000 100’ 100’
1,200,000 34’ 100’
925 800 730 620
425
10” 1,200,000 100’ 100’
1,400,000 100’ 100’
1,600,000 100’ 100’
1,825,000 29’ 100’
12” 1,200,000 100’ 100’
1,400,000 100’ 100’
1,600,000 100’ 100’
1,825,000 72’ 100’
14” 1,200,000 100’ 100’
1,400,000 100’ 100’
1,600,000 100’ 100’
1,825,000 100’ 100’
925 800 730 620
425
ROUGH-IN
DIMENSIONS
VH1-3”
100% Dilution
300oF
GAS FIRED
Atmospheric
w/Draft Hood
or Draft Diverter
8” 450,000 100’ 100’
500,000 100’ 100’
600,000 100’ 100’
700,000 7’ 100’
HS-3 500 425 380 325 110
10” 450,000 100’ 100’
500,000 100’ 100’
600,000 100’ 100’
700,000 21’ 100’
VH1 SERIES VENT HOODS
MODEL
MAXIMUM PIPE
LENGTH (FT)
AT STACK TEMP
HS-5
31
TABLE 19B
POWER VENT SELECTION – FIELD CONTROLS
MODEL
MAX. OIL
GPH
INPUT
MAX.
BTUH
INPUT
Max. Equivalent Feet
of Vent Pipe
VENT
at MAX.
60% of
PIPE
BTUH MAX. BTUH
SIZE
INPUT
INPUT
21 80 SWG-3 N/A 70,000
50100
––
23
35100
SWG-4 HD 1.10 170,000
65100
16
44
SWG-5 1.85 290,000
51100
95100
28
78
SWG-6 2.65 416,000
68100
100100
28
78
SWG-7 3.60 566,000
61100
90100
26
72
SWG-8 4.75 740,000
51100
70100
3”
4”
3”
4”
5”
4”
5”
6”
5”
6”
7”
6”
7”
8”
7”
8”
9”
MODEL
DIA.
PVG-100
3” PVGPAK-100* 4”
DIA.
4”
PVG-300
PVGPAK-300* 5”
6”
DIA.
PVG-600
5”
DIA.
Max. Equivalent Feet of Vent Pipe
GAS BTUH Input
55,000
70,000
25,000
100,000
270 100
–––
–––
455169144100
100,000
145,000
220,000
310,000
305145
64
––
247100
––
334147
––
54
74
220,000
400,000
145,000
413181
310,000
400,000
310,000
91
54
520,000
610,000
6”146
87
52
––
8”
216134
86
66
* PVG PAKs include a Power
Venter, 4” MG-1 Draft Control and 4” vent hood.
Max. Equivalent Feet of Vent Pipe
MODEL
OIL GPH Input
DIA.
PVO-300
4”
5”
6”
DIA.
5”
PVO-600
DIA.
0.75
1.00
1.50
287150
75
––
257120
––
346172
2.25
––
51
70
1.00
1.50
2.25
428
212
86
46
2.25
3.00
3.75
4.00
51
84
––
77
6”143
74
8”
211116
3.00
THE DRAFT INDUCER
To adjust air flow on Tjernlund Products, Inc.* draft inducers, manually bend the draft adjustment plate until desired
draft is obtained. For all models, loosen the nut and adjust
the position of the draft adjustment plate until desired draft
is obtained.
A Field Controls Company** barometric draft control should
be installed on Bock Power Gas water heaters to fine tune
the desired draft at the water heater. A barometric draft
damper is not recommended on Bock oil-fired water heaters unless excessive draft is encountered; -.07 W. C., or
greater.
Seal all pipe joints and seams on the pressure side of the
inducer with a high temperature silicone adhesive sealant or
equivalent. Note: A barometric draft control is not normally
required on Bock gas-fired water heaters equipped with
draft hoods. Before operating, run draft inducer through
two or three cycles to insure proper installation.
* Tjernlund Products, Inc., 1601 9th St., White Bear Lake, MN
55110, 651/426-2993 or 800/255-4208.
** Field Controls Company, 2630 Airport Road, Kinston, NC 28504,
252/522-3031.
FIGURE 25: Inducer mounted vertically
Installation
32 www.bockwaterheaters.com
Engineering Manual
SPECIALIZED INSTALLATION HOOKUPS
Figure 26: Dual temperature water for food service application
DISHWASHER
Figure 27: Swimming pool, hot tub or baptistry hookup
Engineering Manual
33
BOILER
SYSTEM
SUPPLY
3/4"
3/4"
INDIRECTDOMESTIC
WATER
HEATER
INSTALLATION
COLD
CIRCULATOR
HOT OUT
INLET
Figure 28: 30SK, 40SK & 50SK installed with boiler
3/4"
DOMESTIC
HOT OUT
PUMP
BOILER
SYSTEM
SUPPLY
3/4"
COLD
INLET
CIRCULATOR
PUMP
INDIRECT
WATER HEATER
BOILER
INDIRECT
WATER HEATER
FROM
BOILER
1" NPT
TO FROM
BOILER
BOILER
1" NPT1" NPT
TO
BOILER
1" NPT
BOILER
BOILER
SYSTEM
RETURN
CHECK
VALVE
BOILER
SYSTEM
RETURN
CHECK
VALVE
Figure 29: 80SK & 119SK installed with boiler
BOILER
SYSTEM
SUPPLY
CIRCULATOR
PUMP
1 1/2"
DOMESTIC
HOT OUT
BOILER
SYSTEM
SUPPLY
CIRCULATOR
PUMP
1 1/2"
DOMESTIC
HOT OUT
INDIRECT
WATER HEATER
BOILER
INDIRECT
WATER HEATER
1"
COLD
INLET
1"
34 www.bockwaterheaters.com
COLD
INLET
FROM
BOILER
1" NPT
TO FROM
BOILER
BOILER
1" NPT
1" NPT
TO
CHECK
VALVE
CHECK
BOILER
BOILER
SYSTEM
RETURN
BOILEREngineering Manual
SYSTEM
RETURN
INDIRECT WATER HEATER INSTALLATION
See Figure 30 for piping your Bock Indirect Coil Tank Water Heater to a low-mass boiler
(diagram recommended by boiler manufacturer).
Figure 30: Bock Indirect with Low-Mass Boiler
TO
HEATING
ZONE
FROM
HEATING
ZONE
CHECK
VALVES
ZONE
CIRCULATORS
ISOLATION
VALVES
ISOLATION
VALVES
AIR
SEPARATOR
LESS THAN (4)
PIPE DIAMETERS
AIR VENT
ADDITIONAL
ZONES
ADDITIONAL
ZONES
BOILER
CIRCULATOR
INDIRECT
CIRCULATOR
EXPANSION
TANK
INDIRECT WATER
HEATER
COLD
WATER
INLET
BOILER
Engineering Manual
35
SYSTEM PLUS INSTALLATION FOR HYDRONIC HEATING
Figure 31
EXPANSION
TANK (OPT.)
FLOW
CHECK
If any of these devices are used, a properly
sized expansion tank must be installed
(also applies to all closed-loop systems).
System Plus with BCS
EXPANSION
TANK (OPT.)
36 www.bockwaterheaters.com
Engineering Manual
RADIANT HEATING
Where permitted by code jurisdictions, a domestic water
heater may be used as a heat source for hydronic radiant
heating in a closed system, provided all generally accepted
plumbing practices for closed-loop hydronic heating are
used.
Sizing: The water heater net output should be within the
range of 100% to 120% of the calculated heat loss unless
design factors, piping losses or water heater ratings require
that the selection exceed this range.
✔ Bock water heaters operate at lower temperatures than
boilers, using less fuel to heat potable and radiant water
✔ Bock water heaters’ high BTU output makes them far
more efficient for radiant heating than boilers
✔ One unit heats both water and the home for greater
economy
✔ A well-designed hydronic radiant system can reduce
fuel use by as much as 40%
Additional output capacity should be allowed when other
heating demands such as domestic water, priority systems,
hot tubs, swimming pools, snow-melting equipment, etc.
are serviced from the water heater.
✔ Hydronic radiant supply heat is between 90OF to 140OF;
conventional heat supply heat is between 160OF to 200OF
Note: Proper sizing of the water heater can be obtained
from the radiant equipment manufacturer using their design
criteria.
✔ Hydronic radiant heat can be used in new construction
and retrofitting or remodeling.
✔ Hydronic radiant heat works with conventional heating
systems and is ideal for hard-to-heat areas
✔ Hydronic radiant heat uses hot water to warm the home,
avoiding the dry “scorched” air produced by conventional heating systems.
Figure 32: Water heater installation for radiant and domestic
water heating
if requried by
local code
Engineering Manual
37
COMBINED APPLIANCE SIZING
Water Heater Sizing
Three factors must be considered:
1. Heat loss of structure
2. Hot water consumption
3. Required storage (hot tubs, whirlpools, multiple or
larger shower heads)
Method 1:
Calculate heat loss of the structure and add 10% for
an average family of four to obtain the minimum output
of the required water heater.
75,000 BTU (heat loss) + 7,500 BTU (10% allowance for a
family of four) = 82,500 BTU (required minimum output)
With this information, the required input can be calculated
as follows:
Output - recovery efficiency ** = minimum input required
Method 2
Multiply the heat loss of the structure by a factor of 1.51*
to obtain the input requirements of the water heater. (In
northern tier states, a factor of 1.58 is suggested.)
75,000 BTU (heat loss) X 1.51 = 113,250 minimum BTU
input
* This is a quick estimate calculation and should only be
used to estimate heater sizing.
Air Handler / Coil Unit Sizing
Determine the heat loss of the area to be heated. Select an
air handler / coil unit with a heating output that exceeds the
space heat loss. The heating output of the air handler / coil
(BTUH) must not exceed the output (BTUH) of the water
heater. Consult with the air handler / coil manufacturer for
specifications.
Example: 82,500 (BTU output) divided by 80% (.80) =
103,125 (minimum BTU input)
** recovery efficiency per GAMA directory
MULTIPLE HOOKUPS
There are four types of hookups, each with their own advantages and disadvantages.
The Parallel System
The parallel system permits water heaters to be operated
at the same temperature if they are perfectly balanced in
the piping. Perfect balance is easy to accomplish with a
new installation but almost impossible when either heater
is replaced or the piping is altered. Any piping imbalance
results in one heater working more than the other and
reduces recovery and usable storage. The parallel system
allows for isolating either water heater at any time and is
recommended when high volume peak loads occur in short
periods of time and the gallons-per-hour flow is a prime
factor in sizing.
The Series System
The series system solves the imbalance problem by forcing
all the water through both heaters to maintain full recovery
rates. The first heater is usually set at a lower temperature
(i.e. 120OF) than the second heater (i.e. 140OF). While the
first heater must raise the water temperature by about 65
degrees and the second by only 20 degrees, they work
equally hard because maintaining the higher water temperature of the second heater is as hard on a water heater as the
longer firing time of the first heater. The series system also
has the advantage of being a simpler, less costly installation, a better hookup for drawing off hot water in the tanks
38 www.bockwaterheaters.com
and a means of prolonging the life of the heaters. However,
pressure drop through the system is greater and less flow
per minute is available.
The Isolating Series
The isolating series is a variation of the series system resulting in full recovery rates, equal life expectancy and easy
isolation of either unit. This system provides a backup in
case of heater failure, can be a cost savings versus one
large unit and can provide dual temperature water without
mixing valves.
The Reverse Storage Tank System
The reverse storage tank system draws hot water off the
heater and uses the storage tank as backup. It is ideal for
applications such as schools or country clubs having high
water demands for nine months of the year and minimal requirements for the remaining three months. When the extra
capacity is not required, the circulating pump can be turned
off. This system allows a smaller water heater to maintain
high peak loads by running off-peak to maintain extremely
large reserves for peak periods. This system will maintain
uniform temperatures for long periods of time, until both
the heater and storage tank have exhausted their storage
capacity. If necessary, the tank can be maintained with
its own thermostat at a lower temperature than the water
heater. This is also a good application for two-temperature
water without a mixing valve.
Engineering Manual
Figure 33: Three water heaters in series
Figure 34:
Series hookup
with bypass
Figures 35 and 36: Two water heaters with mixing valve
Figure 35: Large 140 F load
Figure 36: Three-temperature water
O
(with occasional 180OF requirements)
Engineering Manual
39
Figure 37: REVERSE STORAGE TANK
SYSTEM HOOKUPS
Using a reverse storage tank system hookup can
reduce energy consumption when compared to
a conventional hookup if the pump is turned off
whenever the extra storage capacity is not needed.
Such applications are recommended for use in
schools using hot water only nine months each year,
churches that use large amounts of hot water primarily on weekends, milk houses, dorms, weekend
residential housing and homes with large whirlpools
or hot tubs. The reverse storage tank system reduces standby losses and allows a small heater to
provide as much hot water as a larger unit.
WATER HEATER WITH STORAGE TANK
Figure 38
Figure 39: Single heater and large
storage tank, gravity flow
STORAGE TANK AND BOILER INSTALLATION
Figure 40
40 www.bockwaterheaters.com
Engineering Manual
TWO HEATERS AND STORAGE TANK – PARALLEL PIPING
Figure 41
TWO INDIRECT WATER HEATERS WITH HEAT SOURCE
Figure 42
Engineering Manual
41
WEIGHTS, MEASURES, METRIC CONVERSIONS – Table 20
LINEAR MEASURE
10 Millimeters 10 Centimeters 10 Decimeters 10 Meters 10 Dekameters 10 Hectometers METRIC SYSTEM
U.S. SYSTEM
= 1 Centimeter
= 1 Decimeter
= 1 Meter
= 1 Dekameter
= 1 Hectometer
= 1 Kilometer
LINEAR MEASURE
12 inches 3 feet 5 1/2 yards 40 rods 8 furlongs (5,280 feet) 3 land miles 6,086 feet
= 1 foot
= 1 yard
= 1 rod
= 1 furlong
= 1 mile
= 1 league
= 1 intnl. nautical mile
AREA MEASURE
100 sq. Millimeters 10,000 sq. Centimeters 1,000,000 sq. Millimeters 100 sq. Meters 100 Ares 100 Hectares 1,000,000 sq. Meters = 1 sq. Centimeter
= 1 sq. Meter
= 1 sq. Meter
= 1 Are (a)
= 1 Hectare (ha)
= 1 sq. Kilometer
= 1 sq. Kilometer
VOLUME MEASURE
1 liter 10 millimeters 10 centiliters 10 deciliters 10 liters 10 dekaliters 10 hectoliters
AREA MEASURE
144 sq. inches 9 sq. feet 30 1/4 sq. yards 160 sq. rods 640 acres
1 sq. mile 36 sections = 1 sq. foot
= 1 sq. yard
= 1 sq. rod
= 1 acre
= 1 sq. mile
= 1 section
= 1 township
=
0.001 cubic meter
= 1 centiliter
= 1 deciliter
= 1 liter
= 1 dekaliter
= 1 hectoliter
= 1 kiloliter
LIQUID MEASURE
4 gills (2 cups) 2 pints 4 quarts = 1 pint
= 1 quart
= 1 gallon
WEIGHT
10 milligrams 10 centigrams 10 decigrams 10 grams 10 dekagrams 10 hectograms 1,000 kilograms = 1 centigram
= 1 decigram
= 1 gram
= 1 dekagram
= 1 hectogram
= 1 kilogram
= 1 metric ton
DRY MEASURE
2 pints 8 quarts 4 pecks = 1 quart
= 1 peck
= 1 bushel
WEIGHT
27 11/32 grams 16 drams 16 ounces 100 pounds 20 hundredweight
= 1 dram
= 1 ounce
= 1 pound
= 1 hundredweight
= 1 ton
GENERAL WEATHER GUIDELINES IN CELCIUS & FAHRENHEIT
0 C ..............Freezing point of water (32OF)
10OC ..............Warm winter day (50OF)
20OC ..............Mild spring day (68OF)
30OC ..............Warm day (86OF)
37OC ..............Normal body temperature (98.6OF)
O
40OC ..............Heat wave conditions (104OF)
100OC ..............Boiling point of water (212OF)
O
C = (OF - 32) * 5/9
O
F = (OC * 9/5) + 32
MEASUREMENT CONVERSIONS
FROM MULTIPLY BY ..TO FIND
.394 ..............Inches
Centimeters
.0328 ............... Feet
30.48 .......Centimeters
Feet .3048 ........... Meters
.0001894 ........Miles
.3333 ............. Yards
8.0 .................... Pints
Gallons 3.785 ............... Liters
4.0 ................. Quarts
.035 ............Ounces
Grams .002 ............ Pounds
.001 ........ Kilograms
2.54 .......Centimeters
Inches .0833 ............... Feet
.0254 ........... Meters
.0278 ............. Yards
42 www.bockwaterheaters.com
FROM MULTIPLY BY ..TO FIND
Kilograms 1,000.0 ..................Grams
35.274 ............Ounces
2.205 ............ Pounds
Kilometers 3281 ........................ Feet
1,000.0................. Meters
.621 ................Miles
1093.0 ................... Yards
2.113 ................ Pints
Liters .264 ............ Gallons
1,000.0............... Milliliters
3.281 ................. Feet
Meters 39.37 ................Inches
.001 ....... Kilometers
.0006214 ........Miles
1.093 ............... Yards
FROM MULTIPLY BY ..TO FIND
5,280.0..................... Feet
Miles 1,770.0.................... Yards
1,609.0 ........... Kilometers
28.35 ................Grams
Ounces .0625 .......... Pounds
.028 ........ Kilograms
.473 ............... Liters
Pints .50 ............... Quarts
.0125 .......... Gallons
453.59 ................Grams
Pounds 16.0 ................Ounces
.454 ........ Kilograms
2.0 .................... Pints
Quarts
.946 ............... Liters
.25 .............. Gallons
.914 ............. Meters
Yards .0005682 ........Miles
Engineering Manual
BOCK ENGINEERING MANUAL TABLES
VENT TABLES • pages 46-56
National Fuel Gas Code, 2006 Edition, ANSI Z223.1 • NFPA 31, 2006 Edition
INDIRECT COIL TANK PERFORMANCE TABLES • page 57
OIL & GAS PERFORMANCE TABLES • pages 58-75
COMBUSTION EFFICIENCY TABLES • page 76
Using the Individual Vent Tables
To determine the proper vent size for an individual vent:
1. Determine Total Vent Height and Length of Lateral based
on water heater and vent location, plus height to top, or to
chimney-styled roof assembly.
2. Read down the Total Vent Height column (first column) to a
height equal to or less than the total vent height.
4. Read across to the first column which shows a capacity equal
to or greater than the water heater name plate heat input.
Be certain to view the correct column for your burner/heater
type.
5. If the vent size shown at the top of the column containing the
correct capacity is equal to or larger than the water heater
vent connector, use the vent determined.
3. Select the horizontal row of the table for the appropriate
Length of Lateral (use zero for straight vertical vents).
STANDBY LOSS FORMULA
1. Gallons in tank X 8.25 X 90 F = Stored Heat
o
2. Stored Heat X % Standby Loss X Hours on standby =
Standby BTU
3. Standby BTU X $ per gallon = Standby Cost Per Day
138,500 BTU
Example:
(32 X 8.25 X 90oF) X (.03) X 23.2 = 16,537 BTUs
22,049.28 x 1.10 = $.175 per day x 365 = $63.91 per yr
138,500
ENERGY / POWER CONVERSIONS
1 btu = 1.055 kJ
1 kJ = 0.9478 BTU
1 BTU/hr = 0.2931 kW
1 W = 3.412 BTU/hr
1 hp (550 ft/lbs) = 0.7457 kW
1 kW = 1.341 hp
1 hp = 2545 BTU/hr
1 BTU/hr = 0.000393 hp
1 BTU = 252 cal
To reduce standby loss by 1%:
16,375
23760 X .03 X 23.2 =
x 1.10 = $.131 per day
38.500
x 365 = $47.94
Add $30 to $40 for piping losses
for an accurate prediction of water heating costs.
Equivalencies
Raising one
gallon of water:
Requires a
BTUH input of:
140°F
1,666
1 gal. fuel oil =
140,000 BTU’s
120°F
1,428
1 gal. propane =
90,000 BTU’s
100°F
1,190
1 lb. propane =
21,500 BTU’s
90°F
1,071
1 gal. butane =
100,000 BTU’s
80°F
852
1 lb. butane =
21,000 BTU’s
70°F
833
1 kwH =
3,413 BTU’s
60°F
714
1 gal. water =
8.34 lbs
50°F
595
1 cubic ft. water =
7.5 gal.
40°F
476
Engineering Manual
43
TABLE 21
Height
Lateral
Capacity of Type B Double-Wall Gas Vents (when connected directly to a single Catagory 1 appliance)
3”
H
(ft)
L
(ft)
FAN
Min
Max
6
8
10
15
20
30
50
100
4”
NAT
Max
FAN
Min
Max
Appliance Input Rating in Thousands of BTU per Hour
5”
6”
7”
NAT
Max
FAN
Min
Max
NAT
Max
FAN
Min
Max
NAT
Max
FAN
Min
Max
NAT
Max
8”
FAN
Min
Max
9”
NAT
Max
FAN
Min
Max
NAT
Max
0
0
78
46
0
152
86
0
251
141
0
375
205
0
524
285
0
698
370
0
897
470
2
13
51
36
18
97
67
27
157
105
32
232
157
44
321
217
53
425
285
63
543
370
4
21
49
34
30
94
64
39
153
103
50
227
153
66
316
211
79
419
279
93
536
362
6
25
46
32
36
91
61
47
149
100
59
223
149
78
310
205
93
413
273
110
530
354
0
0
84
50
0
165
94
0
276
155
0
415
235
0
583
320
0
780
415
0 1,006
537
2
12
57
40
16
109
75
25
178
120
28
263
180
42
365
247
50
483
322
60
619
418
5
23
53
38
32
103
71
42
171
115
53
255
173
70
356
237
83
473
313
99
607
407
117
596
396
0 1,096
585
8
28
49
35
39
98
66
51
164
109
64
247
165
84
347
227
99
463
303
0
0
88
53
0
175
100
0
295
166
0
447
255
0
631
345
0
847
450
2
12
61
42
17
118
81
23
194
129
26
289
195
40
402
273
48
533
355
57
684
457
5
23
57
40
32
113
77
41
187
124
52
280
188
68
392
263
81
522
346
95
671
446
10
30
51
36
41
104
70
54
176
115
67
267
175
88
376
245
104
504
330
122
651
427
0
0
94
58
0
191
112
0
327
187
0
502
285
0
716
390
0
970
525
0 1,263
682
2
11
69
48
15
136
93
20
226
150
22
339
225
38
475
316
45
633
414
53
815
544
5
22
65
45
30
130
87
39
219
142
49
330
217
64
463
300
76
620
403
90
800
529
10
29
59
41
40
121
82
51
206
135
64
315
208
84
445
288
99
600
386
116
777
507
15
35
53
37
48
112
76
61
195
128
76
301
198
98
429
275
115
580
373
134
755
491
0
0
97
61
0
202
119
0
349
202
0
540
307
0
776
430
0 1,057
575
0 1,384
752
2
10
75
51
14
149
100
18
250
166
20
377
249
33
531
346
41
711
470
50
917
612
5
21
71
48
29
143
96
38
242
160
47
367
241
62
519
337
73
697
460
86
902
599
10
28
64
44
38
133
89
50
229
150
62
351
228
81
499
321
95
675
443
112
877
576
15
34
58
40
46
124
84
59
217
142
73
337
217
94
481
308
111
654
427
129
853
557
20
48
52
35
55
116
78
69
206
134
84
322
206
107
464
295
125
634
410
145
830
537
0
0
100
64
0
213
128
0
374
220
0
587
336
0
853
475
0 1,173
650
0 1,548
855
2
9
81
56
13
166
112
14
283
185
18
432
280
27
613
394
33
826
535
42 1,072
700
5
21
77
54
28
160
108
36
275
176
45
421
273
58
600
385
69
811
524
82 1,055
688
10
27
70
50
37
150
102
48
262
171
59
405
261
77
580
371
91
788
507
107 1,028
668
15
33
64
NA
44
141
96
57
249
163
70
389
249
90
560
357
105
765
490
124 1,002
648
628
20
56
58
NA
53
132
90
66
237
154
80
374
237
102
542
343
119
743
473
139
977
30
NA
NA
NA
73
113
NA
88
214
NA
104
346
219
131
507
321
149
702
444
171
929
594
0
0
101
67
0
216
134
0
397
232
0
633
363
0
932
518
0 1,297
708
0 1,730
952
2
8
86
61
11
183
122
14
320
206
15
497
314
22
715
445
26
975
615
33 1,276
813
5
20
82
NA
27
177
119
35
312
200
43
487
308
55
702
438
65
960
605
77 1,259
798
10
26
76
NA
35
168
114
45
299
190
56
471
298
73
681
426
86
935
589
101 1,230
773
15
59
70
NA
42
158
NA
54
287
180
66
455
288
85
662
413
100
911
572
117 1,203
747
20
NA
NA
NA
50
149
NA
63
275
169
76
440
278
97
642
401
113
888
556
131 1,176
722
141
161 1,125
670
30
NA
NA
NA
69
131
NA
84
250
NA
99
410
259
123
605
376
844
522
0
NA
NA
NA
0
218
NA
0
407
NA
0
665
400
0
997
560
0 1,411
770
2
NA
NA
NA
10
194
NA
12
354
NA
13
566
375
18
831
510
21 1,155
700
25 1,536
935
5
NA
NA
NA
26
189
NA
33
347
NA
40
557
369
52
820
504
60 1,141
692
71 1,519
926
10
NA
NA
NA
33
182
NA
43
335
NA
53
542
361
68
801
493
80 1,118
679
94 1,492
910
15
NA
NA
NA
40
174
NA
50
312
NA
62
528
353
80
782
482
93 1,095
666
109 1,465
895
20
NA
NA
NA
47
166
NA
59
311
NA
71
513
344
90
763
471
105 1,073
653
122 1,438
880
30
NA
NA
NA
NA
NA
NA
78
290
NA
92
483
NA
115
726
449
131 1,029
627
149 1,387
849
50
NA
NA
NA
NA
NA
NA
NA
NA
NA
147
428
NA
180
651
405
197
575
217 1,288
787
44 www.bockwaterheaters.com
944
0 1,908 1,040
Engineering Manual
TABLE 21 ...continued
Height
Lateral
Capacity of Type B Double-Wall Gas Vents (when connected directly to a single Catagory 1 appliance)
10”
H
(ft)
L
(ft)
FAN
Min Max
0
6
2
15
20
850
0 2,267 1,170
650 138 1,346
0 2,983 1,530
NAT
FAN
Max Min Max
0 3,802 1,960
22”
NAT
FAN
Max Min Max
0 4,721 2,430
0
890 178 1,769 1,170 225 2,250 1,480 296 2,782 1,850 360
24”
NAT
FAN
Max Min Max
5,737 2,950
NAT
Max
0
6,853
3,520
3,377 2,220 426
4,030
2,670
668
445 147
975
640 191 1,338
880 242 1,761 1,160 300 2,242 1,475 390 2,774 1,835 469
3,370 2,215 555
4,023
2,660
661
435 171
967
630 219 1,330
870 276 1,753 1,150 341 2,235 1,470 437 2,767 1,820 523
3,363 2,210 618
4,017
2,650
6,555 3,360
7,838
4,010
0 1,261
660
0 1,858
970
0 2,571 1,320
0 3,399 1,740
0 4,333 2,220
0 5,387 2,750
0
0
2
71
770
515
98 1,124
745 130 1,543 1,020 168 2,030 1,340 212 2,584 1,700 278 3,196 2,110 336
3,882 2,560 401
4,634
3,050
5
115
758
503 154 1,110
733 199 1,528 1,010 251 2,013 1,330 311 2,563 1,685 398 3,180 2,090 476
3,863 2,545 562
4,612
3,040
8
137
746
490 180 1,097
720 231 1,514 1,000 289 2,000 1,320 354 2,552 1,670 450 3,163 2,070 537
3,850 2,530 630
4,602
3,030
7,254 3,710
8,682
4,450
0 1,377
720
0 2,036 1,060
0 2,825 1,450
0 3,742 1,925
0 4,782 2,450
0 5,955 3,050
0
0
2
68
852
560
93 1,244
850 124 1,713 1,130 161 2,256 1,480 202 2,868 1,890 264 3,556 2,340 319
4,322 2,840 378
5,153
3,390
5
112
839
547 149 1,229
829 192 1,696 1,105 243 2,238 1,461 300 2,849 1,871 382 3,536 2,318 458
4,301 2,818 540
5,132
3,371
10
142
817
525 187 1,204
795 238 1,669 1,080 298 2,209 1,430 364 2,818 1,840 459 3,504 2,280 546
4,268 2,780 641
5,099
3,340
0
0 1,596
840
2
63 1,019
675
5
0 2,380 1,240
86 1,495
0 3,323 1,720
0 4,423 2,270
0 5,678 2,900
0 7,099 3,620
0
985 114 2,062 1,350 147 2,719 1,770 186 3,467 2,260 239 4,304 2,800 290
8,665 4,410
0 10,393
5,232 3,410 346
6,251
5,300
4,080
105 1,003
600 140 1,476
967 182 2,041 1,327 229 2,696 1,748 283 3,442 2,235 355 4,278 2,777 426
5,204 3,385 501
6,222
4,057
10
135
977
635 177 1,446
936 227 2,009 1,289 283 2,659 1,712 346 3,402 2,193 432 4,234 2,739 510
5,159 3,343 599
6,175
4,019
15
155
953
610 202 1,418
905 257 1,976 1,250 318 2,632 1,675 385 3,363 2,150 479 4,192 2,700 564
5,115 3,300 554
6,129
3,980
0
0 1,756
930
2
59 1,150
755
0 2,637 1,350
0 3,701 1,900
0 4,948 2,520
0 6,376 3,250
0 7,988 4,060
0
81 1,694 1,100 107 2,343 1,520 139 3,097 2,000 175 3,955 2,570 220 4,916 3,200 269
9,785 4,980
0 11,753
5,983 3,910 321
7,154
6,000
4,700
5
101 1,133
738 135 1,674 1,079 174 2,320 1,489 219 3,071 1,978 270 3,926 2,544 337 4,885 3,174 403
5,950 3,880 475
7,119
4,662
10
130 1,105
710 172 1,641 1,045 220 2,282 1,460 273 3,029 1,940 334 3,880 2,500 413 4,835 3,130 489
5,896 3,830 573
7,063
4,600
15
150 1,078
688 195 1,609 1,018 248 2,245 1,425 306 2,988 1,910 372 3,835 2,465 459 4,786 3,090 541
5,844 3,795 631
7,007
4,575
20
167 1,052
665 217 1,578
5,792 3,760 689
6,953
4,550
0 13,848
7,060
0 1,977 1,060
990 273 2,210 1,390 335 2,948 1,880 404 3,791 2,430 495 4,737 3,050 585
0 3,004 1,550
74 2,004 1,310
0 4,252 2,170
0 5,725 2,920
0 7,420 3,770
0 9,341 4,750
0 11,483 5,850
2
54 1,351
865
98 2,786 1,800 127 3,696 2,380 159 4,734 3,050 199 5,900 3,810 241
7,194 4,650 285
8,617
5,600
5
96 1,332
851 127 1,981 1,289 164 2,759 1,775 206 3,666 2,350 252 4,701 3,020 312 5,863 3,783 373
7,155 4,622 439
8,574
5,552
10
125 1,301
829 164 1,944 1,254 209 2,716 1,733 259 3,617 2,300 316 4,647 2,970 386 5,803 3,739 456
7,090 4,574 535
8,505
5,471
15
143 1,272
807 187 1,908 1,220 237 2,674 1,692 292 3,570 2,250 354 4,594 2,920 431 5,744 3,695 507
7,026 4,527 590
8,437
5,391
20
160 1,243
784 207 1,873 1,185 260 2,633 1,650 319 3,523 2,200 384 4,542 2,870 467 5,686 3,650 548
6,964 4,480 639
8,370
5,310
30
195 1,189
745 246 1,807 1,130 305 2,555 1,585 369 3,433 2,130 440 4,442 2,785 540 5,574 3,565 635
6,842 4,375 739
8,239
5,225
0 16,694
8,430
0 2,231 1,195
0 3,441 1,825
2
41 1,620 1,010
66 2,431 1,513
5
90 1,600
0 4,934 2,550
0 6,711 3,440
0 8,774 4,460
0 11,129 5,635
0 13,767 6,940
86 3,409 2,185 113 4,554 2,840 141 5,864 3,670 171 7,339 4,630 209
8,980 5,695 251 10,788
6,860
996 118 2,406 1,495 151 3,380 2,102 191 4,520 2,813 234 5,826 3,639 283 7,295 4,597 336
8,933 5,654 394 10,737
6,818
10
118 1,567
972 154 2,366 1,466 196 3,332 2,064 243 4,464 2,767 295 5,763 3,585 355 7,224 4,542 419
8,855 5,585 491 10,652
6,749
15
136 1,536
948 177 2,327 1,437 222 3,285 2,026 274 4,409 2,721 330 5,701 3,534 396 7,155 4,511 465
8,779 5,546 542 10,570
6,710
20
151 1,505
924 195 2,288 1,408 244 3,239 1,987 300 4,356 2,675 361 5,641 3,481 433 7,086 4,479 506
8,704 5,506 586 10,488
6,670
0
183 1,446
876 232 2,214 1,349 287 3,150 1,910 347 4,253 2,631 412 5,523 3,431 494 6,953 4,421 577
8,557 5,444 672 10,328
6,603
0
100
982
NAT
FAN
Max Min Max
110
0
50
0 1,645
455 103
NAT
FAN
Max Min Max
128
0
30
570
NAT
FAN
Max Min Max
4
0
10
675
NAT
FAN
Max Min Max
6
0
8
0 1,121
75
Appliance Input Rating in Thousands of BTU per Hour
14”
16”
18”
20”
12”
0 2,491 1,310
0 3,925 2,050
0 5,729 2,950
0 7,914 4,050
0 10,485 5,300
0 13,454 6,700
0 16,817 8,600
0 20,578 10,300
2
30 1,975 1,170
44 3,027 1,830
72 4,313 2,550
95 5,834 3,500 120 7,591 4,600 138 9,577 5,800 169 11,803 7,200 204 14,264
8,800
5
82 1,955 1,159 107 3,002 1,803 136 4,282 2,531 172 5,797 3,475 208 7,548 4,566 245 9,528 5,769 293 11,748 7,162 341 14,204
8,756
10
108 1,923 1,142 142 2,961 1,775 180 4,231 2,500 223 5,737 3,434 268 7,478 4,509 318 9,447 5,717 374 11,658 7,100 436 14,105
8,683
15
126 1,892 1,124 163 2,920 1,747 206 4,182 2,469 252 5,678 3,392 304 7,409 4,451 358 9,367 5,665 418 11,569 7,037 487 14,007
8,610
20
141 1,861 1,107 181 2,880 1,719 226 4,133 2,438 277 5,619 3,351 330 7,341 4,394 387 9,289 5,613 452 11,482 6,975 523 13,910
8,537
30
170 1,802 1,071 215 2,803 1,663 265 4,037 2,375 319 5,505 3,267 378 7,209 4,279 446 9,136 5,509 514 11,310 6,850 592 13,720
8,391
50
241 1,688 1,000 292 2,657 1,550 350 3,856 2,250 415 5,289 3,100 486 6,956 4,050 572 8,841 5,300 659 10,979 6,600 752 13,354
8,100
Engineering Manual
45
TABLE 22
Height
Lateral
Capacity of Type B Double-Wall Gas Vents
H
(ft)
L
(ft)
6
8
10
15
20
30
50
100
3”
(with single-wall metal connectors serving
a single Category 1 appliance)
Appliance Input Rating in Thousands of BTU per Hour
5”
6”
7”
8”
9”
4”
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max
FAN
NAT
Min Max Max
10”
12”
FAN
NAT
Min Max Max
FAN
NAT
Min Max Max
0
38
77
45 59
151
85 85
249
140 126 373
204 165 522
284
211
695 369 267
894
469 371 1,118
569
537 1,639
849
2
39
51
36 60
96
66 85
156
104 123 231
156 159 320
213 201
423 284 251
541
368 347
453
498
648
673
979
4
NA
NA
33 74
92
63 102 152
102 146 225
152 187 313
208 237
416 277 295
533
360 409
664
443
584
971
638
6
NA
NA
31 83
89
60 114 147
99 163 220
148 207 307
203 263
409 271 327
526
352 449
656
433
638
962
627
0
37
83
50 58
164
93 83
273
154 123 412
234 161 580
319 206
777 414 258 1,002
536 360 1,257
658
521 1,852
967
2
39
56
39 59
108
75 83
176
119 121 261
179 155 363
246 197
482 321 246
417 339
513
486 1,120
743
617
768
5
NA
NA
37 77
102
69 107 168
114 151 252
171 193 352
235 245
470 311 305
604
404 418
754
500
598 1,104
730
8
NA NA
33 90
95
64 122 161
107 175 243
163 223 342
225 280
458 300 344
591
392 470
740
486
665 1,089
715
0
37
53 57
174
99 82
293
165 120 444
254 158 628
344 202
844 449 253 1,093
584 351 1,373
718
507 2,031 1,057
87
2
39
61
41 59
117
80 82
193
128 119 287
194 153 400
272 193
531 354 242
681
456 332
849
559
475 1,242
848
5
52
56
39 76
111
76 105 185
122 148 277
186 190 388
261 241
518 344 299
667
443 409
834
544
584 1,224
825
10
NA NA
34 97
100
112 188 261
171 237 369
241 296
497 325 363
643
423 492
808
520
688 1,194
788
0
36
93
57 56
190
111 80
325
186 116 499
283 153 713
388 195
966 523 244 1,259
681 336 1,591
838
488 2,374 1,237
2
38
69
47 57
136
93 80
225
149 115 337
224 148 473
314 187
631 413 232
543 319 1,015
673
457 1,491
68 132 171
812
983
5
51
63
44 75
128
86 102 216
140 144 326
217 182 459
298 231
616 400 287
795
526 392
997
657
562 1,469
963
10
NA
NA
39 95
116
79 128 201
131 182 308
203 228 438
284 284
592 381 349
768
501 470
966
628
664 1,433
928
15
NA
NA
NA NA
NA
72 158 186
124 220 290
192 272 418
269 334
568 367 404
742
484 540
937
601
750 1,399
894
0
35
96
60 54
200
118 78
346
201 114 537
306 149 772
428 190 1,053 573 238 1,379
750 326 1,751
927
473 2,631 1,346
2
37
74
50 56
148
99 78
248
165 113 375
248 144 528
344 182
708 468 227
914
611 309 1,146
754
443 1,689 1,098
5
50
68
47 73
140
94 100 239
158 141 363
239 178 514
334 224
692 457 279
896
596 381 1,126
734
547 1,665 1,074
10
NA
NA
41 93
129
86 125 223
146 177 344
224 222 491
316 277
666 437 339
866
570 457 1,092
702
646 1,626 1,037
15
NA
NA
NA NA
NA
80 155 208
136 216 325
210 264 469
301 325
640 419 393
838
549 526 1,060
677
730 1,587 1,005
20
NA
NA
NA NA
NA
NA 186 192
126 254 306
196 309 448
285 374
616 400 448
810
526 592 1,028
651
808 1,550
0
34
99
63 53
211
127 76
372
219 110 584
334 144 849
472 184 1,168 647 229 1,542
852 312 1,971 1,056
2
37
80
56 55
164
111 76
281
183 109 429
279 139 610
392 175
823 533 219 1,069
698 296 1,346
863
424 1,999 1,308
5
49
74
52 72
157
106 98
271
173 136 417
271 171 595
382 215
806 521 269 1,049
684 366 1,324
846
524 1,971 1,283
973
454 2,996 1,545
10
NA
NA
NA 91
144
98 122 255
168 171 397
257 213 570
367 265
777 501 327 1,017
662 440 1,287
821
620 1,927 1,243
15
NA
NA
NA 115 131
NA 151 239
157 208 377
242 255 547
349 312
750 481 379
638 507 1,251
794
702 1,884 1,205
985
20
NA
NA
NA NA
NA
NA 181 223
NA 246 357
228 298 524
333 360
723 461 433
955
615 570 1,216
768
780 1,841 1,166
30
NA
NA
NA NA
NA
NA NA
NA
NA NA NA
NA 389 477
305 461
670 426 541
895
574 704 1,147
720
937 1,759 1,101
0
33
99
66 51
213
133 73
394
230 105 629
361 138 928
515 176 1,292 704 220 1,724
948 295 2,223 1,189
428 3,432 1,818
2
36
84
61 53
181
121 73
318
205 104 495
312 133 712
443 168
971 613 209 1,273
811 280 1,615 1,007
401 2,426 1,509
5
48
80
NA 70
174
117 94
308
198 131 482
305 164 696
435 204
953 602 257 1,252
795 347 1,591
496 2,396 1,490
991
10
NA
NA
NA 89
160
NA 118 292
186 162 461
292 203 671
420 253
923 583 313 1,217
765 418 1,551
963
589 2,347 1,455
15
NA
NA
NA 112 148
NA 145 275
174 199 441
280 244 646
405 299
894 562 363 1,183
736 481 1,512
934
668 2,299 1,421
20
NA
NA
NA NA
NA
NA 176 257
NA 236 420
267 285 622
389 345
866 543 415 1,150
708 544 1,473
906
741 2,251 1,387
30
NA
NA
NA NA
NA
NA NA
NA 315 376
NA 373 573
NA 442
809 502 521 1,086
649 674 1,399
848
892 2,159 1,318
NA
0
NA
NA
NA 49
214
NA 69
403
NA 100 659
395 131 991
555 166 1,404 765 207 1,900 1,033 273 2,479 1,300
395 3,912 2,042
2
NA
NA
NA 51
192
NA 70
351
NA 98
563
373 125 828
508 158 1,152 698 196 1,532
933 259 1,970 1,168
571 3,021 1,817
5
NA
NA
NA 67
186
NA 90
342
NA 125 551
366 156 813
501 194 1,134 688 240 1,511
921 322 1,945 1,153
460 2,990 1,796
10
NA
NA
NA 85
175
NA 113 324
NA 153 532
354 191 789
486 238 1,104 672 293 1,477
902 389 1,905 1,133
547 2,938 1,763
15
NA
NA
NA 132 162
NA 138 310
NA 188 511
343 230 764
473 281 1,075 656 342 1,443
884 447 1,865 1,110
618 2,888 1,730
20
NA
NA
NA NA
NA
NA 168 295
NA 224 487
NA 270 739
458 325 1,046 639 391 1,410
864 507 1,825 1,087
690 2,838 1,696
824 631 1,747 1,041
834 2,739 1,627
30
NA
NA
NA NA
NA
NA 231 264
NA 301 448
NA 355 685
NA 418
988
NA 491 1,343
50
NA
NA
NA NA
NA
NA NA
NA NA
NA 540 584
NA 617
866
NA 711 1,205
46 www.bockwaterheaters.com
NA
NA
NA 895 1,591
NA 1,138 2,547 1,489
Engineering Manual
TABLE 23
Capacity of Masonry Chimney Flue with Type B Double-Wall Vent Connectors
(serving a single Category 1 appliance)
Height
Lateral
Type B Double-Wall Connector Diameter – D
(to be used with chimney areas within the size limits at bottom)
H
(ft)
L
(ft)
6
8
10
15
20
30
50
3”
Appliance Input Rating in Thousands of BTU per Hour
5”
6”
7”
8”
9”
4”
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max
2
NA
NA
28
NA
NA
52
NA
NA
86
NA
NA 130
NA
NA 180
NA
NA 247
NA
5
NA
NA
25
NA
NA
49
NA
NA
82
NA
NA 117
NA
NA 165
NA
NA 231
2
NA
NA
29
NA
NA
55
NA
NA
93
NA
NA 145
NA
NA 198
NA
NA 266
5
NA
NA
26
NA
NA
52
NA
NA
88
NA
NA 134
NA
NA 183
NA
8
NA
NA
24
NA
NA
48
NA
NA
83
NA
NA 127
NA
NA 175
NA
2
NA
NA
31
NA
NA
61
NA
NA 103
NA
NA 162
NA
NA 221
NAT
Max
NA
320
NA
NA
298
84
590
350
NA 247
NA
NA
328
NA 239
NA
NA
68 519 298
82
655
10”
FAN
Min Max
NA
12”
NAT
Max
FAN
Min Max
NAT
Max
NA
401
NA
NA
581
NA
NA
376
100
728
446
139 1,024
NA
NA
561
651
149
711
423
201 1,007
640
318
173
695
410
231
990
623
388
98
810
491
136 1,144
724
5
NA
NA
28
NA
NA
57
NA
NA
96
NA
NA 148
NA
NA 204
NA
NA 277 124
638
365
146
791
466
196 1,124
712
10
NA
NA
25
NA
NA
50
NA
NA
87
NA
NA 139
NA
NA 191
NA
NA 263 155
610
347
182
762
444
240 1,093
668
2
NA
NA
35
NA
NA
67
NA
NA 114
NA
NA 179
53 475 250
64 613 336
77
779
441
92
968
562
127 1,376
841
99 594 313
5
NA
NA
35
NA
NA
62
NA
NA 107
NA
NA 164
NA
NA 231
118
759
416
139
946
533
186 1,352
828
10
NA
NA
28
NA
NA
55
NA
NA
97
NA
NA 153
NA
NA 216 126 565 296 148
727
394
173
912
567
229 1,315
777
15
NA
NA
NA
NA
NA
48
NA
NA
89
NA
NA 141
NA
NA 201
698
375
198
880
485
259 1,280
742
2
NA
NA
38
NA
NA
74
NA
NA 124
NA
NA 201
51 522 274
61 678 375
73
867
491
87 1,083
627
121 1,548
953
95 658 350
NA
NA 281 171
5
NA
NA
36
NA
NA
68
NA
NA 116
NA
NA 184
80 503 254
113
845
463
133 1,059
597
179 1,523
933
10
NA
NA
NA
NA
NA
60
NA
NA 107
NA
NA 172
NA
NA 237 122 627 332 143
811
440
167 1,022
566
221 1,482
879
15
NA
NA
NA
NA
NA
NA
NA
NA
97
NA
NA 159
NA
NA 220
NA
NA 314 165
780
418
191
987
541
251 1,443
840
20
NA
NA
NA
NA
NA
NA
NA
NA
83
NA
NA 148
NA
NA 206
NA
NA 296 186
750
397
214
955
513
277 1,406
807
2
NA
NA
41
NA
NA
82
NA
NA 137
NA
NA 216
47 581 303
57 762 421
985
558
81 1,240
717
111 1,793 1,112
68
5
NA
NA
NA
NA
NA
76
NA
NA 128
NA
NA 198
75 561 281
90 741 393 106
962
526
125 1,216
683
169 1,766 1,094
10
NA
NA
NA
NA
NA
67
NA
NA 115
NA
NA 184
NA
NA 263 115 709 373 135
927
500
138 1,176
648
210 1,721 1,025
15
NA
NA
NA
NA
NA
NA
NA
NA 107
NA
NA 171
NA
NA 243
NA 353 156
893
476
181 1,139
621
239 1,679
860
450
203 1,103
592
264 1,638
940
NA
416
249 1,035
555
318 1,560
877
NA
20
NA
NA
NA
NA
NA
NA
NA
NA
91
NA
NA 159
NA
NA 227
NA
NA 332 176
30
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA 188
NA
NA 288
NA
NA
981
2
NA
NA
NA
NA
NA
92
NA
NA 161
NA
NA 251
NA
NA 351
51 840 477
61 1,106
633
72 1,413
812
99 2,080 1,243
5
NA
NA
NA
NA
NA
NA
NA
NA 151
NA
NA 230
NA
NA 323
83 819 445
98 1,083
596
116 1,387
774
155 2,052 1,225
195 2,006 1,147
10
NA
NA
NA
NA
NA
NA
NA
NA 138
NA
NA 215
NA
NA 304
NA
NA 424 126 1,047
567
147 1,347
733
15
NA
NA
NA
NA
NA
NA
NA
NA 127
NA
NA 199
NA
NA 282
NA
NA 400 146 1,010
539
170 1,307
702
222 1,961 1,099
20
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA 185
NA
NA 264
NA
NA 376 165
977
511
190 1,269
669
246 1,916 1,050
30
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA 327
NA
468
233 1,196
623
295 1,832
NA
NA
NA
Minimum
internal
area
of chimney
in sq.
inches
12
19
28
38
50
63
78
95
132
Maximum
internal
area
of chimney
in sq.
inches
49
88
137
198
269
352
445
550
792
Engineering Manual
984
47
TABLE 24
Capacity of Masonry Chimney Flue with Single-Wall Vent Connectors
(serving a single Category 1 appliance)
Height
Lateral
Single-Wall Metal Connector Diameter – D
(to be used with chimney areas within the size limits at bottom)
H
(ft)
L
(ft)
6
8
10
15
20
30
50
2
3”
FAN
Appliance Input Rating in Thousands of BTU per Hour
5”
6”
7”
8”
9”
4”
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min
NA
NA
28
NA
NA
52
NA
NA
86
NA
NA 130
NA
NA 180
NA
NA 247
NA
NAT
Max
10”
FAN
Max
Min
NA 319
NA
NA
12”
NAT
Max
Max
NA 400
Min
NAT
Max
NA
NA
NA
Max
580
5
NA
NA
25
NA
NA
48
NA
NA
81
NA
NA 116
NA
NA 164
NA
NA 230
NA
NA 297
2
NA
NA
29
NA
NA
55
NA
NA
93
NA
NA 145
NA
NA 197
NA
NA 265
NA
NA 349 382
5
NA
NA
26
NA
NA
51
NA
NA
87
NA
NA 133
NA
NA 182
NA
NA 246
NA
NA 327
8
NA
NA
23
NA
NA
47
NA
NA
82
NA
NA 126
NA
NA 174
NA
NA 237
NA
NA 317
2
NA
NA
31
NA
NA
61
NA
NA 102
NA
NA 161
NA
NA 220 216 518 297 271
654
387 373
808
490
536 1,142
722
5
NA
NA
28
NA
NA
56
NA
NA
95
NA
NA 147
NA
NA 203
NA
635
364 459
789
465
657 1,121
710
NA
NA 189
NA
NA 345 547
758
441
771 1,088
665
965
560
520 1,373
840
NA 276 334
NA 261
NA
NA 375
FAN
NA
560
445
549 1,021
650
NA
NA 422
673 1,003
638
NA
NA 408
747
621
725
985
10
NA
NA
24
NA
NA
49
NA
NA
86
NA
NA 137
2
NA
NA
35
NA
NA
67
NA
NA 113
NA
NA 178 166 473 249 211
5
NA
NA
32
NA
NA
61
NA
NA 106
NA
NA 163
NA
NA 230 261 591 312 325
755
414 444
942
531
637 1,348
825
10
NA
NA
27
NA
NA
54
NA
NA
96
NA
NA 151
NA
NA 214
NA
NA 294 392
722
392 531
907
504
749 1,309
774
NA
NA 198
NA
611 335 264
776
440 362
15
NA
NA
NA
NA
NA
46
NA
NA
87
NA
NA 138
NA 278 452
692
372 606
873
481
841 1,272
738
2
NA
NA
38
NA
NA
73
NA
NA 123
NA
NA 200 163 520 273 206 675 374 258
864
490 252 1,079
625
508 1,544
950
5
NA
NA
35
NA
NA
67
NA
NA 115
NA
NA 183
NA
NA 252 255 655 348 317
842
461 433 1,055
594
623 1,518
930
10
NA
NA
NA
NA
NA
59
NA
NA 105
NA
NA 170
NA
NA 235 312 622 330 382
806
437 517 1,016
562
733 1,475
875
773
414 591
979
539
823 1,435
835
NA 392 663
944
510
911 1,394
800
15
NA
NA
NA
NA
NA
NA
NA
NA
95
NA
NA 156
NA
NA 217
NA
NA 311 442
20
NA
NA
NA
NA
NA
NA
NA
NA
80
NA
NA 144
NA
NA 202
NA
NA 292
2
NA
NA
41
NA
NA
81
NA
NA 136
NA
NA 215 158 578 302 200 759 420 249
982
556 340 1,237
715
489 1,789 1,110
5
NA
NA
NA
NA
NA
75
NA
NA 127
NA
NA 196
NA
NA 279 245 737 391 306
958
524 417 1,210
680
600 1,760 1,090
10
NA
NA
NA
NA
NA
66
NA
NA 113
NA
NA 182
NA
NA 260 300 703 370 370
920
496 500 1,168
644
708 1,713 1,020
15
NA
NA
NA
NA
NA
NA
NA
NA 105
NA
NA 168
NA
NA 240
NA
NA 349 428
884
471 572 1,128
615
798 1,668
975
20
NA
NA
NA
NA
NA
NA
NA
NA
88
NA
NA 155
NA
NA 223
NA
NA 327
NA
NA 445 643 1,089
585
883 1,624
932
30
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA 182
NA
NA 281
NA
NA 408
NA 544 1,055 1,539
865
2
NA
NA
NA
NA
NA
91
NA
NA 160
NA
NA 250
NA
NA 350 191 837 475 238 1,103
631 323 1,408
810
463 2,076 1,240
5
NA
NA
NA
NA
NA
NA
NA
NA 149
NA
NA 228
NA
NA 321
NA 442 293 1,078
593 398 1,381
770
571 2,044 1,220
NA
NA
NA
10
NA
NA
NA
NA
NA
NA
NA
NA 136
NA
NA 212
NA
NA 301
NA
NA 420 355 1,038
562 447 1,337
728
674 1,994 1,140
15
NA
NA
NA
NA
NA
NA
NA
NA 124
NA
NA 195
NA
NA 278
NA
NA 395
NA
NA 533 546 1,294
695
761 1,945 1,090
20
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA 180
NA
NA 258
NA
NA 370
NA
NA 504 616 1,251
660
844 1,898 1,040
30
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA 318
NA
NA 458
NA
NA
NA
NA 610 1,009 1,805
Minimum
internal area
of chimney
in sq. inches
12
19
28
38
50
63
78
95
132
Maximum
internal area
of chimney
in sq. inches
49
88
137
198
269
352
445
550
792
48 www.bockwaterheaters.com
970
Engineering Manual
TABLE 25
Capacity of Single-Wall Metal Pipe or Type B Cement Vents
(serving a single draft hood-equipped appliance)
Height Lateral
H
L
(ft)
(ft)
6
8
10
15
20
30
50
Appliance Input Rating in Thousands of BTU per Hour
Maximum Appliance Input Rating in Thousands of Btu per Hour
3”
4”
5”
6”
7”
8”
10”
0
39
70
116
170
232
312
500
12”
750
2
31
55
94
141
194
260
415
620
5
28
51
88
128
177
242
390
600
0
42
76
126
185
252
340
542
815
2
32
61
102
154
210
284
451
680
5
29
56
95
141
194
264
430
648
10
24
49
86
131
180
250
406
625
0
45
84
138
202
279
372
606
912
2
35
67
111
168
233
311
505
760
5
32
61
104
153
215
289
480
724
10
27
54
94
143
200
274
455
700
15
TABLE 26
Capacity of Single-Wall Metal Pipe
or Type B Cement Vents
(serving a two or more draft hood-equipped appliances)
Total
Vent Conn.
Height Rise
(ft)
(ft)
6-8
Maximum Appliance Rating
in Thousands of Btu per Hour
3”
4”
5”
6”
7”
8”
1
21
40
68
102
146
205
2
28
53
86
124
178
235
3
34
61
98
147
204
275
1
23
44
77
117
179
240
2
30
56
92
134
194
265
NA
46
84
130
186
258
432
666
0
49
91
151
223
312
420
684
1,040
2
39
72
122
186
260
350
570
865
3
35
64
102
155
216
298
5
35
825
1
25
49
84
129
190
270
10
30
58
103
158
223
308
514
795
2
31
58
97
145
211
295
15
NA
50
93
144
207
291
488
760
3
36
68
107
164
232
321
20
NA
NA
82
132
195
273
466
726
0
53
101
163
252
342
470
770
1,190
2
42
80
136
210
286
392
641
990
67
110
170
240
325
540
5
38
74
123
192
264
364
610
945
10
32
65
115
178
246
345
571
910
15
NA
55
104
163
228
326
550
870
20
NA
NA
91
149
214
306
525
832
0
56
108
183
276
384
529
878
1,370
2
44
84
148
230
320
441
730
1,140
5
NA
78
137
210
296
410
694
1,080
10
NA
68
125
196
274
388
656
1,050
15
NA
NA
113
177
258
366
625
1,000
20
NA
NA
99
163
240
344
596
960
30
NA
NA
NA
NA
192
295
540
890
0
NA
120
210
310
443
590
980
1,550
2
NA
95
171
260
370
492
820
1,290
5
NA
NA
159
234
342
474
780
1,230
10
NA
NA
146
221
318
456
730
1,190
15
NA
NA
NA
200
292
407
705
1,130
20
NA
NA
NA
185
276
384
670
1,080
30
NA
NA
NA
NA
222
330
605
1,010
Engineering Manual
15
30 &
UP
COMMON VENT CAPACITY
Total
Vent
Height
(ft)
6
Combined appliance input rating
in thousands of Btu per hour
4”
48
5”
78
6”
7”
8”
10”
111
155
205
320
12”
NA
8
55
89
128
175
234
365
505
10
59
95
136
190
250
395
560
15
71
115
168
228
305
480
690
20
80
129
186
260
340
550
790
30
NA
147
215
300
400
650
940
50
NA
NA
NA
360
490
810
1,190
49
TABLE 27
Capacity of Type B Double-Wall Vents with Type B Double-Wall Connectors
(serving two or more Category 1 Appliances)
Vent
Height
H
(ft)
3”
Appliance Input Rating Limit in Thousands of Btu per Hour
5”
6”
7”
8”
4”
9”
10”
Conn.
Rise
R
(ft)
Min
Max
Max
Min
Max
Max
Min
Max
Max
Min
Max
Max
Min
Max
Max
Min
Max
Max
Min
Max
Min
1
22
37
26
35
66
46
46
106
72
58
164
104
77
225
142
92
296
185
109
376 237
128
466
289
2
23
41
31
37
75
55
48
121
86
60
183
124
79
253
168
95
333
220
112
424 282
131
526
345
3
24
44
35
38
81
62
49
132
96
62
199
139
82
275
189
97
363
248
114
463 317
134
575
386
1
22
40
27
35
72
48
49
114
76
64
176
109
84
243
148
100
320
194
118
408 248
138
507
303
2
23
44
32
36
80
57
51
128
90
66
195
129
86
269
175
103
356
230
121
454 294
141
564
358
3
24
47
36
37
87
64
53
139
101
67
210
145
88
290
198
105
384
258
123
492 330
143
612
402
1
22
43
28
34
78
50
49
123
78
65
189
113
89
257
154
106
341
200
125
436 257
146
542
314
2
23
47
33
36
86
59
51
136
93
67
206
134
91
282
182
109
374
238
128
479 305
149
596
372
3
24
50
37
37
92
67
52
146
104
69
220
150
94
303
205
111
402
268
131
515 342
152
642
417
1
21
50
30
33
89
53
47
142
83
64
220
120
88
298
163
110
389
214
134
493 273
162
609
333
2
22
53
35
35
96
63
49
153
99
66
235
142
91
320
193
112
419
263
137
532 323
165
658
394
3
24
55
40
36
102
71
51
163
111
68
248
160
93
339
218
115
445
286
140
565 365
167
700
444
1
21
54
31
33
99
56
46
157
87
62
246
125
86
334
171
107
436
224
131
552 285
158
681
347
2
22
57
37
34
105
66
48
167
104
64
259
149
89
354
202
110
463
265
134
587 339
161
725
414
3
23
60
42
35
110
74
50
176
116
66
271
168
91
371
228
113
486
300
137
618 383
164
764
466
1
20
62
33
31
113
59
45
181
93
60
288
134
83
391
182
103
512
238
125
649 305
151
802
372
2
21
64
39
33
118
70
47
190
110
62
299
158
85
408
215
105
535
282
129
679 360
155
840
439
3
22
66
44
34
123
79
48
198
124
64
309
178
88
423
242
108
555
317
132
706 405
158
874
494
1
19
71
36
30
133
64
43
216
101
57
349
145
78
477
197
97
627
257
120
797 330
144
984
403
2
21
73
43
32
137
76
45
223
119
59
358
172
81
490
234
100
645
306
123
820 392
148 1,014
478
3
22
75
48
33
141
86
46
229
134
61
366
194
83
502
263
103
661
343
126
842 441
151 1,043
538
1
18
82
37
28
158
66
40
262
104
53
442
150
73
611
204
91
810
266
112 1,038 341
135 1,285
417
2
19
83
44
30
161
79
42
267
123
55
447
178
75
619
242
94
822
316
115 1,054 405
139 1,306
494
3
20
84
50
31
163
89
44
272
138
57
452
200
78
627
272
97
834
355
118 1,069 455
142 1,327
555
6
8
10
15
20
30
50
100
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
Max
FAN
Max
NAT
Max
Common Vent Capacity
Appliance Input Rating Limit in Thousands of Btu per Hour
Vent
Height
H
(ft)
4”
FAN
5”
NAT
FAN
6”
NAT
FAN
7”
NAT
FAN
8”
NAT
FAN
+FAN
9”
NAT
FAN
10”
NAT
+NAT
FAN
NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+NAT
+FAN
+FAN
+FAN
+FAN
6
92
81
65
140
116
103
204
161
147
309
248
200
404
314
260
547
434
335
672
520
+NAT
410
8
101
90
73
155
129
114
224
178
163
339
275
223
444
348
290
602
840
378
740
577
465
10
110
97
79
169
141
124
243
194
178
367
299
242
477
377
315
649
522
405
800
627
495
15
125
112
91
195
164
144
283
228
206
427
352
280
556
444
365
753
612
465
924
733
565
20
136
123
102
215
183
160
314
255
229
475
394
310
621
499
405
842
688
523
1,035
826
640
30
152
138
118
244
210
185
361
297
266
547
459
360
720
585
470
979
808
605
1,209
975
740
50
167
153
134
279
244
214
421
353
310
641
547
423
854
706
550
1,164
977
705
1,451 1,188
860
100
175
163
NA
311
277
NA
489
421
NA
751
658
479
1,025
873
625
1,408 1,215
800
1,784 1,502
975
50 www.bockwaterheaters.com
Engineering Manual
TABLE 27 ... continued
Vent Connector Capacity
Type B Double-Wall Vent and Connector Diameter – D
Vent
Height
H
(ft)
6
8
10
15
20
30
50
100
12”
14”
Appliance Input Rating Limit in Thousands of Btu per Hour
16”
18”
20”
22”
24”
Conn.
Rise
R
(ft)
Min
Min
Max
1
174
764
496
223
1,046
653 281
1,371
853 346
1,772 1,080
NA
NA
NA
NA
NA
NA
NA
NA
NA
2
180
897
616
230
1,231
827 287
1,617 1,081 352
2,069 1,370
NA
NA
NA
NA
NA
NA
NA
NA
NA
FAN
Nat
Max
FAN
Max
Nat
Max
NA
FAN
Min
Nat
Max
Max
Min
Max
Min
Nat
Max
FAN
Max
Min
Nat
Max
Max
FAN
Min
Nat
Max
Max
NA
NA
NA
NA
NA
NA
NA
186
822
516
238
1,126
696 298
1,478
2
192
952
644
244
1,307
884 305
1,719 1,150 372
2,211 1,460 471
2,737 1,800 560
3,319 2,180 662
3,957 2,590
3
198
1,050
772
252
1,445 1,072 313
1,902 1,390 380
2,434 1,770 478
3,018 2,180 568
3,665 2,640 669
4,373 3,130
1
196
870
536
249
1,195
730
1,570
2,049 1,205
2
201
997
664
256
1,371
924 318
1,804 1,205 387
2,332 1,535 486
2,887 1,890 581
3,502 2,280 686
4,175 2,710
3
207
1,095
792
263
1,509 1,118 325
1,989 1,455 395
2,556 1,865 494
3,169 2,290 589
3,849 2,760 694
4,593 3,270
1
214
967
568
272
1,334
790 336
1,760 1,030 408
2,317 1,305
2
221
1,085
712
279
1,499 1,006 344
1,978 1,320 416
2,579 1,665 523
3,197 2,060 624
3,881 2,490 734
4,631 2,960
3
228
1,181
856
286
1,632 1,222 351
2,157 1,610 424
2,796 2,025 533
3,470 2,510 634
4,216 3,030 743
5,035 3,600
1
223
1,051
596
291
1,443
1,911 1,095 430
2,533 1,385
2
230
1,162
748
298
1,597 1,064 365
2,116 1,395 438
2,778 1,765 554
3,447 2,180 661
4,190 2,630 772
5,005 3,130
3
237
1,253
900
307
1,726 1,288 373
2,287 1,695 450
2,984 2,145 567
3,708 2,650 671
4,511 3,190 785
5,392 3,790
1
216
1,217
632
286
1,664
910 367
2,183 1,190 461
2,891 1,540
2
223
1,316
792
294
1,802 1,160 376
2,366 1,510 474
3,110 1,920 619
3,840 2,365 728
4,861 2,860 847
5,606 3,410
4,080 2,875 741
4,976 3,480 860
5,961 4,150
910 365
955 379
NA
Max
FAN
1
840 357
NA
Nat
3
311
NA
FAN
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
1,920 1,150
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
3
231
1,400
592
303
1,920 1,410 384
2,524 1,830 485
3,299 2,340 632
1
206
1,479
689
273
2,023 1,007 350
2,659 1,315 435
3,548 1,665
2
213
1,561
860
281
2,139 1,291 359
2,814 1,685 447
3,730 2,135 581
4,601 2,633 709
5,569 3,185 851
6,633 3,790
3
221
1,631 1,031
290
2,242 1,575 369
2,951 2,055 461
3,893 2,605 594
4,808 3,208 724
5,826 3,885 867
6,943 4,620
1
192
1,923
712
254
2,644 1,050 326
3,490 1,370 402
4,707 1,740
2
200
1,984
888
263
2,731 1,346 336
3,606 1,760 414
4,842 2,220 523
5,982 2,750 639
7,254 3,330 769
8,650 3,950
3
208
2,035 1,064
272
2,811 1,642 346
3,714 2,150 426
4,968 2,700 539
6,143 3,350 654
7,453 4,070 786
8,892 4,810
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Common Vent Capacity
Combined Appliance Input Rating Limit in Thousands of Btu per Hour
12”
14”
16”
18”
20”
22”
24”
Vent
Height
FAN
Nat
FAN
Nat
FAN
Nat
FAN
Nat
FAN
Nat
FAN
Nat
FAN
Nat
H
+FAN +FAN +NAT +FAN +FAN +NAT +FAN +FAN +NAT +FAN +FAN +NAT +FAN +FAN +NAT +FAN +FAN +NAT +FAN +FAN +NAT
(ft)
6
900
696
588
1,284
990
815
1,735 1,336 1,065
2,253 1,732 1,345
2,838 2,180 1,660
3,488 2,677 1,970
4,206 3,226 2,390
8
994
773
652
1,423 1,103
912
1,927 1,491 1,190
2,507 1,936 1,510
3,162 2,439 1,860
3,890 2,998 2,220
4,695 3,616 2,680
10
1,076
841
712
1,342 1,200
995
2,093 1,625 1,300
2,727
2,113 1,645
3,444 2,665 2,030
4,241 3,278 2,400
5,123 3,957 2,920
15
1,247
986
825
1,794 1,410 1,158
2,440 1,910 1,510
3,184 2,484 1,910
4,026 3,133 2,360
4,971 3,862 2,790
6,016 4,670 3,400
20
1,405
1,116
916
2,006 1,588 1,290
2,722 2,147 1,690
3,561 2,798 2,140
4,548 3,552 2,640
5,573 4,352 3,120
6,749 5,261 3,800
30
1,658 1,327 1,025
2,373 1,892 1,525
3,220 2,558 1,990
4,197 3,326 2,520
5,303 4,193 3,110
6,539 5,157 3,680
7,940 6,247 4,480
50
2,024 1,640 1,280
2,911 2,347 1,863
3,964 3,183 2,430
5,184 4,149 3,075
6,567 5,240 3,800
8,116 6,458 4,500
9,837 7,813 5,475
100
2,569 2,131 1,670
3,732 3,076 2,450
5,125 4,202 3,200
6,749 5,509 4,050
8,597 6,986 5,000 10,681 8,648 5,920 13,004 10,499 7,200
Engineering Manual
51
TABLE 28
Capacity of Type B Double-Wall Vent with Single-Wall Connectors
(serving two or more Category 1 Appliances)
Vent
Height
H
(ft)
3”
4”
Appliance Input Rating Limit in Thousands of Btu per Hour
5”
6”
7”
8”
9”
10”
Conn.
Rise
R
(ft)
Min
Max Max
Min
Max Max
Min
Max Max
Min
Max Max
Min
Max Max
Min
Max Max
Min
Max Max
Min
Max Max
1
NA
NA
26
NA
NA
46
NA
NA
71
NA
NA
102
207
223
140
262
293
183
325
373
234
447
463
286
2
NA
NA
31
NA
NA
55
NA
NA
85
168
182
123
215
251
167
271
331
219
334
422
281
458
524
344
3
NA
NA
34
NA
NA
62
121
131
95
175
198
138
222
273
188
279
361
247
344
462
316
468
574
385
1
NA
NA
27
NA
NA
48
NA
NA
75
NA
NA
106
226
240
145
285
316
191
352
403
244
481
502
299
2
NA
NA
32
NA
NA
57
125
126
89
184
193
127
234
266
173
293
353
228
360
450
292
492
560
355
3
NA
NA
35
NA
NA
64
130
138
100
191
208
144
241
287
197
302
381
256
370
489
328
501
609
400
1
NA
NA
28
NA
NA
50
119
121
77
182
186
110
240
253
150
302
335
196
372
429
252
506
534
308
2
NA
NA
33
84
85
59
124
134
91
189
203
132
248
278
183
311
369
235
381
473
302
517
589
368
6
8
10
15
20
30
50
100
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
3
NA
NA
36
89
91
67
129
144
102
197
217
148
257
299
203
320
398
265
391
511
339
528
637
413
1
NA
NA
29
79
87
52
116
138
81
177
214
116
238
291
158
312
380
208
397
482
266
556
596
324
2
NA
NA
34
83
94
62
121
150
97
185
230
138
246
314
189
321
411
248
407
522
317
568
646
387
3
NA
NA
39
87
100
70
127
160
109
193
243
157
255
333
215
331
438
281
418
557
360
579
690
437
1
49
56
30
78
97
54
115
152
84
175
238
120
233
325
165
306
425
217
390
538
276
546
664
336
2
52
59
36
82
103
64
120
163
101
182
252
144
243
346
197
317
453
259
400
574
331
558
709
403
3
55
62
40
87
107
72
125
172
113
190
264
164
252
363
223
326
476
294
412
607
375
570
750
457
1
47
60
31
77
110
57
112
175
89
169
278
129
226
380
175
296
497
230
378
630
294
528
779
358
2
51
62
37
81
115
67
117
185
106
177
290
152
236
397
208
307
521
274
389
662
349
541
819
425
3
54
64
42
85
119
76
122
193
120
185
300
172
244
412
235
316
542
309
400
690
394
555
855
482
1
46
69
34
75
128
60
109
207
96
162
336
137
217
460
188
284
604
245
364
768
314
507
951
384
2
49
71
40
79
132
72
114
215
113
170
345
164
226
473
223
294
623
293
376
793
375
520
983
458
3
52
72
45
83
136
82
119
221
123
178
353
186
235
486
252
304
640
331
387
816
423
535 1,013 518
1
45
79
34
71
150
61
104
249
98
153
424
140
205
585
192
269
774
249
345
993
321
476 1,236 393
2
48
80
41
75
153
73
110
255
115
160
428
167
212
593
228
279
788
299
358 1,011 383
490 1,259 469
3
51
81
46
79
157
85
114
260
129
168
433
190
222
603
256
289
801
339
368 1,027 431
506 1,280 527
Common Vent Capacity
Combined Appliance Input Rating Limit in Thousands of Btu per Hour
4”
5”
6”
7”
8”
9”
10”
Vent
Height
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
H
(ft)
+FAN +FAN +NAT +FAN +FAN +NAT +FAN +FAN +NAT +FAN +FAN +NAT +FAN +FAN +NAT +FAN +FAN +NAT +FAN +FAN +NAT
6
NA
78
64
NA
113
99
200
158
144
304
244
196
398
310
257
541
429
332
665
515
407
8
NA
87
71
NA
126
111
218
173
159
331
269
218
436
342
285
592
473
373
730
569
460
10
NA
94
76
163
137
120
237
189
174
357
292
236
467
369
309
638
512
398
787
617
487
15
121
108
88
189
159
140
275
221
200
416
343
274
544
434
357
738
599
456
905
718
553
20
131
118
98
208
177
156
305
247
223
463
383
302
606
487
395
824
673
512
1,013
808
626
30
145
132
113
236
202
180
350
286
257
533
446
349
703
570
459
958
790
593
1,183
952
723
50
159
145
128
268
233
208
406
337
296
622
529
410
833
686
535
1,139
954
689
1,418 1,157
838
100
166
153
NA
297
263
NA
469
398
NA
726
633
464
999
846
606
1,378 1,185
780
1,741 1,459
948
52 www.bockwaterheaters.com
Engineering Manual
TABLE 29
Capacity of Masonry Chimney with Type B Double-Wall Connectors
(serving two or more Category 1 Appliances)
Vent
Height
H
(ft)
3”
4”
Conn.
Rise
R
(ft)
Min
1
24
33
21
39
62
2
26
43
28
41
3
27
49
34
1
24
39
2
26
47
3
27
1
6
8
10
15
20
30
50
100
FAN
Appliance Input Rating Limit in Thousands of Btu per Hour
5”
6”
7”
8”
NAT
Max Max
FAN
Min
NAT
Max Max
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
9”
FAN
10”
NAT
FAN
NAT
Min
Max Max
Min
Max Max
Min
Max Max
Min
Max Max
Min
Max Max
Min
Max Max
40
52
106
67
65
194
101
87
274
141
104
370
201
124
479
253
145
599
319
79
52
53
133
85
67
230
124
89
324
173
107
436
232
127
562
300
148
694
378
42
92
61
55
155
97
69
262
143
91
369
203
109
491
270
129
633
349
151
795
439
22
39
72
41
55
117
69
71
213
105
94
304
148
113
414
210
134
539
267
156
682
335
29
40
87
53
57
140
86
73
246
127
97
350
179
116
473
240
137
615
311
160
776
394
52
34
42
97
62
59
159
98
75
269
145
99
383
206
119
517
276
139
672
358
163
848
452
24
42
22
38
80
42
55
130
71
74
232
108
101
324
153
120
444
216
142
582
277
165
739
348
2
26
50
29
40
93
54
57
153
87
76
261
129
103
366
184
123
498
247
145
652
321
168
825
407
3
27
55
35
41
105
63
58
170
100
78
284
148
106
397
209
126
540
281
147
705
366
171
893
463
1
24
48
23
38
93
44
54
154
74
72
277
114
100
384
164
125
511
229
153
658
297
184
824
375
2
25
55
31
39
105
55
56
174
89
74
299
134
103
419
192
128
558
260
156
718
339
187
900
432
3
26
59
35
41
115
64
57
189
102
76
319
153
105
448
215
131
597
292
159
760
382
190
960
486
1
24
52
24
37
102
46
53
172
77
71
313
119
98
437
173
123
584
239
130
752
312
180
943
397
2
25
58
31
39
114
56
55
190
91
73
335
138
101
467
199
126
625
270
153
805
354
184 1,011 452
3
26
63
35
40
123
65
57
204
104
75
353
157
104
493
222
129
661
301
156
851
396
187 1,067 505
1
24
54
25
37
111
48
52
192
82
69
357
127
96
504
187
119
680
255
145
883
337
175 1,115 432
2
25
60
32
38
122
58
54
208
95
72
376
145
99
531
209
122
715
287
149
928
378
179 1,171 484
3
26
64
36
40
131
66
56
221
107
74
392
163
101
554
233
125
746
317
152
968
418
182 1,220 535
1
23
51
25
36
116
51
51
209
89
67
405
143
92
582
213
113
798
294
140 1,049 392
168 1,334 506
2
24
59
32
37
127
61
53
225
102
70
421
161
95
604
235
118
827
326
143 1,085 433
172 1,379 558
3
26
64
36
39
135
69
55
237
115
72
435
180
98
624
260
121
854
357
147 1,118 474
176 1,421 611
1
23
46
24
35
108
50
49
208
92
65
428
155
88
640
237
109
907
334
134 1,222 454
161 1,589 596
2
24
53
31
37
120
60
51
224
105
67
444
174
92
660
260
113
933
368
138 1,253 497
165 1,626 651
3
25
39
35
38
130
68
53
237
118
69
458
193
94
679
285
116
956
399
141 1,282 540
169 1,661 705
Common Vent Capacity
Minimum Internal Area of Masonry Chimney Flue (in2)
Combined Appliance Input Rating Limit in Thousands of Btu per Hour
12”
19”
28”
38”
50”
63”
78”
113”
Vent
Height
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
H
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
(ft)
6
NA
74
25
NA
119
46
NA
178
71
NA
257
8
NA
80
28
NA
130
53
NA
193
82
NA
279
119
NA
384
10
NA
84
31
NA
138
56
NA
207
90
NA
299
131
NA
409
15
NA
NA
36
NA
152
67
NA
233
106
NA
334
152
523
467
20
NA
NA
41
NA
NA
75
NA
250
122
NA
368
172
565
30
NA
NA
NA
NA
NA
NA
NA
270
137
NA
404
198
50
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
100
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Engineering Manual
103
NA
351
143
NA
458
188
NA
582 246
1,041
853
NA
163
NA
501
218
724
636 278
1,144
937
408
177
606
538
236
776
686 302
1,226 1,010
454
212
682
611
283
874
781 365
1,374 1,156
546
508
243
742
668
325
955
858 419
1,513 1,286
648
615
564
278
816
747
381 1,062
969 496
1,702 1,473
749
NA
NA
620
328
879
831
461 1,165 1,089 606
1,905 1,692
922
NA
NA
NA
348
NA
NA
499
2,053 1,921 1,058
NA
NA 669
53
TABLE 30
Capacity of Masonry Chimney with Single-Wall Connectors
(serving two or more Category 1 Appliances)
Single-Wall Metal Vent Connector Diameter – D
Vent
Height
H
(ft)
3”
Appliance Input Rating Limit in Thousands of Btu per Hour
5”
6”
7”
8”
4”
Conn.
Rise
R
(ft)
Min
Max Max
1
NA
NA
21
NA
NA
39
NA
NA
2
NA
NA
28
NA
NA
52
NA
3
NA
NA
34
NA
NA
61
134
6
8
10
15
20
30
50
100
FAN
NAT
FAN
Min
NAT
Max Max
FAN
Min
NAT
Max Max
FAN
NAT
FAN
NAT
FAN
NAT
9”
FAN
10”
NAT
FAN
NAT
Min
Max Max
Min
Max Max
Min
Max Max
Min
Max Max
Min
Max Max
66
179
191
100
231
271
140
292
366
200
362
474 252
499
594 316
NA
84
186
227
123
239
321
172
301
432
231
373
557 299
509
696 376
153
97
193
258
142
247
365
202
309
491
269
381
634 348
519
793 437
1
NA
NA
21
NA
NA
40
NA
NA
68
195
208
103
250
298
146
313
407
207
387
530 263
529
672 331
2
NA
NA
28
NA
NA
52
137
139
85
202
240
125
258
343
177
323
465
238
397
607 309
540
766 391
3
NA
NA
34
NA
NA
62
143
156
98
210
264
145
266
376
205
332
509
274
407
663 356
551
838 450
1
NA
NA
22
NA
NA
41
130
151
70
202
225
106
267
316
151
333
434
213
410
571 273
558
727 343
2
NA
NA
29
NA
NA
53
136
150
86
210
255
128
276
358
181
343
489
244
420
640 317
569
813 403
3
NA
NA
34
97
102
62
143
166
99
217
277
147
284
389
207
352
530
279
430
694 363
580
880 459
1
NA
NA
23
NA
NA
43
129
151
73
199
271
112
268
376
161
349
502
225
445
646 291
623
808 366
2
NA
NA
30
92
103
54
135
170
88
207
295
132
277
411
189
359
548
256
456
706 334
634
884 424
3
NA
NA
34
96
112
63
141
185
101
215
315
151
286
439
213
368
586
289
466
755 378
646
945 479
1
NA
NA
23
87
99
45
128
167
76
197
303
117
265
425
169
345
569
235
439
734 306
614
921 387
2
NA
NA
30
91
111
55
134
185
90
205
325
136
274
455
195
355
610
266
450
717 348
627
986 443
3
NA
NA
35
96
119
64
140
199
103
213
343
154
282
481
219
365
644
298
461
831 391
639 1,042 496
1
NA
NA
24
86
108
47
126
187
80
193
347
124
259
492
183
338
665
250
430
864 330
600 1,089 421
2
NA
NA
31
91
119
57
132
203
93
201
366
142
269
518
205
348
699
282
442
908 372
613 1,145 473
3
NA
NA
35
95
127
65
138
216
105
209
381
160
277
540
229
358
729
312
452
946 412
626 1,193 524
1
NA
NA
24
85
113
50
124
204
87
188
392
139
252
567
208
328
778
287
417 1,022 383
582 1,302 492
2
NA
NA
31
89
123
60
130
218
100
196
408
158
262
588
230
339
806
320
429 1,058 425
596 1,346 545
3
NA
NA
35
94
131
68
136
231
112
205
422
176
271
607
255
349
831
351
440 1,090 466
610 1,386 597
1
NA
NA
23
84
104
49
122
200
89
182
410
151
243
617
232
315
875
328
402 1,181 444
560 1,537 580
2
NA
NA
30
88
115
59
127
215
102
190
425
169
253
636
254
326
899
361
415 1,210 488
575 1,570 634
3
NA
NA
34
93
124
67
133
228
115
199
438
188
262
654
279
337
921
392
427 1,238 529
589 1,604 687
Common Vent Capacity
Minimum internal area of masonry chimney flue (in2)
Combined Appliance Input Rating Limit in Thousands of Btu per Hour
12”
19”
28”
38”
50”
63”
78”
113”
Vent
Height
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
FAN
NAT
H
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
+FAN
+FAN
+NAT
(ft)
6
NA
NA
25
NA
118
45
NA
176
71
NA
255
102
NA
348
142
NA
455
187
NA
579
245
NA
846
NA
8
NA
NA
28
NA
128
52
NA
190
81
NA
276
118
NA
380
162
NA
497
217
NA
633
277 1,136
928
405
10
NA
NA
31
NA
136
56
NA
205
89
NA
295
129
NA
405
175
NA
532
234
771
680
300 1,216 1,000
450
15
NA
NA
36
NA
NA
66
NA
230
105
NA
335
150
NA
400
210
677
602
280
866
772
360 1,359 1,139
540
20
NA
NA
NA
NA
NA
74
NA
247
120
NA
362
170
NA
503
240
765
661
321
947
849
415 1,495 1,264
640
30
NA
NA
NA
NA
NA
NA
NA
NA
135
NA
398
195
NA
558
275
808
739
377 1,052
957
490 1,682 1,447
740
50
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
612
325
NA
821
456 1,152 1,076
600 1,879 1,672
910
100
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
54 www.bockwaterheaters.com
494
NA
NA 663 2,006 1,885 1,046
Engineering Manual
INDIRECT WATER HEATER PERFORMANCE
TABLE 31
Hea
t
Los Source
s (ft
. w.c Friction
.)
r)**
Firs
t
Rat Hour
ing
(gal
)*
Sta
n
Rat dby Lo
ing
(°F/ ss
hr)
Min
i
Out mum C
put
o
(BT il
U/H
Coi
l
(gal Volum
e
)
30SK
30
1.4
119
92
27
59,000
1.5
2.3
40SK
38
2.3
198
165
33
105,000
1.5
3.4
50SK
45
2.3
205
165
40
105,000
1.1
3.4
80SK
75
2.8
259
189
70
120,000
0.8
3.5
119SK
110
2.8
291
189
102
120,000
1.2
3.5
Firs
t
Rat Draw
ing
(gal
)*
Model
Actu
Volu al Tank
me
(gal
)
Capacities
Con
Rat tinuous
ing
(GP Draw
H)*
P e r f o r m a n c e
NOTES:
* Based on 77°F rise with 58°F potable water inlet temperature at 14 GPM heat source flow rate. Heat source temperature was 180°F.
** Minimum Coil output based on continuous boiler operation over 30 minutes. See Section III for additional considerations.
All data obtained through testing in accordance with GAMA INDIRECT-FIRED WATER HEATER TESTING STANDARD IWH-TS-1_MARCH 2003
TABLE 32
20
14 0°F
GP
M*
20
12 0°F
GP
M*
20
10 0°F
GP
M*
180
°F
GP
M*
12
20
8 G 0°F
PM
*
180
°F
GP
M*
Model
10
18
8 G 0°F
PM
*
FIRST HOUR RATING (gal) @ Coil Output (Btu/hr)
30SK
115 @ 56,000 117 @ 57,000 118 @ 58,000 138 @ 71,000 144 @ 75,000 149 @ 78,000 154 @ 81,000
40SK
173 @ 89,000 183 @ 96,000 191 @ 101,000 214 @ 115,000 226 @ 123,000 235 @ 129,000 243 @ 134,000
50SK
180 @ 89,000 190 @ 96,000 198 @ 101,000 221 @ 115,000 233 @ 123,000 242 @ 129,000 250 @ 134,000
80SK
233 @ 104,000 245 @ 111,000 254 @ 117,000 277 @ 132,000 292 @ 141,000 304 @ 149,000 314 @ 155,000
119SK
265 @ 104,000 277 @ 111,000 286 @ 117,000 309 @ 132,000 324 @ 141,000 336 @ 149,000 346 @ 155,000
NOTES:
First Hour Rating = First Draw + Continuous Draw
* Coil Input (temperature, flow rate). Ratings based on 77°F rise with 58°F inlet potable water.
All data obtained through testing in accordance with GAMA INDIRECT-FIRED WATER HEATER TESTING STANDARD IWH-TS-1_MARCH 2003
Engineering Manual
55
TABLE 33
DELIVERY AT 40oF RISE – POWER GAS, ATMOSPHERIC GAS, ENERGY SAVERS
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
20 min.
30 min.
45 min.
1 hr.
2 hr.
32PG
32
104,000
46
67
87
108
150
212
274
522
770
4.14
248
8
32PPG
32
104,000
46
67
88
109
150
212
275
524
773
4.15
249
8
33PG
33
104,000
46
67
87
108
148
210
271
516
761
4.08
245
8
40PG
40
126,000
57
82
108
133
183
259
335
637
940
5.04
303
8
50ESPG
50
140,000
65
91
118
144
198
277
357
677
996
5.32
319
9
51PG
50
152,000
69
99
129
159
218
308
397
755
1,114
5.97
358
8
11
71PG
68
173,000
82
114
145
177
241
336
432
813
1,195
6.36
382
72PG
67
199,000
90
128
167
205
282
396
511
971
1,431
7.66
460
9
73PG
67
242,000
98
144
190
236
329
468
607
1,162
1,718
9.26
556
7
120PG
113
155,000
118
148
178
208
268
358
448
809
1,169
6.01
361
19
190PG
113
190,000
121
157
193
229
301
408
516
946
1,377
7.18
431
16
10
241PG
109
277,000
136
189
242
295
401
560
719
1,355
1,991
10.60
636
361PG
91
385,000
147
223
298
374
525
752
978
1,886
2,793
15.12
907
6
541PG
83
623,000
180
298
416
533
768
1,121
1,474
2,886
4,298
23.53
1,412
4
11
150G-400
175
400,000
225
307
389
470
634
880
1,125
2,107
3,089
16.37
982
150G-600
166
600,000
259
381
504
627
872
1,241
1,609
3,082
4,555
24.55
1,473
7
150G-800
157
800,000
292
456
619
783
1,110
1,601
2,092
4,056
6,020
32.73
1,964
5
13
200G-450
245
450,000
293
385
477
569
753
1,029
1,305
2,410
3,515
18.42
1,105
200G-650
212
650,000
306
439
572
705
971
1,370
1,768
3,363
4,958
26.58
1,595
8
200G-850
204
850,000
341
514
688
862
1,210
1,731
2,253
4,339
6,425
34.77
2,086
6
200G-1150
191
1,150,000
391
627
862
1,097
1,568
2,273
2,979
5,802
8,625
47.05
2,823
4
250G-800
271
800,000
385
549
713
876
1,204
1,695
2,186
4,150
6,114
32.73
1,964
8
250G-1000
257
1,000,000
415
619
824
1,029
1,438
2,051
2,665
5,120
7,575
40.92
2,455
6
250G-1250
247
1,250,000
458
713
969
1,225
1,736
2,503
3,270
6,338
9,406
51.13
3,068
5
250G-1500
247
1,500,000
509
816
1,123
1,429
2,043
2,964
3,884
7,566
11,248
61.37
3,682
4
75-76SKG
73
76,000
75
90
105
121
152
198
244
429
613
3.08
185
24
100-76SKG
98
76,000
95
110
126
141
172
218
264
449
634
3.08
185
32
EZ 75-76
75
76,000
75
90
106
121
151
197
242
425
607
3.04
182
25
75
76,000
76
92
107
122
153
199
246
430
615
3.08
185
24
EZ 100-76
EZ 76-76PDV
100
76,000
95
110
126
141
171
217
262
445
627
3.04
182
33
EZ 100-76PDV
100
76,000
96
112
127
143
173
220
266
451
635
3.08
185
32
67
135,000
81
108
135
162
216
297
378
702
1,026
5.40
324
12
EZ 75-135
EZ 80-156
80
156,000
95
126
158
189
251
345
439
813
1,188
6.24
375
13
EZ 80-199
80
199,000
104
144
183
223
303
422
542
1,020
1,497
7.96
478
10
EZ 90-199
90
199,000
112
152
191
231
311
430
550
1,028
1,505
7.96
478
11
EZ 100-199
100
199,000
120
160
199
239
319
438
558
1,036
1,513
7.96
478
13
10
60HEC-125
60
125,000
88
118
148
178
238
328
418
778
1,138
6.00
360
60HEC-150
60
150,000
91
126
160
195
265
370
474
893
1,312
6.98
419
9
60HEC-199
60
199,000
101
147
193
238
330
467
605
1,154
1,704
9.16
549
7
100HEC-150
100
150,000
136
173
211
248
322
434
545
991
1,437
7.44
446
13
100HEC-199
100
199,000
148
197
246
295
393
540
687
1,275
1,863
9.80
588
10
100HEC-250
100
250,000
158
218
279
340
461
643
825
1,553
2,280
12.13
728
8
100HEC-300
100
300,000
161
230
299
368
506
713
920
1,749
2,577
13.81
828
7
100HEC-399
100
399,000
186
279
371
464
650
928
1,207
2,320
3,434
18.56
1,114
5
80W-250SD
80
250,000
115
165
216
266
367
519
670
1,276
1,882
10.10
606
8
10
100W-250SD
98
250,000
129
179
230
280
381
533
684
1,291
1,897
10.10
606
100W-270SD
100
270,000
135
189
244
298
407
571
735
1,389
2,044
10.91
655
9
75W-300SD
75
300,000
121
181
242
302
424
605
787
1,515
2,242
12.12
727
6
100W-300SD
100
300,000
141
201
262
322
444
625
807
1,535
2,262
12.12
727
8
66W-370SD
65
370,000
127
201
276
351
500
725
949
1,846
2,743
14.95
897
4
66W-399SD
65
399,999
133
214
294
375
537
779
1,022
1,991
2,961
16.16
970
4
80W-425SD
80
425,000
150
236
322
407
579
837
1,094
2,125
3,155
17.17
1,030
5
80W-450SD
80
450,000
155
246
337
428
609
882
1,155
2,246
3,337
18.18
1,091
4
80W-505SD
80
505,000
166
268
370
472
676
982
1,288
2,512
3,737
20.40
1,224
4
66W-625SD
65
625,000
178
305
431
557
810
1,188
1,567
3,082
4,597
25.25
1,515
3
80W-725SD
80
725,000
210
357
503
650
943
1,382
1,822
3,579
5,337
29.29
1,758
3
56 www.bockwaterheaters.com
Engineering Manual
TABLE 34
DELIVERY AT 40oF RISE – OIL
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
30 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
45 min.
1 hr.
2 hr.
3 hr.
20E
20
60,000
29
42
54
66
91
129
166
316
465
2.49
149
8
32E
32
104,000
48
69
90
112
154
218
282
538
794
4.27
256
8
32PP
32
104,000
48
70
92
114
158
224
290
555
820
4.41
265
7
33E
33
104,000
47
68
89
110
151
214
276
526
775
4.16
250
8
40E
40
126,000
58
83
109
135
186
262
339
645
951
5.11
306
8
50ES
50
140,000
69
97
126
154
211
296
381
721
1,062
5.67
340
9
51E
50
152,000
70
100
130
161
221
312
402
765
1,128
6.04
363
8
51PP
50
152,000
73
105
138
171
236
334
432
824
1,216
6.53
392
8
71E
68
173,000
85
118
151
184
251
350
449
846
1,244
6.62
397
10
72E
67
199,000
93
133
173
213
292
412
531
1,009
1,487
7.96
478
8
73E
67
242,000
102
150
199
247
344
489
635
1,216
1,797
9.68
581
7
120E
113
155,000
120
151
181
212
273
365
457
824
1,192
6.12
367
18
190E
113
190,000
126
163
201
238
313
424
536
984
1,432
7.46
448
15
241E
109
277,000
138
192
246
299
407
568
729
1,373
2,017
10.74
644
10
361E
91
415,000
156
239
322
405
571
820
1,069
2,066
3,062
16.61
996
5
541E
83
623,000
186
308
429
551
794
1,159
1,523
2,982
4,440
24.31
1,458
3
150E-400
175
400,000
230
314
398
482
650
901
1,153
2,159
3,165
16.77
1,006
10
150E-600
166
600,000
265
391
516
642
894
1,271
1,648
3,157
4,666
25.15
1,509
7
150E-800
157
800,000
299
467
635
802
1,138
1,641
2,144
4,156
6,168
33.53
2,012
5
200E-450
245
450,000
300
394
488
583
771
1,054
1,337
2,469
3,601
18.87
1,132
13
200E-650
212
650,000
314
450
586
723
995
1,404
1,813
3,448
5,083
27.25
1,635
8
200E-850
204
850,000
349
527
705
884
1,240
1,774
2,309
4,447
6,585
35.63
2,138
6
200E-1150
191
1,150,000
401
642
883
1,124
1,606
2,329
3,052
5,944
8,836
48.20
2,892
4
250E-800
271
800,000
396
564
733
901
1,237
1,742
2,247
4,266
6,285
33.65
2,019
8
250E-1000
257
1,000,000
430
641
853
1,065
1,489
2,124
2,760
5,302
7,844
42.37
2,542
6
250E-1250
247
1,250,000
467
728
990
1,251
1,773
2,556
3,339
6,472
9,605
52.22
3,133
5
250E-1500
247
1,500,000
528
846
1,164
1,482
2,118
3,073
4,027
7,845
11,663
63.63
3,818
4
Engineering Manual
57
TABLE 35
DELIVERY AT 50oF RISE – POWER GAS, ATMOSPHERIC GAS, ENERGY SAVERS
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
30 min.
45 min.
1 hr.
2 hr.
32PG
32
104,000
42
59
75
92
125
174
224
422
621
3.31
199
10
32PPG
32
104,000
42
59
75
92
125
175
225
424
623
3.32
199
10
33PG
33
104,000
42
59
75
91
124
173
222
418
614
3.27
196
10
40PG
40
126,000
52
72
93
113
153
214
274
516
758
4.03
242
10
50ESPG
50
140,000
59
81
102
123
166
230
293
549
804
4.26
255
12
51PG
50
152,000
63
87
111
135
182
254
326
612
899
4.77
286
10
71PG
68
173,000
75
101
126
152
203
279
355
661
966
5.09
305
13
72PG
67
199,000
82
113
144
174
236
328
419
787
1,155
6.13
368
11
73PG
67
242,000
88
125
162
199
273
385
496
940
1,385
7.41
444
9
120PG
113
155,000
112
136
160
184
232
304
376
664
953
4.81
288
24
190PG
113
190,000
114
143
171
200
258
344
430
774
1,119
5.74
344
20
241PG
109
277,000
126
168
211
253
338
465
592
1,101
1,610
8.48
509
13
361PG
91
385,000
132
192
253
313
434
616
797
1,523
2,248
12.09
726
8
541PG
83
623,000
157
251
345
439
627
910
1,192
2,321
3,451
18.82
1,129
4
150G-400
175
400,000
208
274
339
405
536
732
928
1,713
2,498
13.08
785
13
150G-600
166
600,000
234
332
430
528
725
1,019
1,314
2,492
3,670
19.63
1,178
8
150G-800
157
800,000
259
390
521
652
914
1,307
1,699
3,270
4,841
26.18
1,571
6
200G-450
245
450,000
274
348
421
495
642
863
1,084
1,968
2,852
14.73
884
17
200G-650
212
650,000
280
386
492
599
811
1,130
1,449
2,725
4,001
21.27
1,276
10
200G-850
204
850,000
306
445
584
723
1,001
1,419
1,836
3,505
5,174
27.82
1,669
7
200G-1150
191
1,150,000
344
533
721
909
1,285
1,850
2,414
4,672
6,930
37.63
2,258
5
250G-800
271
800,000
353
483
614
745
1,007
1,400
1,793
3,364
4,935
26.18
1,571
10
250G-1000
257
1,000,000
374
538
701
865
1,192
1,683
2,174
4,138
6,102
32.73
1,964
8
250G-1250
247
1,250,000
407
611
816
1,020
1,430
2,043
2,657
5,112
7,567
40.92
2,455
6
250G-1500
247
1,500,000
447
693
938
1,184
1,674
2,411
3,147
6,092
9,037
49.08
2,945
5
75-76SKG
73
76,000
71
84
96
108
133
170
207
355
503
2.46
148
30
100-76SKG
98
76,000
92
104
116
129
153
190
227
375
523
2.46
148
40
EZ 75-76
75
76,000
72
84
96
109
133
169
206
352
498
2.43
146
31
75
76,000
73
85
98
110
135
172
209
356
504
2.46
148
30
EZ 100-76
EZ 76-76PDV
100
76,000
92
104
116
129
153
189
226
372
518
2.43
146
41
EZ 100-76PDV
100
76,000
93
106
118
130
155
192
229
377
524
2.46
148
41
67
135,000
75
97
118
140
183
248
313
572
832
4.32
259
16
EZ 75-135
EZ 80-156
80
156,000
89
114
139
164
214
289
364
663
963
4.99
300
16
EZ 80-199
80
199,000
96
128
160
191
255
351
446
828
1,211
6.37
382
13
EZ 90-199
90
199,000
104
136
168
199
263
359
454
836
1,219
6.37
382
14
EZ 100-199
100
199,000
112
144
176
207
271
367
462
844
1,227
6.37
382
16
60HEC-125
60
125,000
82
106
130
154
202
274
346
634
922
4.80
288
12
60HEC-150
60
150,000
84
112
140
167
223
307
391
726
1,061
5.58
335
11
60HEC-199
60
199,000
92
128
165
202
275
385
495
934
1,374
7.33
440
8
100HEC-150
100
150,000
129
159
188
218
278
367
456
813
1,170
5.95
357
17
100HEC-199
100
199,000
138
177
216
255
334
451
569
1,040
1,510
7.84
471
13
100HEC-250
100
250,000
146
194
243
291
388
534
679
1,261
1,844
9.70
582
10
100HEC-300
100
300,000
147
202
258
313
423
589
755
1,417
2,080
11.04
663
9
100HEC-399
100
399,000
167
241
316
390
538
761
984
1,875
2,766
14.85
891
7
80W-250SD
80
250,000
104
145
185
226
306
428
549
1,034
1,519
8.08
485
10
100W-250SD
98
250,000
119
159
200
240
321
442
563
1,048
1,533
8.08
485
12
100W-270SD
100
270,000
124
167
211
255
342
473
604
1,127
1,651
8.73
524
11
75W-300SD
75
300,000
108
157
205
254
351
496
642
1,224
1,805
9.70
582
8
100W-300SD
100
300,000
128
177
225
274
371
516
662
1,244
1,825
9.70
582
10
66W-370SD
65
370,000
112
172
231
291
411
590
770
1,487
2,205
11.96
718
5
66W-399SD
65
399,999
117
181
246
311
440
634
828
1,604
2,379
12.93
776
5
80W-425SD
80
425,000
133
201
270
339
476
682
888
1,712
2,537
13.74
824
6
80W-450SD
80
450,000
137
209
282
355
500
719
937
1,809
2,682
14.55
873
6
80W-505SD
80
505,000
146
227
309
390
554
799
1,043
2,023
3,002
16.32
979
5
66W-625SD
65
625,000
153
254
355
456
658
961
1,264
2,476
3,688
20.20
1,212
3
80W-725SD
80
725,000
181
298
416
533
767
1,119
1,470
2,876
4,282
23.43
1,406
3
58 www.bockwaterheaters.com
Engineering Manual
DELIVERY AT 50oF RISE – OIL
TABLE 36
DELIVERY (GAL)
Model
Volume
1 hr.
2 hr.
3 hr.
20E
20
60,000
27
37
46
56
76
106
136
256
375
1.99
120
10
32E
32
104,000
43
60
77
94
129
180
231
436
641
3.41
205
9
32PP
32
104,000
43
61
79
96
131
184
237
449
661
3.53
212
9
33E
33
104,000
43
60
76
93
126
176
226
426
626
3.33
200
10
40E
40
126,000
53
73
94
114
155
216
277
522
768
4.08
245
10
50ES
50
140,000
63
86
109
131
177
245
313
585
857
4.54
272
11
51E
50
152,000
64
88
112
136
185
257
330
620
910
4.84
290
10
51PP
50
152,000
66
92
118
145
197
275
354
667
981
5.23
314
10
71E
68
173,000
78
105
131
158
211
290
370
688
1,005
5.30
318
13
72E
67
199,000
85
117
149
181
245
340
436
818
1,200
6.37
382
11
73E
67
242,000
92
131
170
209
286
402
518
983
1,448
7.75
465
9
120E
113
155,000
114
138
163
187
236
310
383
677
971
4.90
294
23
190E
113
190,000
119
148
178
208
268
357
447
805
1,163
5.97
358
19
241E
109
277,000
127
170
213
256
342
471
600
1,115
1,631
8.59
515
13
361E
91
415,000
139
206
272
339
471
671
870
1,667
2,464
13.29
797
7
541E
83
623,000
162
259
356
454
648
940
1,231
2,398
3,565
19.45
1,167
4
150E-400
175
400,000
214
281
348
415
549
750
952
1,757
2,562
13.42
805
13
150E-600
166
600,000
240
340
441
541
743
1,044
1,346
2,553
3,760
20.12
1,207
8
150E-800
157
800,000
266
400
534
668
937
1,339
1,742
3,352
4,962
26.83
1,610
6
200E-450
245
450,000
281
356
431
507
658
884
1,110
2,015
2,920
15.08
905
16
200E-650
212
650,000
287
396
505
614
832
1,159
1,486
2,794
4,102
21.80
1,308
10
200E-850
204
850,000
313
456
598
741
1,026
1,453
1,881
3,591
5,301
28.50
1,710
7
200E-1150
191
1,150,000
353
546
739
931
1,317
1,896
2,474
4,788
7,102
38.57
2,314
5
250E-800
271
800,000
363
497
632
767
1,036
1,440
1,844
3,460
5,076
26.93
1,616
10
250E-1000
257
1,000,000
387
557
726
896
1,235
1,743
2,252
4,286
6,320
33.90
2,034
8
250E-1250
247
1,250,000
415
624
833
1,042
1,459
2,086
2,712
5,218
7,724
41.77
2,506
6
250E-1500
247
1,500,000
464
719
973
1,228
1,737
2,501
3,265
6,320
9,375
50.92
3,055
5
Engineering Manual
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
59
DELIVERY AT 60oF RISE – POWER GAS, ATMOSPHERIC GAS, ENERGY SAVERS
TABLE 37
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
30 min.
45 min.
1 hr.
2 hr.
32PG
32
104,000
39
53
67
81
108
150
191
356
522
2.76
165
12
32PPG
32
104,000
39
53
67
81
109
150
192
358
524
2.77
166
12
33PG
33
104,000
40
53
67
80
108
148
189
353
516
2.72
163
12
40PG
40
126,000
49
66
82
99
133
183
234
435
637
3.36
202
12
14
50ESPG
50
140,000
56
73
91
109
144
198
251
464
677
3.55
213
51PG
50
152,000
59
79
99
119
159
218
278
517
755
3.98
239
13
71PG
68
173,000
71
92
114
135
177
241
304
559
813
4.24
254
16
13
72PG
67
199,000
77
103
128
154
205
282
358
665
971
5.11
307
73PG
67
242,000
82
113
144
175
236
329
422
792
1,162
6.17
370
11
120PG
113
155,000
108
128
148
168
208
268
328
568
809
4.01
240
28
190PG
113
190,000
109
133
157
181
229
301
372
659
946
4.78
287
24
241PG
109
277,000
119
154
189
225
295
401
507
931
1,355
7.07
424
15
361PG
91
385,000
122
172
223
273
374
525
676
1,281
1,886
10.08
605
9
541PG
83
623,000
141
220
298
376
533
768
1,004
1,945
2,886
15.69
941
5
175
400,000
198
252
307
362
471
634
798
1,453
2,108
10.92
655
16
10
150G-400
150G-600
166
600,000
218
299
381
463
627
872
1,118
2,100
3,082
16.37
982
150G-800
157
800,000
237
347
456
565
783
1,110
1,437
2,746
4,055
21.82
1,309
7
200G-450
245
450,000
262
323
384
446
568
752
936
1,672
2,408
12.27
736
20
12
200G-650
212
650,000
262
351
439
528
705
971
1,237
2,301
3,365
17.73
1,064
200G-850
204
850,000
283
399
515
631
862
1,210
1,558
2,949
4,340
23.18
1,391
9
200G-1150
191
1,150,000
313
470
627
784
1,097
1,568
2,038
3,920
5,802
31.37
1,882
6
12
250G-800
271
800,000
331
440
549
658
876
1,203
1,531
2,840
4,149
21.82
1,309
250G-1000
257
1,000,000
346
483
619
755
1,028
1,437
1,846
3,482
5,118
27.27
1,636
9
250G-1250
247
1,250,000
372
543
713
884
1,224
1,736
2,247
4,292
6,337
34.08
2,045
7
250G-1500
247
1,500,000
407
611
816
1,020
1,430
2,043
2,657
5,112
7,567
40.92
2,455
6
75-76SKG
73
76,000
69
80
90
100
121
152
182
305
429
2.05
123
36
100-76SKG
98
76,000
90
100
110
120
141
172
203
326
449
2.05
123
48
EZ 75-76
75
76,000
70
80
90
101
121
151
182
303
425
2.03
122
37
75
76,000
71
81
92
102
122
153
184
307
430
2.05
123
37
EZ 100-76
EZ 75-76PDV
100
76,000
90
100
110
121
141
171
202
323
445
2.03
122
49
EZ 100-76PDV
100
76,000
91
102
112
122
143
173
204
327
451
2.05
123
49
67
135,000
72
90
108
126
162
216
270
486
702
3.60
216
19
19
EZ 75-135
EZ 80-156
80
156,000
85
106
126
147
189
251
314
563
813
4.16
250
EZ 80-199
80
199,000
91
117
144
170
223
303
383
701
1,020
5.31
319
15
EZ 90-199
90
199,000
99
125
152
178
231
311
391
709
1,028
5.31
319
17
EZ 100-199
100
199,000
107
133
160
186
239
319
399
717
1,036
5.31
319
19
60HEC-125
60
125,000
78
98
118
138
178
238
298
538
778
4.00
240
15
13
60HEC-150
60
150,000
79
102
126
149
195
265
335
614
893
4.65
279
60HEC-199
60
199,000
86
116
147
177
238
330
422
788
1,154
6.11
366
10
100HEC-150
100
150,000
124
149
173
198
248
322
397
694
991
4.96
297
20
100HEC-199
100
199,000
131
164
197
229
295
393
491
883
1,275
6.54
392
15
100HEC-250
100
250,000
137
178
218
259
340
461
582
1,067
1,553
8.09
485
12
11
100HEC-300
100
300,000
138
184
230
276
368
506
644
1,196
1,749
9.20
552
100HEC-399
100
399,000
155
217
279
340
464
650
835
1,578
2,320
12.37
742
8
80W-250SD
80
250,000
98
131
165
199
266
367
468
872
1,276
6.73
404
12
100W-250SD
98
250,000
112
146
179
213
280
381
482
886
1,291
6.73
404
15
100W-270SD
100
270,000
116
153
189
225
298
407
516
953
1,389
7.27
436
14
75W-300SD
75
300,000
100
141
181
222
302
424
545
1,030
1,515
8.08
485
9
100W-300SD
100
300,000
120
161
201
242
322
444
565
1,050
1,535
8.08
485
12
66W-370SD
65
370,000
102
152
201
251
351
500
650
1,248
1,846
9.97
598
7
66W-399SD
65
399,999
106
160
214
267
375
537
698
1,345
1,991
10.77
646
6
80W-425SD
80
425,000
121
178
236
293
407
579
751
1,438
2,125
11.45
687
7
80W-450SD
80
450,000
125
185
246
306
428
609
791
1,519
2,246
12.12
727
7
6
80W-505SD
80
505,000
132
200
268
336
472
676
880
1,696
2,512
13.60
816
66W-625SD
65
625,000
136
220
305
389
557
810
1,062
2,072
3,082
16.84
1,010
4
80W-725SD
80
725,000
162
259
357
455
650
943
1,236
2,407
3,579
19.53
1,172
4
60 www.bockwaterheaters.com
Engineering Manual
DELIVERY AT 60oF RISE – OIL
TABLE 38
DELIVERY (GAL)
Model
Volume
1 hr.
2 hr.
3 hr.
20E
20
60,000
25
33
42
50
66
91
116
216
316
1.66
100
12
32E
32
104,000
40
55
69
83
112
154
197
367
538
2.84
171
11
32PP
32
104,000
40
55
70
84
114
158
202
379
555
2.94
176
11
33E
33
104,000
40
54
68
82
110
151
193
359
526
2.77
166
12
40E
40
126,000
49
66
83
100
135
186
237
441
645
3.40
204
12
50ES
50
140,000
59
78
97
116
154
211
267
494
721
3.78
227
13
51E
50
152,000
60
80
100
120
161
221
282
523
765
4.03
242
12
51PP
50
152,000
62
84
105
127
171
236
301
563
824
4.36
261
11
71E
68
173,000
74
96
118
140
184
251
317
582
846
4.41
265
15
72E
67
199,000
80
107
133
160
213
292
372
691
1,009
5.31
319
13
73E
67
242,000
86
118
150
183
247
344
441
828
1,216
6.46
387
10
120E
113
155,000
110
130
151
171
212
273
334
579
824
4.08
245
28
190E
113
190,000
114
138
163
188
238
313
387
686
984
4.97
298
23
241E
109
277,000
120
156
192
228
299
407
514
944
1,373
7.16
430
15
361E
91
415,000
128
184
239
294
405
571
737
1,401
2,066
11.07
664
8
541E
83
623,000
146
227
308
389
551
794
1,037
2,009
2,982
16.20
972
5
150E-400
175
400,000
203
259
314
370
482
650
818
1,489
2,160
11.18
671
16
150E-600
166
600,000
223
307
391
474
642
894
1,145
2,151
3,157
16.77
1,006
10
150E-800
157
800,000
243
355
467
579
802
1,137
1,473
2,814
4,155
22.35
1,341
7
200E-450
245
450,000
268
331
394
457
583
772
960
1,715
2,470
12.58
755
19
200E-650
212
650,000
269
359
450
541
723
995
1,268
2,358
3,448
18.17
1,090
12
200E-850
204
850,000
290
408
527
646
883
1,240
1,596
3,021
4,446
23.75
1,425
9
200E-1150
191
1,150,000
321
481
642
803
1,124
1,606
2,088
4,016
5,944
32.13
1,928
6
250E-800
271
800,000
340
452
564
677
901
1,237
1,574
2,920
4,266
22.43
1,346
12
250E-1000
257
1,000,000
359
500
641
783
1,065
1,489
1,913
3,608
5,303
28.25
1,695
9
250E-1250
247
1,250,000
380
554
728
902
1,250
1,772
2,294
4,382
6,470
34.80
2,088
7
250E-1500
247
1,500,000
422
634
846
1,058
1,482
2,118
2,754
5,299
7,844
42.42
2,545
6
Engineering Manual
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
61
DELIVERY AT 70oF RISE – POWER GAS, ATMOSPHERIC GAS, ENERGY SAVERS
TABLE 39
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
30 min.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
45 min.
1 hr.
2 hr.
32PG
32
104,000
37
49
61
73
96
132
167
309
451
2.36
142
14
32PPG
32
104,000
37
49
61
73
97
132
168
310
452
2.37
142
13
14
33PG
33
104,000
38
49
61
73
96
131
166
306
446
2.33
140
40PG
40
126,000
46
61
75
90
118
162
205
378
551
2.88
173
14
50ESPG
50
140,000
53
68
84
99
129
175
220
403
585
3.04
182
16
51PG
50
152,000
56
73
90
107
142
193
244
449
653
3.41
205
15
71PG
68
173,000
68
86
104
123
159
214
268
486
704
3.63
218
19
72PG
67
199,000
73
95
117
139
183
249
314
577
840
4.38
263
15
73PG
67
242,000
78
104
131
157
210
289
369
686
1,004
5.29
317
13
120PG
113
155,000
105
122
139
156
191
242
294
500
706
3.43
206
33
190PG
113
190,000
106
126
147
167
208
270
331
577
823
4.10
246
28
241PG
109
277,000
114
144
174
205
265
356
447
810
1,174
6.06
363
18
361PG
91
385,000
115
158
201
244
331
460
590
1,108
1,626
8.64
518
11
541PG
83
623,000
130
197
264
332
466
668
869
1,676
2,483
13.44
807
6
175
400,000
190
237
283
330
424
564
704
1,265
1,826
9.35
561
19
12
150G-400
150G-600
166
600,000
206
276
346
417
557
767
978
1,820
2,662
14.03
842
150G-800
157
800,000
222
315
409
502
689
970
1,250
2,372
3,494
18.70
1,122
8
200G-450
245
450,000
253
305
358
411
516
674
831
1,462
2,093
10.52
631
23
200G-650
212
650,000
249
325
401
477
629
857
1,085
1,997
2,909
15.20
912
14
200G-850
204
850,000
266
365
465
564
763
1,061
1,359
2,551
3,743
19.87
1,192
10
200G-1150
191
1,150,000
291
425
559
694
963
1,366
1,769
3,382
4,995
26.88
1,613
7
250G-800
271
800,000
315
409
502
596
783
1,063
1,344
2,466
3,588
18.70
1,122
14
11
250G-1000
257
1,000,000
327
444
561
678
912
1,262
1,613
3,016
4,419
23.38
1,403
250G-1250
247
1,250,000
348
494
640
786
1,078
1,517
1,955
3,708
5,461
29.22
1,753
8
250G-1500
247
1,500,000
377
553
728
903
1,254
1,780
2,306
4,410
6,514
35.07
2,104
7
75-76SKG
73
76,000
68
77
86
94
112
138
165
270
376
1.76
106
41
100-76SKG
98
76,000
88
97
106
115
132
159
185
291
396
1.76
106
56
EZ 75-76
75
76,000
69
77
86
95
112
138
164
269
373
1.74
104
43
75
76,000
70
78
87
96
114
140
166
272
377
1.76
106
43
EZ 100-76
EZ 75-76PDV
100
76,000
89
97
106
115
132
158
184
289
393
1.74
104
58
EZ 100-76PDV
100
76,000
90
99
107
116
134
160
187
292
398
1.76
106
57
67
135,000
69
84
100
115
146
193
239
424
609
3.09
185
22
EZ 75-135
EZ 80-156
80
156,000
82
100
118
135
171
225
278
492
706
3.57
214
22
EZ 80-199
80
199,000
87
110
132
155
201
269
337
610
883
4.55
273
18
EZ 90-199
90
199,000
95
118
140
163
209
277
345
618
891
4.55
273
20
EZ 100-199
100
199,000
103
126
148
171
217
285
353
626
899
4.55
273
22
60HEC-125
60
125,000
75
92
109
126
160
212
263
469
675
3.43
206
17
60HEC-150
60
150,000
76
96
116
136
175
235
295
534
774
3.99
239
15
60HEC-199
60
199,000
81
108
134
160
212
291
369
683
997
5.23
314
11
100HEC-150
100
150,000
120
142
163
184
227
290
354
609
864
4.25
255
24
100HEC-199
100
199,000
127
155
183
211
267
351
435
771
1,107
5.60
336
18
100HEC-250
100
250,000
132
166
201
236
305
409
513
929
1,345
6.93
416
14
100HEC-300
100
300,000
131
171
210
250
329
447
565
1,039
1,512
7.89
473
13
100HEC-399
100
399,000
146
199
252
305
411
570
729
1,366
2,002
10.61
636
9
80W-250SD
80
250,000
93
122
151
179
237
324
410
757
1,103
5.77
346
14
100W-250SD
98
250,000
107
136
165
194
252
338
425
771
1,117
5.77
346
17
100W-270SD
100
270,000
111
142
174
205
267
361
454
828
1,202
6.23
374
16
75W-300SD
75
300,000
95
129
164
199
268
372
476
891
1,307
6.93
416
11
100W-300SD
100
300,000
115
149
184
219
288
392
496
911
1,327
6.93
416
14
66W-370SD
65
370,000
95
137
180
223
308
436
565
1,077
1,590
8.54
513
8
66W-399SD
65
399,999
98
144
191
237
329
468
606
1,160
1,714
9.24
554
7
80W-425SD
80
425,000
113
162
211
260
358
506
653
1,241
1,830
9.81
589
8
80W-450SD
80
450,000
116
168
220
272
376
532
687
1,311
1,934
10.39
623
8
80W-505SD
80
505,000
122
181
239
297
414
589
764
1,463
2,163
11.66
700
7
66W-625SD
65
625,000
124
196
268
341
485
701
918
1,784
2,649
14.43
866
5
80W-725SD
80
725,000
148
231
315
399
566
817
1,068
2,073
3,077
16.74
1,044
5
62 www.bockwaterheaters.com
Engineering Manual
DELIVERY AT 70oF RISE – OIL
TABLE 40
DELIVERY (GAL)
Model
Volume
1 hr.
2 hr.
3 hr.
20E
20
60,000
24
31
38
45
59
81
102
187
273
1.42
85
14
32E
32
104,000
38
51
63
75
99
136
172
319
465
2.44
146
13
32PP
32
104,000
38
51
63
76
101
139
177
328
479
2.52
151
13
33E
33
104,000
38
50
62
74
98
133
169
312
454
2.38
143
14
40E
40
126,000
47
62
76
91
120
164
207
382
557
2.92
175
14
50ES
50
140,000
57
73
89
105
138
186
235
429
624
3.24
194
15
51E
50
152,000
57
74
92
109
143
195
247
454
661
3.45
207
14
51PP
50
152,000
59
77
96
115
152
208
264
488
712
3.73
224
13
71E
68
173,000
71
90
109
128
166
222
279
506
733
3.78
227
18
72E
67
199,000
76
99
122
145
190
258
327
600
873
4.55
273
15
73E
67
242,000
81
109
137
164
220
303
386
718
1,050
5.53
332
12
120E
113
155,000
107
124
142
159
194
247
299
509
719
3.50
210
32
190E
113
190,000
110
131
153
174
217
281
344
600
856
4.26
256
27
241E
109
277,000
115
146
177
207
269
361
453
821
1,189
6.14
368
18
361E
91
415,000
120
168
215
263
357
500
642
1,212
1,781
9.49
569
10
541E
83
623,000
134
204
273
343
481
690
898
1,731
2,565
13.89
833
6
150E-400
175
400,000
195
243
290
338
434
578
722
1,297
1,872
9.58
575
18
150E-600
166
600,000
211
283
355
426
570
786
1,001
1,863
2,725
14.37
862
12
150E-800
157
800,000
227
323
419
515
707
994
1,282
2,432
3,582
19.17
1,150
8
200E-450
245
450,000
259
313
367
421
529
691
852
1,499
2,146
10.78
647
23
200E-650
212
650,000
255
333
411
489
645
878
1,112
2,046
2,980
15.57
934
14
200E-850
204
850,000
273
375
477
578
782
1,088
1,393
2,615
3,837
20.37
1,222
10
200E-1150
191
1,150,000
298
436
573
711
987
1,400
1,813
3,466
5,119
27.55
1,653
7
250E-800
271
800,000
324
420
516
613
805
1,093
1,382
2,536
3,690
19.23
1,154
14
250E-1000
257
1,000,000
339
460
581
702
944
1,307
1,671
3,124
4,577
24.22
1,453
11
250E-1250
247
1,250,000
355
505
654
803
1,101
1,549
1,996
3,786
5,576
29.83
1,790
8
250E-1500
247
1,500,000
391
573
755
937
1,301
1,846
2,392
4,574
6,756
36.37
2,182
7
Engineering Manual
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
63
DELIVERY AT 80oF RISE – POWER GAS, ATMOSPHERIC GAS, ENERGY SAVERS
TABLE 41
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
1 hr.
2 hr.
32PG
32
104,000
36
46
56
67
87
118
150
274
398
2.07
124
15
32PPG
32
104,000
36
46
57
67
88
119
150
275
399
2.07
124
15
33PG
33
104,000
36
46
57
67
87
118
148
271
393
2.04
123
16
40PG
40
126,000
45
57
70
82
108
145
183
335
486
2.52
151
16
50ESPG
50
140,000
51
65
78
91
118
158
198
357
517
2.66
160
19
51PG
50
152,000
54
69
84
99
129
174
218
397
576
2.98
179
17
71PG
68
173,000
66
82
98
114
145
193
241
432
622
3.18
191
21
72PG
67
199,000
71
90
109
128
167
224
282
511
741
3.83
230
17
73PG
67
242,000
74
98
121
144
190
260
329
607
885
4.63
278
14
120PG
113
155,000
103
118
133
148
178
223
268
448
628
3.00
180
38
190PG
113
190,000
103
121
139
157
193
247
301
516
731
3.59
215
31
241PG
109
277,000
110
136
163
189
242
322
401
719
1,037
5.30
318
21
12
361PG
91
385,000
109
147
185
223
298
412
525
978
1,432
7.56
454
541PG
83
623,000
121
180
239
298
416
592
768
1,474
2,180
11.76
706
7
175
400,000
184
225
266
307
389
511
634
1,125
1,616
8.18
491
21
150G-400
150G-600
166
600,000
197
258
320
381
504
688
872
1,608
2,344
12.27
736
14
150G-800
157
800,000
210
292
374
456
619
865
1,110
2,092
3,074
16.37
982
10
200G-450
245
450,000
246
292
338
384
476
614
752
1,304
1,856
9.20
552
27
200G-650
212
650,000
240
306
373
439
572
772
971
1,769
2,567
13.30
798
16
12
200G-850
204
850,000
254
341
428
514
688
949
1,210
2,253
3,296
17.38
1,043
200G-1150
191
1,150,000
274
391
509
627
862
1,214
1,567
2,978
4,389
23.52
1,411
8
250G-800
271
800,000
304
385
467
549
713
958
1,204
2,186
3,168
16.37
982
17
250G-1000
257
1,000,000
312
415
517
619
824
1,130
1,437
2,664
3,891
20.45
1,227
13
250G-1250
247
1,250,000
330
458
585
713
969
1,352
1,736
3,270
4,804
25.57
1,534
10
250G-1500
247
1,500,000
355
509
662
816
1,123
1,583
2,043
3,884
5,725
30.68
1,841
8
75-76SKG
73
76,000
67
75
82
90
105
128
152
244
336
1.54
92
47
100-76SKG
98
76,000
87
95
102
110
126
149
172
264
357
1.54
92
64
EZ 75-76
75
76,000
68
75
83
90
106
128
151
242
334
1.52
91
49
49
75
76,000
68
76
84
92
107
130
153
246
338
1.54
92
EZ 100-76
EZ 75-76PDV
100
76,000
88
95
103
110
126
148
171
262
354
1.52
91
66
EZ 100-76PDV
100
76,000
89
96
104
112
127
150
173
266
358
1.54
92
65
EZ 75-135
67
135,000
67
81
94
108
135
175
216
378
540
2.70
162
25
EZ 80-156
80
156,000
80
95
111
126
158
204
251
439
626
3.12
187
26
20
EZ 80-199
80
199,000
84
104
124
144
183
243
303
542
781
3.98
239
EZ 90-199
90
199,000
92
112
132
152
191
251
311
550
789
3.98
239
23
EZ 100-199
100
199,000
100
120
140
160
199
259
319
558
797
3.98
239
25
60HEC-125
60
125,000
73
88
103
118
148
193
238
418
598
3.00
180
20
60HEC-150
60
150,000
73
91
108
126
160
213
265
474
684
3.49
209
17
60HEC-199
60
199,000
78
101
124
147
193
261
330
605
879
4.58
275
13
100HEC-150
100
150,000
118
136
155
173
211
266
322
545
768
3.72
223
27
100HEC-199
100
199,000
123
148
172
197
246
319
393
687
981
4.90
294
20
100HEC-250
100
250,000
127
158
188
218
279
370
461
825
1,189
6.06
364
16
14
100HEC-300
100
300,000
127
161
196
230
299
403
506
920
1,334
6.90
414
100HEC-399
100
399,000
139
186
232
279
371
511
650
1,207
1,763
9.28
557
11
80W-250SD
80
250,000
89
115
140
165
216
291
367
670
973
5.05
303
16
100W-250SD
98
250,000
104
129
154
179
230
306
381
684
987
5.05
303
19
100W-270SD
100
270,000
107
135
162
189
244
325
407
735
1,062
5.45
327
18
75W-300SD
75
300,000
90
121
151
181
242
333
424
787
1,151
6.06
364
12
100W-300SD
100
300,000
110
141
171
201
262
353
444
807
1,171
6.06
364
17
66W-370SD
65
370,000
89
127
164
201
276
388
500
949
1,397
7.47
448
9
66W-399SD
65
399,999
92
133
173
214
294
416
537
1,022
1,507
8.08
485
8
80W-425SD
80
425,000
107
150
193
236
322
450
579
1,094
1,609
8.59
515
9
80W-450SD
80
450,000
109
155
200
246
337
473
609
1,155
1,700
9.09
545
9
80W-505SD
80
505,000
115
166
217
268
370
523
676
1,288
1,900
10.20
612
8
66W-625SD
65
625,000
115
178
241
305
431
620
810
1,567
2,325
12.63
758
5
80W-725SD
80
725,000
137
210
284
357
503
723
943
1,822
2,700
14.65
879
5
64 www.bockwaterheaters.com
Engineering Manual
DELIVERY AT 80oF RISE – OIL
TABLE 42
DELIVERY (GAL)
Model
Volume
1 hr.
2 hr.
3 hr.
20E
20
60,000
23
29
35
42
54
73
91
166
241
1.25
75
16
32E
32
104,000
37
48
58
69
90
122
154
282
410
2.13
128
15
32PP
32
104,000
37
48
59
70
92
125
158
290
423
2.21
132
15
33E
33
104,000
37
47
58
68
89
120
151
276
401
2.08
125
16
40E
40
126,000
45
58
71
83
109
147
186
339
492
2.55
153
16
50ES
50
140,000
55
69
83
97
126
168
211
381
551
2.84
170
18
51E
50
152,000
55
70
85
100
130
176
221
402
584
3.02
181
17
51PP
50
152,000
56
72
87
103
135
182
229
418
607
3.15
189
15
71E
68
173,000
69
85
102
118
151
201
251
449
648
3.31
199
21
72E
67
199,000
74
93
113
133
173
233
292
531
770
3.98
239
17
73E
67
242,000
78
102
126
150
199
271
344
635
925
4.84
291
14
120E
113
155,000
105
120
135
151
181
227
273
457
641
3.06
184
37
190E
113
190,000
107
126
145
163
201
257
313
536
760
3.73
224
30
241E
109
277,000
111
138
165
192
246
326
407
729
1,051
5.37
322
20
361E
91
415,000
114
156
197
239
322
446
571
1,069
1,567
8.30
498
11
541E
83
623,000
126
186
247
308
429
612
794
1,523
2,252
12.15
729
7
150E-400
175
400,000
189
230
272
314
398
524
650
1,153
1,656
8.38
503
21
150E-600
166
600,000
202
265
328
391
517
705
894
1,649
2,404
12.58
755
13
150E-800
157
800,000
215
299
383
467
635
886
1,138
2,144
3,150
16.77
1,006
9
200E-450
245
450,000
253
300
347
394
488
630
771
1,337
1,903
9.43
566
26
200E-650
212
650,000
246
314
382
450
586
790
995
1,812
2,629
13.62
817
16
200E-850
204
850,000
260
349
438
527
705
973
1,240
2,309
3,378
17.82
1,069
11
200E-1150
191
1,150,000
281
401
522
642
883
1,245
1,606
3,052
4,498
24.10
1,446
8
250E-800
271
800,000
312
396
481
565
733
986
1,238
2,248
3,258
16.83
1,010
16
250E-1000
257
1,000,000
324
430
535
641
853
1,171
1,489
2,760
4,031
21.18
1,271
12
250E-1250
247
1,250,000
337
467
598
728
989
1,381
1,772
3,338
4,904
26.10
1,566
9
250E-1500
247
1,500,000
369
528
687
846
1,164
1,641
2,118
4,027
5,936
31.82
1,909
8
Engineering Manual
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
65
DELIVERY AT 90oF RISE – POWER GAS, ATMOSPHERIC GAS, ENERGY SAVERS
TABLE 43
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
30 min.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
45 min.
1 hr.
2 hr.
32PG
32
104,000
35
44
53
62
81
108
136
246
356
1.84
110
17
32PPG
32
104,000
35
44
53
62
81
109
136
247
358
1.84
111
17
33PG
33
104,000
35
44
53
62
80
108
135
244
353
1.81
109
18
40PG
40
126,000
43
54
66
77
99
133
166
301
435
2.24
134
18
21
50ESPG
50
140,000
50
62
73
85
109
144
180
322
464
2.37
142
51PG
50
152,000
53
66
79
92
119
159
198
358
517
2.65
159
19
71PG
68
173,000
64
78
92
107
135
177
220
389
559
2.83
170
24
20
72PG
67
199,000
69
86
103
120
154
205
256
460
665
3.41
204
73PG
67
242,000
72
92
113
134
175
236
298
545
792
4.12
247
16
120PG
113
155,000
101
114
128
141
168
208
248
408
568
2.67
160
42
190PG
113
190,000
101
117
133
149
181
229
277
468
659
3.19
191
35
241PG
109
277,000
107
130
154
178
225
295
366
649
931
4.71
283
23
361PG
91
385,000
105
139
172
206
273
374
475
878
1,281
6.72
403
14
541PG
83
623,000
115
167
220
272
376
533
690
1,317
1,945
10.46
627
8
175
400,000
179
216
252
288
361
470
579
1,015
1,451
7.27
436
24
15
150G-400
150G-600
166
600,000
190
245
300
354
463
627
791
1,446
2,101
10.92
655
150G-800
157
800,000
201
274
347
419
565
783
1,001
1,874
2,747
14.55
873
11
200G-450
245
450,000
241
282
323
364
446
569
691
1,182
1,673
8.18
491
30
200G-650
212
650,000
232
292
351
410
528
705
882
1,591
2,300
11.82
709
18
200G-850
204
850,000
244
321
399
476
630
862
1,094
2,021
2,948
15.45
927
13
200G-1150
191
1,150,000
261
365
470
575
784
1,098
1,411
2,666
3,921
20.92
1,255
9
250G-800
271
800,000
294
367
440
513
658
876
1,095
1,968
2,841
14.55
873
19
250G-1000
257
1,000,000
301
392
483
574
756
1,028
1,301
2,392
3,483
18.18
1,091
14
250G-1250
247
1,250,000
316
429
543
657
884
1,225
1,566
2,930
4,294
22.73
1,364
11
250G-1500
247
1,500,000
338
475
611
747
1,020
1,429
1,838
3,474
5,110
27.27
1,636
9
75-76SKG
73
76,000
66
73
80
87
100
121
141
223
305
1.37
82
53
100-76SKG
98
76,000
86
93
100
107
120
141
161
244
326
1.37
82
72
EZ 75-76
75
76,000
67
74
80
87
101
121
141
222
303
1.35
81
55
75
76,000
68
74
81
88
102
122
143
225
307
1.37
82
55
EZ 100-76
EZ 75-76PDV
100
76,000
87
94
100
107
121
141
161
242
323
1.35
81
74
EZ 100-76PDV
100
76,000
88
95
102
108
122
143
163
245
327
1.37
82
73
67
135,000
66
78
90
102
126
162
198
342
486
2.40
144
28
EZ 75-135
EZ 80-156
80
156,000
78
92
106
119
147
189
230
397
563
2.77
166
29
EZ 80-199
80
199,000
82
99
117
135
170
223
276
489
701
3.54
212
23
EZ 90-199
90
199,000
90
107
125
143
178
231
284
497
709
3.54
212
25
EZ 100-199
100
199,000
98
115
133
151
186
239
292
505
717
3.54
212
28
60HEC-125
60
125,000
71
84
98
111
138
178
218
378
538
2.67
160
22
60HEC-150
60
150,000
71
87
102
118
149
195
242
428
614
3.10
186
19
60HEC-199
60
199,000
76
96
116
137
177
238
299
544
788
4.07
244
15
100HEC-150
100
150,000
116
132
149
165
198
248
297
496
694
3.30
198
30
100HEC-199
100
199,000
120
142
164
186
229
295
360
621
883
4.36
261
23
100HEC-250
100
250,000
124
151
178
205
259
340
420
744
1,067
5.39
323
19
100HEC-300
100
300,000
123
153
184
215
276
368
460
828
1,196
6.14
368
16
100HEC-399
100
399,000
134
175
217
258
340
464
588
1,083
1,578
8.25
495
12
80W-250SD
80
250,000
86
109
131
154
199
266
333
603
872
4.49
269
18
100W-250SD
98
250,000
101
123
146
168
213
280
348
617
886
4.49
269
22
100W-270SD
100
270,000
104
128
153
177
225
298
371
662
953
4.85
291
21
75W-300SD
75
300,000
87
114
141
168
222
302
383
706
1,030
5.39
323
14
100W-300SD
100
300,000
107
134
161
188
242
322
403
726
1,050
5.39
323
19
66W-370SD
65
370,000
85
118
152
185
251
351
451
849
1,248
6.64
399
10
66W-399SD
65
399,999
88
124
160
196
267
375
483
914
1,345
7.18
431
9
80W-425SD
80
425,000
102
140
178
217
293
407
522
980
1,438
7.63
458
10
80W-450SD
80
450,000
104
145
185
226
306
428
549
1,034
1,519
8.08
485
10
80W-505SD
80
505,000
109
155
200
245
336
472
608
1,152
1,696
9.07
544
9
66W-625SD
65
625,000
108
164
220
276
389
557
725
1,399
2,072
11.22
673
6
80W-725SD
80
725,000
129
194
259
324
455
650
845
1,626
2,407
13.02
781
6
66 www.bockwaterheaters.com
Engineering Manual
DELIVERY AT 90oF RISE – OIL
TABLE 44
DELIVERY (GAL)
Model
Volume
1 hr.
2 hr.
3 hr.
20E
20
60,000
22
28
33
39
50
66
83
149
216
1.11
66
18
32E
32
104,000
36
45
55
64
83
112
140
254
367
1.90
114
17
32PP
32
104,000
35
45
55
65
84
114
143
261
379
1.96
118
16
33E
33
104,000
36
45
54
63
82
110
137
248
359
1.85
111
18
40E
40
126,000
44
55
66
78
100
135
169
305
441
2.27
136
18
50ES
50
140,000
53
66
78
91
116
154
192
343
494
2.52
151
20
51E
50
152,000
53
67
80
93
120
161
201
362
523
2.69
161
19
51PP
50
152,000
54
68
82
96
124
166
208
376
544
2.80
168
18
71E
68
173,000
67
81
96
111
140
184
229
405
582
2.94
177
23
72E
67
199,000
71
89
107
124
160
213
266
478
691
3.54
212
19
73E
67
242,000
75
97
118
140
183
247
312
570
828
4.30
258
16
120E
113
155,000
103
116
130
144
171
212
253
416
579
2.72
163
42
190E
113
190,000
105
122
138
155
188
238
288
487
686
3.32
199
34
241E
109
277,000
108
132
156
180
228
299
371
657
944
4.77
286
23
361E
91
415,000
110
147
184
220
294
405
516
958
1,401
7.38
443
12
541E
83
623,000
119
173
227
281
389
551
713
1,361
2,009
10.80
648
8
150E-400
175
400,000
184
221
258
296
370
482
594
1,041
1,488
7.45
447
23
150E-600
166
600,000
195
251
307
363
475
642
810
1,481
2,152
11.18
671
15
150E-800
157
800,000
206
281
355
430
579
802
1,026
1,920
2,814
14.90
894
11
200E-450
245
450,000
247
289
331
373
457
583
708
1,211
1,714
8.38
503
29
200E-650
212
650,000
238
299
360
420
541
723
905
1,632
2,359
12.12
727
17
200E-850
204
850,000
250
329
408
488
646
883
1,121
2,071
3,021
15.83
950
13
200E-1150
191
1,150,000
267
374
482
589
803
1,125
1,446
2,732
4,018
21.43
1,286
9
250E-800
271
800,000
303
378
453
527
677
902
1,126
2,024
2,922
14.97
898
18
250E-1000
257
1,000,000
312
406
500
594
783
1,065
1,348
2,478
3,608
18.83
1,130
14
250E-1250
247
1,250,000
322
438
554
670
902
1,250
1,598
2,990
4,382
23.20
1,392
11
250E-1500
247
1,500,000
351
492
634
775
1,058
1,482
1,906
3,603
5,300
28.28
1,697
9
Engineering Manual
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
67
DELIVERY AT 100oF RISE – POWER GAS, ATMOSPHERIC GAS, ENERGY SAVERS
TABLE 45
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
30 min.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
45 min.
1 hr.
2 hr.
32PG
32
104,000
34
42
50
59
75
100
125
224
323
1.65
99
19
32PPG
32
104,000
34
42
50
59
75
100
125
225
324
1.66
100
19
33PG
33
104,000
34
42
50
59
75
99
124
222
320
1.63
98
20
40PG
40
126,000
42
52
62
72
93
123
153
274
395
2.02
121
20
50ESPG
50
140,000
49
59
70
81
102
134
166
293
421
2.13
128
23
51PG
50
152,000
51
63
75
87
111
147
182
326
469
2.39
143
21
71PG
68
173,000
63
75
88
101
126
164
203
355
508
2.54
153
27
72PG
67
199,000
67
82
98
113
144
190
236
419
603
3.07
184
22
73PG
67
242,000
70
88
107
125
162
218
273
496
718
3.70
222
18
120PG
113
155,000
100
112
124
136
160
196
232
376
520
2.40
144
47
190PG
113
190,000
100
114
128
143
171
214
258
430
602
2.87
172
39
241PG
109
277,000
105
126
147
168
211
274
338
592
847
4.24
254
26
361PG
91
385,000
102
132
162
192
253
344
434
797
1,160
6.05
363
15
541PG
83
623,000
110
157
204
251
345
486
627
1,192
1,757
9.41
565
9
175
400,000
176
209
241
274
340
438
536
929
1,322
6.55
393
27
150G-400
150G-600
166
600,000
185
234
283
332
430
577
725
1,314
1,903
9.82
589
17
150G-800
157
800,000
194
259
325
390
521
717
913
1,698
2,483
13.08
785
12
200G-450
245
450,000
237
274
311
348
421
532
642
1,084
1,526
7.37
442
33
200G-650
212
650,000
227
280
333
386
492
652
811
1,449
2,087
10.63
638
20
200G-850
204
850,000
237
306
376
445
584
793
1,002
1,837
2,672
13.92
835
15
200G-1150
191
1,150,000
250
344
438
533
721
1,003
1,285
2,414
3,543
18.82
1,129
10
250G-800
271
800,000
287
352
418
483
614
810
1,007
1,792
2,577
13.08
785
21
250G-1000
257
1,000,000
292
374
456
538
701
947
1,192
2,174
3,156
16.37
982
16
250G-1250
247
1,250,000
304
406
509
611
815
1,122
1,429
2,656
3,883
20.45
1,227
12
250G-1500
247
1,500,000
325
448
570
693
939
1,307
1,675
3,148
4,621
24.55
1,473
10
75-76SKG
73
76,000
65
71
78
84
96
115
133
207
281
1.23
74
59
100-76SKG
98
76,000
86
92
98
104
116
135
153
227
301
1.23
74
80
EZ 75-76
75
76,000
66
72
78
84
96
115
133
206
279
1.22
73
62
75
76,000
67
73
79
85
98
116
135
209
282
1.23
74
61
EZ 100-76
EZ 75-76PDV
100
76,000
86
92
98
104
116
135
153
226
299
1.22
73
82
EZ 100-76PDV
100
76,000
87
93
99
106
118
136
155
229
303
1.23
74
81
67
135,000
64
75
86
97
118
151
183
313
443
2.16
130
31
EZ 75-135
EZ 80-156
80
156,000
76
89
101
114
139
176
214
364
513
2.50
150
32
EZ 80-199
80
199,000
80
96
112
128
160
207
255
446
637
3.19
191
25
EZ 90-199
90
199,000
88
104
120
136
168
215
263
454
645
3.19
191
28
EZ 100-199
100
199,000
96
112
128
144
176
223
271
462
653
3.19
191
31
60HEC-125
60
125,000
70
82
94
106
130
166
202
346
490
2.40
144
25
60HEC-150
60
150,000
70
84
98
112
140
181
223
391
558
2.79
167
21
60HEC-199
60
199,000
74
92
110
128
165
220
275
495
715
3.66
220
16
100HEC-150
100
150,000
114
129
144
159
188
233
278
456
634
2.97
178
34
25
100HEC-199
100
199,000
118
138
157
177
216
275
334
569
804
3.92
235
100HEC-250
100
250,000
121
146
170
194
243
315
388
679
970
4.85
291
21
100HEC-300
100
300,000
120
147
175
202
258
340
423
755
1,086
5.52
331
18
100HEC-399
100
399,000
130
167
204
241
316
427
538
984
1,429
7.42
445
13
80W-250SD
80
250,000
84
104
125
145
185
246
306
549
791
4.04
242
20
100W-250SD
98
250,000
99
119
139
159
200
260
321
563
806
4.04
242
24
100W-270SD
100
270,000
102
124
145
167
211
276
342
604
865
4.36
262
23
75W-300SD
75
300,000
84
108
133
157
205
278
351
642
933
4.85
291
15
100W-300SD
100
300,000
104
128
153
177
225
298
371
662
953
4.85
291
21
66W-370SD
65
370,000
82
112
142
172
231
321
411
770
1,128
5.98
359
11
66W-399SD
65
399,999
84
117
149
181
246
343
440
828
1,216
6.46
388
10
80W-425SD
80
425,000
98
133
167
201
270
373
476
888
1,300
6.87
412
12
80W-450SD
80
450,000
100
137
173
209
282
391
500
937
1,373
7.27
436
11
80W-505SD
80
505,000
105
146
186
227
309
431
554
1,043
1,533
8.16
490
10
66W-625SD
65
625,000
103
153
204
254
355
507
658
1,264
1,870
10.10
606
6
80W-725SD
80
725,000
123
181
240
298
416
591
767
1,470
2,173
11.72
703
7
68 www.bockwaterheaters.com
Engineering Manual
DELIVERY AT 100oF RISE – OIL
TABLE 46
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
1 hr.
2 hr.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
20E
20
60,000
22
27
32
37
46
61
76
136
196
1.00
60
20
32E
32
104,000
35
43
52
60
77
103
129
231
333
1.71
102
19
32PP
32
104,000
34
43
52
61
79
105
131
237
343
1.76
106
18
33E
33
104,000
35
43
51
60
76
101
126
226
326
1.66
100
20
40E
40
126,000
43
53
63
73
94
124
155
277
400
2.04
123
20
50ES
50
140,000
52
63
75
86
109
143
177
313
449
2.27
136
22
51E
50
152,000
52
64
76
88
112
149
185
330
475
2.42
145
21
51PP
50
152,000
53
65
78
90
116
153
191
342
494
2.52
151
20
71E
68
173,000
65
78
92
105
131
171
211
370
529
2.65
159
26
72E
67
199,000
70
85
101
117
149
197
245
436
627
3.19
191
21
73E
67
242,000
73
92
112
131
170
228
286
518
751
3.87
232
17
120E
113
155,000
102
114
126
138
163
200
236
383
530
2.45
147
46
190E
113
190,000
104
119
133
148
178
223
268
447
626
2.98
179
38
241E
109
277,000
106
127
149
170
213
278
342
600
858
4.30
258
25
361E
91
415,000
106
139
172
206
272
372
471
870
1,268
6.64
399
14
541E
83
623,000
113
162
211
259
356
502
648
1,231
1,815
9.72
583
9
150E-400
175
400,000
180
214
247
281
348
448
549
951
1,353
6.70
402
26
150E-600
166
600,000
190
240
290
341
441
592
743
1,347
1,951
10.07
604
16
150E-800
157
800,000
199
266
333
400
534
735
937
1,742
2,547
13.42
805
12
200E-450
245
450,000
243
281
319
356
432
545
658
1,111
1,564
7.55
453
32
200E-650
212
650,000
232
287
341
396
505
668
832
1,486
2,140
10.90
654
19
200E-850
204
850,000
242
313
385
456
598
812
1,026
1,881
2,736
14.25
855
14
200E-1150
191
1,150,000
256
353
449
546
739
1,028
1,317
2,474
3,631
19.28
1,157
10
250E-800
271
800,000
295
363
430
497
632
834
1,036
1,844
2,652
13.47
808
20
250E-1000
257
1,000,000
302
387
472
557
726
980
1,235
2,252
3,269
16.95
1,017
15
250E-1250
247
1,250,000
311
415
519
624
833
1,146
1,459
2,712
3,965
20.88
1,253
12
250E-1500
247
1,500,000
337
464
591
718
973
1,355
1,736
3,263
4,790
25.45
1,527
10
Engineering Manual
69
DELIVERY AT 120oF RISE – POWER GAS, ATMOSPHERIC GAS, ENERGY SAVERS
TABLE 47
DELIVERY (GAL)
Model
Volume
Input
45 min.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
5 min.
10 min.
15 min.
20 min.
30 min.
1 hr.
2 hr.
32PG
32
104,000
32
39
46
53
67
87
108
191
274
1.38
83
23
32PPG
32
104,000
33
39
46
53
67
88
109
192
275
1.38
83
23
33PG
33
104,000
33
40
46
53
67
87
108
189
271
1.36
82
24
40PG
40
126,000
40
49
57
66
82
108
133
234
335
1.68
101
24
50ESPG
50
140,000
47
56
65
73
91
118
144
251
357
1.77
106
28
51PG
50
152,000
49
59
69
79
99
129
159
278
397
1.99
119
25
71PG
68
173,000
61
71
82
92
114
145
177
304
432
2.12
127
32
72PG
67
199,000
64
77
90
103
128
167
205
358
511
2.55
153
26
73PG
67
242,000
67
82
98
113
144
190
236
422
607
3.09
185
22
120PG
113
155,000
98
108
118
128
148
178
208
328
448
2.00
120
56
190PG
113
190,000
97
109
121
133
157
193
229
372
516
2.39
144
47
241PG
109
277,000
101
119
136
154
189
242
295
507
719
3.53
212
31
18
361PG
91
385,000
97
122
147
172
223
298
374
676
978
5.04
302
541PG
83
623,000
102
141
180
220
298
416
533
1,004
1,474
7.84
471
11
175
400,000
170
198
225
252
307
388
470
797
1,124
5.45
327
32
150G-400
150G-600
166
600,000
177
218
259
299
381
504
627
1,118
1,609
8.18
491
20
150G-800
157
800,000
183
238
292
347
456
620
783
1,438
2,093
10.92
655
14
200G-450
245
450,000
231
262
292
323
384
476
568
936
1,304
6.13
368
40
200G-650
212
650,000
218
262
306
351
439
572
705
1,237
1,769
8.87
532
24
200G-850
204
850,000
225
283
340
398
514
688
862
1,557
2,252
11.58
695
18
200G-1150
191
1,150,000
235
313
391
470
627
862
1,097
2,038
2,979
15.68
941
12
250G-800
271
800,000
276
331
386
440
549
713
877
1,532
2,187
10.92
655
25
250G-1000
257
1,000,000
278
346
415
483
619
824
1,028
1,846
2,664
13.63
818
19
14
250G-1250
247
1,250,000
287
373
458
543
714
969
1,225
2,248
3,271
17.05
1,023
250G-1500
247
1,500,000
304
406
509
611
815
1,122
1,429
2,656
3,883
20.45
1,227
12
75-76SKG
73
76,000
64
69
75
80
90
105
121
182
244
1.03
62
71
100-76SKG
98
76,000
85
90
95
100
110
126
141
203
264
1.03
62
95
EZ 75-76
75
76,000
65
70
75
80
90
106
121
182
242
1.01
61
74
73
75
76,000
66
71
76
81
92
107
122
184
246
1.03
62
EZ 100-76
EZ 75-76PDV
100
76,000
85
90
95
100
110
126
141
202
262
1.01
61
99
EZ 100-76PDV
100
76,000
86
91
96
102
112
127
143
204
266
1.03
62
97
EZ 75-135
67
135,000
63
72
81
90
108
135
162
270
378
1.80
108
37
EZ 80-156
80
156,000
74
85
95
106
126
158
189
314
439
2.08
125
38
EZ 80-199
80
199,000
77
91
104
117
144
183
223
383
542
2.65
159
30
EZ 90-199
90
199,000
85
99
112
125
152
191
231
391
550
2.65
159
34
38
EZ 100-199
100
199,000
93
107
120
133
160
199
239
399
558
2.65
159
60HEC-125
60
125,000
68
78
88
98
118
148
178
298
418
2.00
120
30
60HEC-150
60
150,000
67
79
91
102
126
160
195
335
474
2.33
140
26
60HEC-199
60
199,000
70
86
101
116
147
193
238
422
605
3.05
183
20
100HEC-150
100
150,000
111
124
136
149
173
211
248
397
545
2.48
149
40
100HEC-199
100
199,000
115
131
148
164
197
246
295
491
687
3.27
196
31
100HEC-250
100
250,000
117
137
158
178
218
279
340
582
825
4.04
243
25
100HEC-300
100
300,000
115
138
161
184
230
299
368
644
920
4.60
276
22
100HEC-399
100
399,000
124
155
186
217
279
371
464
835
1,207
6.19
371
16
80W-250SD
80
250,000
81
98
115
131
165
216
266
468
670
3.37
202
24
100W-250SD
98
250,000
95
112
129
146
179
230
280
482
684
3.37
202
29
100W-270SD
100
270,000
98
116
135
153
189
244
298
516
735
3.64
218
28
75W-300SD
75
300,000
80
100
121
141
181
242
302
545
787
4.04
242
19
100W-300SD
100
300,000
100
120
141
161
201
262
322
565
807
4.04
242
25
66W-370SD
65
370,000
77
102
127
152
201
276
351
650
949
4.98
299
13
66W-399SD
65
399,999
79
106
133
160
214
294
375
698
1,022
5.39
323
12
80W-425SD
80
425,000
93
121
150
178
236
322
407
751
1,094
5.72
343
14
80W-450SD
80
450,000
94
125
155
185
246
337
428
791
1,155
6.06
364
13
80W-505SD
80
505,000
98
132
166
200
268
370
472
880
1,288
6.80
408
12
66W-625SD
65
625,000
94
136
178
220
305
431
557
1,062
1,567
8.42
505
8
80W-725SD
80
725,000
113
162
210
259
357
503
650
1,236
1,822
9.76
586
8
70 www.bockwaterheaters.com
Engineering Manual
DELIVERY AT 120oF RISE – OIL
TABLE48
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
1 hr.
2 hr.
3 hr.
20E
20
60,000
21
25
29
33
42
54
66
116
166
0.83
50
24
32E
32
104,000
33
40
48
55
69
90
112
197
282
1.42
85
23
32PP
32
104,000
33
40
48
55
70
92
114
202
290
1.47
88
22
33E
33
104,000
33
40
47
54
68
89
110
193
276
1.39
83
24
40E
40
126,000
41
49
58
66
83
109
135
237
339
1.70
102
24
50ES
50
140,000
50
59
69
78
97
126
154
267
381
1.89
113
26
51E
50
152,000
50
60
70
80
100
130
161
282
402
2.01
121
25
51PP
50
152,000
51
61
72
82
103
135
166
292
418
2.10
126
24
71E
68
173,000
63
74
85
96
118
151
184
317
449
2.21
132
31
72E
67
199,000
67
80
93
107
133
173
213
372
531
2.65
159
25
73E
67
242,000
70
86
102
118
150
199
247
441
635
3.23
194
21
120E
113
155,000
99
110
120
130
151
181
212
334
457
2.04
122
55
190E
113
190,000
101
114
126
138
163
201
238
387
536
2.49
149
45
241E
109
277,000
102
120
138
156
192
246
299
514
729
3.58
215
30
361E
91
415,000
100
128
156
184
239
322
405
737
1,069
5.54
332
16
541E
83
623,000
105
146
186
227
308
429
551
1,037
1,523
8.10
486
10
150E-400
175
400,000
174
202
230
258
314
398
482
817
1,152
5.58
335
31
150E-600
166
600,000
181
223
265
307
391
516
642
1,145
1,648
8.38
503
20
150E-800
157
800,000
188
243
299
355
467
635
803
1,474
2,145
11.18
671
14
200E-450
245
450,000
237
268
299
331
394
488
582
959
1,336
6.28
377
39
200E-650
212
650,000
223
269
314
359
450
586
723
1,268
1,813
9.08
545
23
200E-850
204
850,000
230
290
349
409
528
706
884
1,597
2,310
11.88
713
17
200E-1150
191
1,150,000
240
321
401
481
642
883
1,124
2,088
3,052
16.07
964
12
250E-800
271
800,000
284
340
396
452
564
733
901
1,574
2,247
11.22
673
24
250E-1000
257
1,000,000
288
359
429
500
641
853
1,065
1,912
2,759
14.12
847
18
250E-1250
247
1,250,000
293
380
467
554
728
989
1,250
2,294
3,338
17.40
1,044
14
250E-1500
247
1,500,000
316
422
528
634
846
1,164
1,483
2,756
4,029
21.22
1,273
12
Engineering Manual
71
DELIVERY AT 140oF RISE – POWER GAS, ATMOSPHERIC GAS, ENERGY SAVERS
TABLE 49
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
1 hr.
2 hr.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
32PG
32
104,000
Not recommended for 180°F water
32PPG
32
104,000
Not recommended for 180°F water
33PG
33
104,000
Not recommended for 180°F water
40PG
40
126,000
50ESPG
50
140,000
46
53
61
68
84
106
129
220
312
1.52
91
51PG
50
152,000
48
56
65
73
90
116
142
244
346
1.71
102
29
71PG
68
173,000
59
68
77
86
104
132
159
268
377
1.82
109
37
Not recommended for 180°F water
33
72PG
67
199,000
63
73
84
95
117
150
183
314
446
2.19
131
31
73PG
67
242,000
64
78
91
104
131
170
210
369
527
2.65
159
25
120PG
113
155,000
96
105
113
122
139
165
191
294
397
1.72
103
66
190PG
113
190,000
96
106
116
126
147
178
208
331
454
2.05
123
55
241PG
109
277,000
99
114
129
144
174
220
265
447
629
3.03
182
36
361PG
91
385,000
93
115
136
158
201
266
331
590
849
4.32
259
21
83
623,000
96
130
163
197
264
365
466
869
1,273
6.72
403
12
150G-400
541PG
175
400,000
167
190
214
237
284
354
424
705
986
4.68
281
37
24
150G-600
166
600,000
171
206
241
276
346
452
557
978
1,399
7.02
421
150G-800
157
800,000
175
222
269
315
409
549
689
1,250
1,811
9.35
561
17
200G-450
245
450,000
227
253
280
306
359
438
517
833
1,149
5.27
316
47
200G-650
212
650,000
211
249
287
325
401
515
629
1,085
1,541
7.60
456
28
200G-850
204
850,000
216
266
316
365
465
614
763
1,359
1,955
9.93
596
21
200G-1150
191
1,150,000
223
290
358
425
559
761
962
1,768
2,574
13.43
806
14
250G-800
271
800,000
268
315
362
409
502
642
783
1,344
1,905
9.35
561
29
250G-1000
257
1,000,000
269
327
385
444
561
736
911
1,612
2,313
11.68
701
22
250G-1250
247
1,250,000
275
348
421
494
641
860
1,079
1,956
2,833
14.62
877
17
250G-1500
247
1,500,000
290
377
465
553
728
991
1,254
2,306
3,358
17.53
1,052
14
75-76SKG
73
76,000
64
68
72
77
86
99
112
165
217
0.88
53
83
111
100-76SKG
98
76,000
84
88
93
97
106
119
132
185
238
0.88
53
EZ 75-76
75
76,000
64
69
73
77
86
99
112
164
216
0.87
52
86
EZ 75-76PDV
75
76,000
65
70
74
78
87
100
114
166
219
0.88
53
85
EZ 100-76
100
76,000
84
89
93
97
106
119
132
184
236
0.87
52
115
EZ 100-76PDV
100
76,000
85
90
94
99
107
121
134
187
239
0.88
53
114
43
EZ 75-135
67
135,000
61
69
77
84
100
123
146
239
331
1.54
93
EZ 80-156
80
156,000
73
82
91
100
118
144
171
278
385
1.78
107
45
EZ 80-199
80
199,000
75
87
98
110
132
166
201
337
474
2.28
137
35
EZ 90-199
90
199,000
83
95
106
118
140
174
209
345
482
2.28
137
40
EZ 100-199
100
199,000
91
103
114
126
148
182
217
353
490
2.28
137
44
35
60HEC-125
60
125,000
66
75
83
92
109
135
160
263
366
1.71
103
60HEC-150
60
150,000
66
76
86
96
116
146
175
295
415
1.99
120
30
60HEC-199
60
199,000
68
81
94
108
134
173
212
369
526
2.62
157
23
100HEC-150
100
150,000
110
120
131
142
163
195
227
354
481
2.12
127
47
100HEC-199
100
199,000
113
127
141
155
183
225
267
435
603
2.80
168
36
100HEC-250
100
250,000
114
132
149
166
201
253
305
513
721
3.47
208
29
100HEC-300
100
300,000
112
131
151
171
210
269
329
565
802
3.94
237
25
100HEC-399
19
100
399,000
120
146
173
199
252
332
411
729
1,048
5.30
318
80W-250SD
80
250,000
78
93
107
122
151
194
237
410
583
2.89
173
28
100W-250SD
98
250,000
93
107
122
136
165
208
252
425
598
2.89
173
34
100W-270SD
100
270,000
96
111
127
142
174
220
267
454
641
3.12
187
32
75W-300SD
75
300,000
77
95
112
129
164
216
268
476
683
3.46
208
22
100W-300SD
100
300,000
97
115
132
149
184
236
288
496
703
3.46
208
29
66W-370SD
65
370,000
73
95
116
137
180
244
308
565
821
4.27
256
15
14
66W-399SD
65
399,999
75
98
121
144
191
260
329
606
883
4.62
277
80W-425SD
80
425,000
89
113
138
162
211
285
358
653
947
4.91
294
16
80W-450SD
80
450,000
90
116
142
168
220
298
376
687
999
5.19
312
15
14
80W-505SD
80
505,000
93
122
151
181
239
326
414
764
1,113
5.83
350
66W-625SD
65
625,000
88
124
160
196
268
377
485
918
1,351
7.22
433
9
80W-725SD
80
725,000
106
148
190
231
315
441
566
1,068
1,570
8.37
502
10
72 www.bockwaterheaters.com
Engineering Manual
DELIVERY AT 140oF RISE – OIL
TABLE 50
DELIVERY (GAL)
Model
Volume
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
1 hr.
2 hr.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
20E
20
60,000
Not recommended for 180°F water
32E
32
104,000
Not recommended for 180°F water
32PP
32
104,000
Not recommended for 180°F water
33E
33
104,000
Not recommended for 180°F water
40E
40
126,000
50ES
50
140,000
49
57
65
73
89
113
138
235
332
1.62
97
31
51E
50
152,000
48
57
66
74
92
117
143
247
351
1.73
104
29
51PP
50
152,000
49
58
67
76
94
121
148
256
364
1.80
108
28
71E
68
173,000
61
71
80
90
109
137
166
279
392
1.89
113
36
72E
67
199,000
65
76
88
99
122
156
190
327
463
2.28
137
29
73E
67
242,000
67
81
95
109
137
178
220
386
552
2.77
166
24
120E
113
155,000
98
107
116
124
142
168
194
299
404
1.75
105
65
190E
113
190,000
99
110
121
131
153
185
217
344
472
2.13
128
53
241E
109
277,000
100
115
130
146
177
223
269
453
637
3.07
184
36
361E
91
415,000
97
120
144
168
215
286
357
642
927
4.74
285
19
541E
83
623,000
99
134
169
204
273
377
481
898
1,315
6.94
417
12
150E-400
175
400,000
170
194
218
242
290
362
433
720
1,007
4.78
287
37
150E-600
166
600,000
175
211
247
283
355
462
570
1,001
1,432
7.18
431
23
150E-800
157
800,000
180
227
275
323
419
563
707
1,282
1,857
9.58
575
16
200E-450
245
450,000
232
259
286
313
367
447
528
851
1,174
5.38
323
46
200E-650
212
650,000
217
255
294
333
411
528
645
1,112
1,579
7.78
467
27
200E-850
204
850,000
222
273
324
375
477
629
782
1,393
2,004
10.18
611
20
200E-1150
191
1,150,000
229
298
366
435
573
779
986
1,812
2,638
13.77
826
14
250E-800
271
800,000
276
324
372
420
516
661
805
1,382
1,959
9.62
577
28
250E-1000
257
1,000,000
278
339
399
460
581
762
944
1,670
2,396
12.10
726
21
250E-1250
247
1,250,000
281
355
430
505
654
877
1,101
1,996
2,891
14.92
895
17
250E-1500
247
1,500,000
300
391
482
573
755
1,028
1,301
2,392
3,483
18.18
1,091
14
Engineering Manual
Not recommended for 180°F water
73
TABLE 51
Measuring Combustion Efficiency Using Oxygen (O2)
NET STACK TEMPERATURE IN DEGREES FAHRENHEIT (°F)
NO. 2 GRADE FUEL OIL
NATURAL GAS
FUEL
%02
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
1
87.9
86.8
85.7
84.6
83.6
82.5
81.4
80.3
79.2
78.2
77.1
76.0
74.9
73.9
72.8
71.7
70.6
2
87.8
86.7
85.5
84.4
83.3
82.2
81.0
79.9
78.8
77.7
76.5
75.4
74.3
73.2
72.1
70.9
69.8
3
87.7
86.5
85.3
84.2
83.0
81.8
80.6
79.5
78.3
77.1
75.9
74.8
73.6
72.4
71.2
70.1
68.9
4
87.6
86.3
85.1
83.9
82.7
81.4
80.2
79.0
77.7
76.5
75.3
74.0
72.8
71.6
70.4
69.1
67.9
5
87.5
86.2
84.9
83.6
82.3
81.0
79.7
78.4
77.1
75.8
74.5
73.2
71.9
70.6
69.3
68.0
66.8
6
87.3
85.9
84.6
83.2
81.8
80.5
79.1
77.8
76.4
75.0
73.7
72.3
70.9
69.6
68.2
66.8
65.5
7
87.1
85.7
84.3
82.8
81.4
79.9
78.5
77.0
75.6
74.1
72.7
71.2
69.8
68.3
66.9
65.4
64.0
8
87.0
85.4
83.9
82.3
80.8
79.2
77.7
76.2
74.6
73.1
71.5
70.0
68.5
66.9
65.4
63.8
62.3
9
86.7
85.1
83.4
81.8
80.1
78.5
76.8
75.2
73.5
71.9
70.2
68.6
66.9
65.3
63.6
62.0
60.3
10
86.5
84.7
82.9
81.1
79.3
77.1
75.8
74.0
72.2
70.4
68.6
66.9
65.1
63.3
61.5
59.7
58.0
11
86.2
84.2
82.3
80.3
78.4
76.5
74.5
72.6
70.6
68.7
66.8
64.8
62.9
60.9
59.0
57.1
55.1
12
85.8
83.6
81.5
79.4
77.2
75.1
73.0
70.9
68.7
66.6
64.5
62.3
60.2
58.1
55.9
53.8
51.7
13
85.3
82.9
80.5
78.2
75.8
73.4
71.1
68.7
66.3
63.9
61.6
59.2
56.8
54.0
52.1
49.7
47.3
14
84.7
82.0
79.3
76.6
73.9
71.3
68.6
65.9
63.2
60.5
57.8
55.1
52.5
49.8
47.1
44.4
41.7
1
91.8
90.7
89.6
88.4
87.3
86.2
85.1
84.0
82.9
81.7
80.6
79.5
78.4
77.3
76.2
75.0
73.9
2
91.7
90.5
89.4
88.2
87.0
85.9
84.7
83.6
82.4
81.2
80.1
78.9
77.7
76.6
75.4
74.2
73.1
3
91.6
90.4
89.2
87.9
86.7
85.5
84.3
83.1
81.9
80.7
79.4
78.2
77.0
75.8
74.6
73.4
72.1
4
91.5
90.2
88.9
87.7
86.4
85.1
83.8
82.6
81.3
80.0
78.7
77.5
76.2
74.9
73.6
72.4
71.1
5
91.3
90.0
88.7
87.3
86.0
84.6
83.3
82.0
80.6
79.3
77.9
76.6
75.3
73.9
72.6
71.2
69.9
6
91.2
89.8
88.4
87.0
85.5
84.1
82.7
81.3
79.9
78.5
77.0
75.6
74.2
72.8
71.4
70.0
68.6
7
91.0
89.5
88.0
86.5
85.0
83.5
82.0
80.5
79.0
77.5
76.0
74.5
73.0
71.5
70.0
68.5
67.0
8
90.8
89.2
87.6
86.0
84.4
82.8
81.2
79.6
78.0
76.4
74.8
73.2
71.6
70.0
68.4
66.8
65.2
9
90.6
88.9
87.2
85.5
83.7
82.0
80.3
78.6
76.9
75.2
73.5
71.7
70.0
68.3
66.6
64.9
63.2
10
90.3
88.5
86.6
84.8
82.9
81.1
79.2
77.4
75.5
73.7
71.8
70.0
68.1
66.3
64.4
62.6
60.7
11
90.0
88.0
86.0
84.0
81.9
79.9
77.9
75.9
73.9
71.9
69.8
67.8
65.8
63.8
61.8
59.8
57.8
12
89.6
87.4
85.2
82.9
80.7
78.5
76.3
74.1
71.9
69.7
67.4
65.2
63.0
60.8
58.6
56.4
54.1
13
89.1
86.6
84.2
81.7
79.2
76.8
74.3
71.8
69.3
66.9
64.4
61.9
59.5
57.0
54.5
52.1
49.6
14
88.4
85.7
82.9
80.1
77.3
74.5
71.7
68.9
66.1
63.3
60.5
57.7
54.9
52.1
49.3
46.6
43.8
74 www.bockwaterheaters.com
Engineering Manual
GLOSSARY OF TERMS
A.F.U.E. - Annual Fuel Usage Efficiency. Ratio of annual
output of useful energy or heat to annual energy input to
heater. Only heat leaving as hot water deemed usable and
calculated as part of space heating efficiency.
A.S.M.E. - American Society of Mechanical Engineers.
BAROMETER - Device for measuring atmospheric
pressure.
BAFFLE - Object placed in appliance to change direction
of or retard flow of air, gas or mixtures of flue gases.
BTU (British Thermal Unit) - Energy required to raise the
temperature of 1 lb of water from 60°F to 61°F at 1 atmosphere
pressure.
CALORIE - Energy required to raise the temperature of
1 gram of water by 1°C at 1 atmosphere pressure.
CENTRAL SYSTEM HEATING - Unit that produces heat
from a centralized location and distributes it throughout a
structure.
CIRCULATING WATER HEATER 1. Automatic - Furnishes hot water to be stored in
separate vessel. Storage tank temperatures controlled by
thermostat installed on heater. Circulation either natural
or forced.
2. Non-automatic - Same as automatic except
thermostat installed in storage vessel.
CIRCULATING TANK SYSTEM - Water heater is
connected to separate storage tank, allowing large amounts
of hot water to be built up for use during short periods of
peak demand. Recovery to storage ratio: 1 GPH recovery to
1 gallon stored.
COIL CIRCULATION - Water heater with heat transfer
surface composed primarily of water tubes less than 1 1/2”
in internal diameter and requiring circulation.
COLD INLET TEMPERATURE - Temperature of water
coming into water heating system.
CONDUCTION - Heat transfer through a material from
more energetic particles to less energetic particles.
CONVECTION - Heat transfer occuring between a
fluid in motion and a bounding surface when the two are at
different temperatures.
DELIVERY - Amount of hot water a heater can supply,
most commonly over the period of one hour. Delivery =
Recovery + 80% of storage.
DIRECT VENT - System with indoor water heater,
combustion air connections between heater and outside
atmosphere, flue gas connections between heater and vent
cap, vent cap for outdoors so all air for combustion is obtained
from outside atmosphere and all flue gases are discharged
to outside.
DUCT - A channel, typically made from sheet metal,
through which a substance, such as air, may flow.
ELECTRODE - Conductor that transfers electric charges
into or out of another conducting medium, or that influences
the flow of current in another conducting medium.
ENERGY FACTOR - Measure of overall efficiency of
heater based on model’s recovery efficiency, standby loss
and energy inputs.
FORCED AIR - Air that is mechanically moved
using fans or blowers.
FUEL OIL - Petroleum products used as fuels.
#1 - distillate oil for vaporizing-type burners
#2 - distillate oil for general purpose burners
#4 - blended oil for use without preheating
#5 - blended oil for use with preheating
#6 - residual oil for use in burners with preheaters
using high viscosity fuel
COMBUSTION EFFICIENCY - Measurement of how well
the heating equipment is converting a specific fuel into usable
heat energy at a specific period of time in the operation of
a heating system.
FLOW CONTROL VALVE - Devices installed between
supply pipe and plumbing fixture (shower head, faucet,
etc.) to regulate water flow. Recommended for large shower
installations; can reduce water flow in half without disturbing
spray pattern for water resulting in energy savings.
COMMERCIAL WATER HEATER - Water heater with
input rate of more than 75,000 BTU/HR (gas) and 105,000
BTU/HR (oil).
FLOW RATE - Amount of water in gallons flowing in
plumbing fixture or pipe during period of time. Typically,
measured in GPM (gallons per minute).
CONDENSATE - A liquid obtained by condensation
(usually initiated by a reduction in temperature of a vapor).
Engineering Manual
75
GLOSSARY OF TERMS (continued)
GPH/GPM - (Gallons Per Hour/Gallons Per Minute)Amount of water flowing through plumbing fixture or pipe
per hour/per minute.
THERMAL EFFICIENCY - Ratio of output energy (in
water) to input energy (fuel). Output only includes what is
delivered from heater as hot water.
HEAT EXCHANGER - Device specifically designed to
transfer heat between two physically separate fluids.
VACUUM (psi) - Any pressure less than 0 psi (gage) or
14.7 psi (absolute).
HYDRONICS - Systems of heating or cooling involving
heat trasfer by a circulating fluid in a closed system of pipes.
INSTANTANEOUS WATER HEATER - Produces hot water
on demand. Heater with rated minimum recovery of 3.5 GPH
(at 100oF rise) and 4000 BTUs per hour per gallon of self-stored
water.
VALVE 1. Automatic - Valve and operator controlling gas
supply to burner(s) during normal operation of appliance.
Operator may be actuated by gas pressure on flexible
diaphragm, electrical or mechanical means or any other
means.
NATURAL GAS - Combustible mixture of methane and
higher hydrocarbons used chiefly as a fuel or raw material.
2. Semiautomatic - Valve opens manually and closes
automatically, or vice versa.
N.P.T. INLETS - National pipe thread standard.
PROPANE - Component of raw natural gas.
RADIATION - The combined processes of emission,
transmission, and absorption of energy traveling as
electromagnetic waves.
REAR OUTLET UNIT - Exhaust stack located at rear of
unit (as opposed to the top).
RECOVERY - Amount of water per hour (GPH) heater will
deliver not including storage.
ROUGHING IN - Sizes for space left around heater.
SEMI-INSTANTANEOUS - Heater has steam in tubes and
water in shell (Instantaneous: steam in shell, water in tubes).
SIZING - Procedure to estimate the total demand on a
heating unit. A properly sized heating unit will account for peak
demand times where maximum delivery will occur.
STANDBY LOSS - Amount of heat lost per hour (measured
in %) while heater is in standby mode (no water being drawn).
Loss can occur through jacket or piping.
TEMPERATURE RISE - Number of degrees (F) that
water temperature is raised to achieve the desired outlet
temperature.
BTUs.
THERM - Measurement of heat. One (1) therm = 100,000
VENTING Type A: Three (3) walls of stainless steel, used for oilfired water heaters. Withstands higher temperatures.
Type B: Single wall of aluminum, used for atmospheric
gas water heaters only.
3. Burner - Manually or mechanically operated valve
permitting control of gas flow.
4. Diaphragm-type Automatic - Device consisting of
automatic valve actuated by application of gas pressure on
flexible diaphragm.
5. Electric-type Automatic - Device actuated by
electricity for controlling gas supply.
6. Manual Main Shutoff - Manually operated valve in
gas line for completely turning on or shutting off gas supply
to appliance (pilots may have independent shutoff valves).
7. Safety Shutoff - Valve automatically closed by safety
control system or by emergency device. May be automatic
or manual type.
VENT-AIR TERMINAL - Used with direct vent water
heater, located on outside of tank. Takes in combustion air from
outside atmosphere and discharges combustion products.
1. Vent Terminal - Fitting at end of vent pipe that
directs flue products into outside atmosphere.
2. Air Intake Terminal - Fitting at inlet of air intake pipe
allowing outside atmosphere into air intake pipe.
VENT LIMITER - Limits flow of air or gas from atmospheric
diaphragm chamber of gas pressure regulator to atmosphere.
May be device or orifice.
VENTING SYSTEM - Gas vent, chimney or singlewall pipe (and vent connector, if used) assembled to form
continuous open passageway from gas appliance to outdoor
atmosphere to remove vent gasses.
ZONED HEATING - Living areas separated into different
spaces, with each space’s heat controlled independently.
Type L: Two (2) walls, inner of stainless, outer of
aluminum. For oil-fired and power gas heaters.
76 www.bockwaterheaters.com
Engineering Manual
NOTES
Engineering Manual
77
NOTES
78 www.bockwaterheaters.com
Engineering Manual
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