# Tables

```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
201 114 537
306 149 772
428 190 1,053 573 238 1,379
750 326 1,751
927
473 2,631 1,346
443 1,689 1,098
118 78
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
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
454 2,996 1,545
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
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
Max
5
NA
NA
25
NA
NA
48
NA
NA
81
NA
NA 116
NA
NA 164
NA
NA 230
NA
NA 297
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
5
NA
NA
28
NA
NA
56
NA
NA
95
NA
NA 147
NA
NA 203
NA
635
364 459
789
NA
NA 189
NA
NA 345 547
NA 261
NA
Max
NA 400
2
NA 276 334
12”
NAT
NA 375
FAN
Min
NAT
Max
NA
NA
NA
Max
580
NA
560
445
549 1,021
650
NA
NA 422
673 1,003
638
NA
NA 408
747
985
621
490
536 1,142
722
465
657 1,121
710
758
441
771 1,088
665
965
560
520 1,373
840
725
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
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
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
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
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
2,049 1,205
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
10
NA
84
31
NA
138
56
NA
207
90
NA
15
NA
NA
36
NA
152
67
NA
233
106
20
NA
NA
41
NA
NA
75
NA
250
30
NA
NA
NA
NA
NA
NA
NA
50
NA
NA
NA
NA
NA
NA
100
NA
NA
NA
NA
NA
NA
Engineering Manual
103
NA
351
143
NA
458
188
NA
582 246
1,041
853
NA
279
119
NA
384
299
131
NA
409
163
NA
501
218
724
636 278
1,144
937
408
177
606
538
236
776
686 302
1,226 1,010
454
NA
334
152
523
467
212
682
611
283
874
781 365
1,374 1,156
546
122
NA
368
172
565
508
243
742
668
325
955
858 419
1,513 1,286
648
270
137
NA
404
198
615
564
278
816
747
381 1,062
969 496
1,702 1,473
749
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
620
328
879
831
461 1,165 1,089 606
1,905 1,692
922
NA
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*
200
°F
GP
M*
10
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
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
1 hr.
2 hr.
3 hr.
OT200
100
199,999
118
165
213
260
355
498
640
1,210
1,781
9.50
570
OT250
100
250,000
129
188
246
305
423
599
775
1,481
2,186
11.75
705
9
OT299
100
299,999
140
210
279
349
489
698
907
1,745
2,582
13.96
837
7
11
OT300
125
300,000
159
230
301
373
515
729
943
1,798
2,654
14.26
855
9
OT400
125
399,999
182
276
370
464
652
934
1,216
2,344
3,473
18.81
1,128
7
OT500
125
500,000
204
320
436
553
785
1,134
1,483
2,879
4,274
23.26
1,396
5
60
125,000
88
118
148
178
238
328
418
778
1,138
6.00
360
10
60HEC-125
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
150G-400
175
400,000
225
307
389
470
634
880
1,125
2,107
3,089
16.37
982
11
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
32
100-76SKG
98
76,000
95
110
126
141
172
218
264
449
634
3.08
185
EZ 75-76
75
76,000
75
90
106
121
151
197
242
425
607
3.04
182
25
EZ 76-76PDV
75
76,000
76
92
107
122
153
199
246
430
615
3.08
185
24
EZ 100-76
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
EZ 75-135
67
135,000
81
108
135
162
216
297
378
702
1,026
5.40
324
12
EZ 80-156
80
156,000
95
126
158
189
251
345
439
813
1,188
6.24
375
13
10
EZ 80-199
80
199,000
104
144
183
223
303
422
542
1,020
1,497
7.96
478
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
80W-250SD
80
250,000
115
165
216
266
367
519
670
1,276
1,882
10.10
606
8
100W-250SD
98
250,000
129
179
230
280
381
533
684
1,291
1,897
10.10
606
10
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
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
241PG
109
277,000
136
189
242
295
401
560
719
1,355
1,991
10.60
636
10
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
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.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
45 min.
1 hr.
2 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
8
72E
67
199,000
93
133
173
213
292
412
531
1,009
1,487
7.96
478
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
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
1 hr.
2 hr.
3 hr.
OT200
100
199,999
108
146
184
222
298
412
526
982
1,439
7.60
456
13
OT250
100
250,000
117
164
211
258
352
493
634
1,198
1,763
9.40
564
11
OT299
100
299,999
126
182
237
293
405
572
740
1,410
2,080
11.16
670
9
OT300
125
300,000
145
202
259
316
430
601
772
1,456
2,140
11.40
684
11
OT400
125
399,999
163
238
313
388
539
765
990
1,893
2,796
15.05
903
8
OT500
125
500,000
181
274
367
460
646
925
1,204
2,320
3,437
18.61
1,116
7
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
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
40
100-76SKG
98
76,000
92
104
116
129
153
190
227
375
523
2.46
148
EZ 75-76
75
76,000
72
84
96
109
133
169
206
352
498
2.43
146
31
EZ 76-76PDV
75
76,000
73
85
98
110
135
172
209
356
504
2.46
148
30
EZ 100-76
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
EZ 75-135
67
135,000
75
97
118
140
183
248
313
572
832
4.32
259
16
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
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
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
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
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
1 hr.
2 hr.
3 hr.
OT200
100
199,999
102
133
165
197
260
355
450
830
1,210
6.34
380
16
OT250
100
250,000
109
148
188
227
305
423
540
1,010
1,481
7.84
470
13
OT299
100
299,999
117
163
210
256
349
489
628
1,186
1,745
9.30
558
11
OT300
125
300,000
135
183
230
278
373
515
658
1,228
1,798
9.50
570
13
OT400
125
399,999
150
213
276
338
464
652
840
1,592
2,344
12.54
752
10
OT500
125
500,000
165
243
320
398
553
785
1,018
1,948
2,879
15.51
930
8
60HEC-125
60
125,000
78
98
118
138
178
238
298
538
778
4.00
240
15
60HEC-150
60
150,000
79
102
126
149
195
265
335
614
893
4.65
279
13
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
150G-400
175
400,000
198
252
307
362
471
634
798
1,453
2,108
10.92
655
16
150G-600
166
600,000
218
299
381
463
627
872
1,118
2,100
3,082
16.37
982
10
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
200G-650
212
650,000
262
351
439
528
705
971
1,237
2,301
3,365
17.73
1,064
12
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
250G-800
271
800,000
331
440
549
658
876
1,203
1,531
2,840
4,149
21.82
1,309
12
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
EZ 76-76PDV
Volume
Input
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
75
76,000
71
81
92
102
122
153
184
307
430
2.05
123
37
EZ 100-76
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
EZ 75-135
67
135,000
72
90
108
126
162
216
270
486
702
3.60
216
19
EZ 80-156
80
156,000
85
106
126
147
189
251
314
563
813
4.16
250
19
EZ 80-199
80
199,000
91
117
144
170
223
303
383
701
1,020
5.31
319
15
17
EZ 90-199
90
199,000
99
125
152
178
231
311
391
709
1,028
5.31
319
EZ 100-199
100
199,000
107
133
160
186
239
319
399
717
1,036
5.31
319
19
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
80W-505SD
80
505,000
132
200
268
336
472
676
880
1,696
2,512
13.60
816
6
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
71PG
68
173,000
71
92
114
135
177
241
304
559
813
4.24
254
16
72PG
67
199,000
77
103
128
154
205
282
358
665
971
5.11
307
13
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
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
10 min.
15 min.
20 min.
30 min.
45 min.
1 hr.
2 hr.
3 hr.
OT200
100
199,999
97
124
151
179
233
314
396
722
1,048
5.43
326
18
OT250
100
250,000
104
137
171
204
272
372
473
876
1,279
6.72
403
15
OT299
100
299,999
110
150
190
229
309
429
548
1,027
1,505
7.97
478
13
OT300
125
300,000
128
169
210
250
332
454
576
1,065
1,554
8.15
489
15
OT400
125
399,999
141
195
249
302
410
571
732
1,377
2,022
10.75
645
12
OT500
125
500,000
154
220
287
353
486
686
885
1,682
2,480
13.29
797
9
60
125,000
75
92
109
126
160
212
263
469
675
3.43
206
17
15
60HEC-125
Volume
Input
5 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
60HEC-150
60
150,000
76
96
116
136
175
235
295
534
774
3.99
239
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
150G-400
175
400,000
190
237
283
330
424
564
704
1,265
1,826
9.35
561
19
150G-600
166
600,000
206
276
346
417
557
767
978
1,820
2,662
14.03
842
12
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
250G-1000
257
1,000,000
327
444
561
678
912
1,262
1,613
3,016
4,419
23.38
1,403
11
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
56
100-76SKG
98
76,000
88
97
106
115
132
159
185
291
396
1.76
106
EZ 75-76
75
76,000
69
77
86
95
112
138
164
269
373
1.74
104
43
EZ 76-76PDV
75
76,000
70
78
87
96
114
140
166
272
377
1.76
106
43
EZ 100-76
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
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
16
100W-270SD
100
270,000
111
142
174
205
267
361
454
828
1,202
6.23
374
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
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
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
10 min.
15 min.
20 min.
30 min.
45 min.
1 hr.
2 hr.
OT200
100
199,999
94
118
141
165
213
284
355
640
925
4.75
285
21
OT250
100
250,000
99
129
158
188
246
334
423
775
1,128
5.88
353
17
OT299
100
299,999
105
140
175
210
279
384
489
907
1,326
6.98
419
14
OT300
125
300,000
123
159
194
230
301
408
515
943
1,371
7.13
428
18
OT400
125
399,999
135
182
229
276
370
511
652
1,216
1,780
9.40
564
13
OT500
125
500,000
146
204
262
320
436
611
785
1,483
2,181
11.63
698
11
60
125,000
73
88
103
118
148
193
238
418
598
3.00
180
20
60HEC-125
Volume
Input
5 min.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
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
150G-400
175
400,000
184
225
266
307
389
511
634
1,125
1,616
8.18
491
21
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
64
100-76SKG
98
76,000
87
95
102
110
126
149
172
264
357
1.54
92
EZ 75-76
75
76,000
68
75
83
90
106
128
151
242
334
1.52
91
49
EZ 76-76PDV
75
76,000
68
76
84
92
107
130
153
246
338
1.54
92
49
EZ 100-76
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
67
135,000
67
81
94
108
135
175
216
378
540
2.70
162
25
EZ 75-135
EZ 80-156
80
156,000
80
95
111
126
158
204
251
439
626
3.12
187
26
EZ 80-199
80
199,000
84
104
124
144
183
243
303
542
781
3.98
239
20
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
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
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
361PG
91
385,000
109
147
185
223
298
412
525
978
1,432
7.56
454
12
541PG
83
623,000
121
180
239
298
416
592
768
1,474
2,180
11.76
706
7
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
10 min.
15 min.
20 min.
30 min.
45 min.
1 hr.
2 hr.
OT200
100
199,999
91
112
133
154
197
260
323
577
830
4.22
253
24
OT250
100
250,000
96
122
148
174
227
305
383
697
1,010
5.22
313
19
OT299
100
299,999
101
132
163
194
256
349
442
814
1,186
6.20
372
16
OT300
125
300,000
119
151
183
214
278
373
468
848
1,228
6.34
380
20
OT400
125
399,999
129
171
213
255
338
464
589
1,091
1,592
8.36
502
15
OT500
125
500,000
139
191
243
294
398
553
708
1,328
1,948
10.34
620
12
60
125,000
71
84
98
111
138
178
218
378
538
2.67
160
22
60HEC-125
Volume
Input
5 min.
3 hr.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
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
150G-400
175
400,000
179
216
252
288
361
470
579
1,015
1,451
7.27
436
24
15
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
72
100-76SKG
98
76,000
86
93
100
107
120
141
161
244
326
1.37
82
EZ 75-76
75
76,000
67
74
80
87
101
121
141
222
303
1.35
81
55
EZ 76-76PDV
75
76,000
68
74
81
88
102
122
143
225
307
1.37
82
55
EZ 100-76
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
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
71PG
68
173,000
64
78
92
107
135
177
220
389
559
2.83
170
24
72PG
67
199,000
69
86
103
120
154
205
256
460
665
3.41
204
20
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
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
10 min.
15 min.
20 min.
30 min.
45 min.
1 hr.
2 hr.
3 hr.
OT200
100
199,999
89
108
127
146
184
241
298
526
754
3.80
228
26
OT250
100
250,000
94
117
141
164
211
282
352
634
916
4.70
282
21
OT299
100
299,999
98
126
154
182
237
321
405
740
1,075
5.58
335
18
OT300
125
300,000
116
145
173
202
259
344
430
772
1,114
5.70
342
22
OT400
125
399,999
125
163
200
238
313
426
539
990
1,442
7.52
451
17
OT500
125
500,000
134
181
227
274
367
506
646
1,204
1,762
9.30
558
13
60
125,000
70
82
94
106
130
166
202
346
490
2.40
144
25
60HEC-125
Volume
Input
5 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
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
100HEC-199
100
199,000
118
138
157
177
216
275
334
569
804
3.92
235
25
100HEC-250
100
250,000
121
146
170
194
243
315
388
679
970
4.85
291
21
150G-400
175
400,000
176
209
241
274
340
438
536
929
1,322
6.55
393
27
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
EZ 76-76PDV
75
76,000
67
73
79
85
98
116
135
209
282
1.23
74
61
EZ 100-76
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
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
21
100W-300SD
100
300,000
104
128
153
177
225
298
371
662
953
4.85
291
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
12
80W-425SD
80
425,000
98
133
167
201
270
373
476
888
1,300
6.87
412
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
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
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
5 min.
10 min.
15 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
20 min.
30 min.
45 min.
1 hr.
2 hr.
3 hr.
OT200
100
199,999
86
102
118
133
165
213
260
450
640
3.17
190
32
OT250
100
250,000
90
109
129
148
188
246
305
540
775
3.92
235
26
OT299
100
299,999
93
117
140
163
210
279
349
628
907
4.65
279
21
OT300
125
300,000
111
135
159
183
230
301
373
658
943
4.75
285
26
OT400
125
399,999
119
150
182
213
276
370
464
840
1,216
6.27
376
20
OT500
125
500,000
126
165
204
243
320
436
553
1,018
1,483
7.75
465
16
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
150G-400
175
400,000
170
198
225
252
307
388
470
797
1,124
5.45
327
32
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
250G-1250
247
1,250,000
287
373
458
543
714
969
1,225
2,248
3,271
17.05
1,023
14
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
95
100-76SKG
98
76,000
85
90
95
100
110
126
141
203
264
1.03
62
EZ 75-76
75
76,000
65
70
75
80
90
106
121
182
242
1.01
61
74
EZ 76-76PDV
75
76,000
66
71
76
81
92
107
122
184
246
1.03
62
73
EZ 100-76
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
EZ 100-199
100
199,000
93
107
120
133
160
199
239
399
558
2.65
159
38
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
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
361PG
91
385,000
97
122
147
172
223
298
374
676
978
5.04
302
18
541PG
83
623,000
102
141
180
220
298
416
533
1,004
1,474
7.84
471
11
70 www.bockwaterheaters.com
Engineering Manual
DELIVERY AT 120oF RISE – OIL
TABLE48
DELIVERY (GAL)
Model
Volume
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
Input
5 min.
10 min.
15 min.
20 min.
30 min.
45 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH)
contents
71
DELIVERY AT 140oF RISE – POWER GAS, ATMOSPHERIC GAS, ENERGY SAVERS
TABLE 49
DELIVERY (GAL)
Model
20 min.
30 min.
45 min.
1 hr.
2 hr.
3 hr.
OT200
100
199,999
84
97
111
124
151
192
233
396
559
2.72
163
37
OT250
100
250,000
87
104
120
137
171
221
272
473
675
3.36
202
30
OT299
100
299,999
90
110
130
150
190
249
309
548
788
3.99
239
25
OT300
125
300,000
108
128
149
169
210
271
332
576
821
4.07
244
31
OT400
125
399,999
114
141
168
195
249
329
410
732
1,055
5.37
322
23
OT500
125
500,000
121
154
187
220
287
387
486
885
1,284
6.65
399
19
60
125,000
66
75
83
92
109
135
160
263
366
1.71
103
35
60HEC-125
Volume
Input
5 min.
10 min.
15 min.
Mins. to
Recovery Recovery recover
(GPM)
(GPH) contents
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
150G-400
175
400,000
167
190
214
237
284
354
424
705
986
4.68
281
37
150G-600
166
600,000
171
206
241
276
346
452
557
978
1,399
7.02
421
24
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
100-76SKG
98
76,000
84
88
93
97
106
119
132
185
238
0.88
53
111
EZ 75-76
75
76,000
64
69
73
77
86
99
112
164
216
0.87
52
86
EZ 76-76PDV
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
EZ 75-135
67
135,000
61
69
77
84
100
123
146
239
331
1.54
93
43
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
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
66W-399SD
65
399,999
75
98
121
144
191
260
329
606
883
4.62
277
14
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
71PG
68
173,000
59
68
77
86
104
132
159
268
377
1.82
109
37
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
541PG
83
623,000
96
130
163
197
264
365
466
869
1,273
6.72
403
12
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)
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. Noutomatic - 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
```