MIGHTY THERM AP Powerful, Efficient,
MIGHTY
THERM AP
Gas Fired Commercial
Pool Heating Boiler
Powerful,
Efficient,
Reliable and
Economical
®
Heating Systems Company
®
A subsidiary of BRADFORD WHITE Corporation
Mighty Therm Standard Features
Mighty Therm Model AP
energy efficient, compact
pool heating boilers are
designed for commercial,
institutional and large
residential pools where
economical performance
and rapid heat-up are
needed. The Mighty
Therm AP is available in
indoor and outdoor
models with twenty-two
sizes from 500,000 to
5,000,000 BTU/H to
precisely match any
heating requirement.
Primary/secondary pump
and control on Models 5001825 include the following
features:
• Electronic controller with a
solid state sensor and
adjustable differential provides
accurate temperature control.
• Preheated inlet water
eliminates condensation.
• Constant velocity in heat
exchanger increases tube life.
• Elimination of diverter valve in
pool circulation line results in
lower installation and
operating costs.
• Inlet and outlet thermometers
with +
_1% accuracy allow
precise set-up and monitoring
of temperature rise.
Greater energy efficiencies
as high as 82% are achieved
through the use of integral finned
copper tubes which are rolled
directly into the headers.
Conformal heat exchanger baffles
and an eight-fins-per-inch tubing
configuration maximize
combustion heat extraction.
Design certified to ANSI
Z21.56 Standard for Gas-Fired Pool
Heaters. Outdoor 500-1825 units
are certified for use without the
addition of a draft diverter or
external vent. Indoor units
incorporate a built-in draft diverter
and require only vent piping.
Working pressure of 160 psi
complies with Section IV of the
ASME Boiler and Pressure Vessel
Code. Units are registered with the
National Board of Boiler and
Pressure Vessel Inspectors.
Heat exchanger header
covers are field removable for
complete inspection of tubing and
header passages. The heat
exchanger is replaceable without
disassembly of the burners or
combustion chamber.
Pressure relief valve is ASME
rated and is selected to provide
discharge capacity in excess of unit
heating input.
Combustion chamber is cast
refractory with 2000°F (1093°C)
working temperature.
Burners are atmospheric type
constructed of AISI alloy 430
(models 500 - 1825) or AISI 439
(models 2000 - 5000) stainless steel.
Chassis and jacket parts are
of galvanized steel meeting ASTM
Standard for G90 coating. Exterior
is finished with acrylic paint,
thermoset at 325°F (163°C).
Salt water models (5001825) are available with cupronickel alloy heat exchanger tubes
and bronze headers and header
covers.
One-year limited warranty
covers the controls, pump, heat
exchanger tubes and combustion
chamber against defects in
materials and workmanship. Refer
to the warranty sheet enclosed with
each unit for further details.
Control system includes
automatic temperature control,
temperature limit, gas pressure
regulator, redundant electric gas
valve, water flow sensing,
electronic flame safety supervision
and manual gas shut-off valve. The
standard control system operates
on 24 VAC with a 120 VAC power
supply. Standard units are
intermittent (spark) ignition.
Integral flow control valve
on models 2000 - 5000 accepts
flows up to 300 GPM.
Model Sizing
For Indoor Pools
The selection charts below will assist in choosing
the correct size boiler for an indoor pool. First,
calculate the surface area of the pool in square feet.
Second, refer to the selection chart for either an
indoor or outdoor boiler. Third, find the closest
square footage in the 10°(F) Temperature Difference
column, and the boiler model which corresponds to
it. For normal conditions Laars recommends using
the 10° Temperature Difference columns; this will
provide a temperature increase of approximately 6°F
per 24 hour period.
Indoor Model I
For Outdoor Pools
The selection charts below will assist in choosing the
correct size boiler for an outdoor pool. First, determine
the difference between the desired pool temperature
and the average air temperature during the coldest
month in which the pool will be used (referred to in the
chart below as “Temperature Difference”). Second,
calculate the surface area of the pool in square feet.
Third, refer to the selection charts. Listed are the
maximum pool surface areas for each boiler model with
typical temperature differences. Make the appropriate
selection from the separate charts for indoor or outdoor
installed boiler models.
Temperature Difference
10°F
6°C
15°F
8°C
20°F
11°C
25°F
14°C
45°F
25°C
50°F
28°C
500 I
3900
362
2600
242
1950
181
1560
145
1300
121
1115
104
975
600 I
715 I
4680
5580
435
518
3120
3720
290
346
2340
2790
217
259
1870
2230
174
207
1560
1860
145
173
1340
1595
124
148
1170
1395
91
870
81
780
72
109
130
1040
1240
97
115
935
1115
87
104
850 I
1010 I
6630
7880
616
732
4420
5250
411
488
3315
3940
308
366
2650
3150
246
293
2210
2625
205
244
1895
2259
176
210
1660
1970
154
183
1475
1750
137
163
1325
1575
123
146
1200 I
1430 I
9360
11155
870
1036
6240
7435
580
691
4680
5580
435
518
3745
4460
348
414
3120
3720
290
346
2675
3190
249
296
2340
2790
217
259
2080
2480
193
230
1870
2230
174
207
1670 I
1825 I
13025
14235
1210
1322
8685
9490
807
882
6515
7120
605
661
5210
5695
484
528
4340
4745
403
441
3720
4070
346
378
3260
3560
303
331
2895
3165
269
294
2605
2850
242
265
2000 I
2450 I
16400
20090
1524
1866
10935
13395
1016
1244
8200
10045
819
933
6560
8035
609
746
5465
6695
508
622
4685
5740
435
533
4100
5025
381
467
3645
4465
339
415
3280
4020
305
373
3050 I
3500 I
25010
28700
2323
2666
16675
19135
1549
1778
12505
14350
1162
1333
10000
11480
929
1066
8335
9565
744
889
7145
8200
664
764
6255
7175
581
667
5560
6380
517
593
5000
5740
465
533
4050 I
4500 I
33210
36900
3085
3428
22140
24600
2057
2285
16605
18450
1543
1714
13285
14760
1234
1371
11070
12300
1028 9490
1143 10545
882
980
8300
9225
771
857
7380
8200
686
762
6640
7380
617
686
5000 I
41000
3809
27335
2539
20500
1904
16400
1524
13665
1269
11715
1088
10250
952
9110
846
8200
762
35°F
19°C
40°F
22°C
45°F
25°C
50°F
28°C
30°F
17°C
35°F
19°C
40°F
22°C
Surface Area of Pools (sq. ft.)
Outdoor Model E
10°F
6°C
15°F
Temperature Difference
8°C
20°F
11°C
25°F
14°C
30°F
17°C
Surface Area of Pools (sq. ft.)
500 E
4000
372
2665
248
2000
186
1600
149
1330
124
1140
106
1000
93
885
82
800
74
600 E
715 E
4800
5720
446
531
3200
3810
297
354
2400
2860
223
266
1920
2285
178
212
1600
1905
149
177
1370
1630
127
151
1200
1430
111
133
1065
1270
99
118
960
1140
89
106
850 E
1010 E
6800
8080
632
751
4530
5385
421
500
3400
4040
316
375
2720
3230
253
300
2265
2690
210
250
1940
2305
180
214
1700
2020
158
188
1510
1795
140
167
1360
1615
126
150
1200 E
9600
1430 E 11440
892
1063
6400
7625
595
708
4800
5720
446
531
3840
4575
357
425
3200
3810
297
354
2740
3265
255
303
2400
2860
223
266
2130
2540
198
236
1920
2285
178
212
1670 E 13360
1825 E 14600
1241
1356
8905
9730
827
904
6680
7300
621
678
5344
5840
496
543
4450
4865
413
452
3815
4170
354
387
3340
3650
310
339
2965
3240
275
301
2670
2920
248
271
2200 E 17861
2800 E 22235
1659
2066
11907
14823
1106
1377
8930
11117
830
1033
7144
8894
664
826
5954
7412
553
689
5103
6353
474
590
4465
5559
415
516
3969
4941
369
459
3572
4447
332
413
3200 E 25515
3600 E 29525
2370
2743
17010
19683
1580
1829
12758
14762
1185
1371
10206
11810
948
1097
8505
9842
790
914
7290
8436
677
784
6379
7381
593
686
5670
6561
527
610
5103
5905
474
549
4000 E 32805
3048
21870
2032
16403
1524
13122
1219
10935
1016
9373
871
8201
762
7290
677
6561
610
4500 E 36450
3386
24300
2257
18225
1693
14580
1354
12150
1129
10414
967
9113
847
8100
752
7290
677
Notes: 1. For high altitude pools, reduce the surface area figures shown in the charts by 4% for each 1000 ft. above sea level. (No derating is necessary
up to 2000 ft. above sea level.) 2. Laars maintains a policy of continuous improvements and therefore reserves the right to change specifications
without notice. 3. Sizing for outdoor pools is based on 3½ mph average wind.
Dimensional Data
Indoor Models (I)
Gas
Connection2
Size - inches NPT
Natural4 LP 4
Water
Conn.2
Size
inches
NPT
Dimensions2 - inches cm
B
C
Shipping
Weight3
lbs
kgs
Indoor
Size
Input1
MBTU/h kW
Output1
MBTU/h kW
500 I
600 I
715 I
850 I
1010 I
1200 I
1430 I
1670 I
1825 I
500
600
715
850
1010
1200
1430
1670
1825
147
176
210
249
296
352
419
489
535
405
486
579
689
818
972
1158
1353
1478
119
143
170
202
240
285
339
396
433
1
1
1
1
1¼
1¼
1¼
1½
1½
¾
¾
¾
¾
1
1
1¼
1¼
1¼
2½
2½
2½
2½
2½
2½
2½
2½
2½
33¾
38¾
44¼
50¾
58
66¼
76
85½
92½
86
98
112
129
147
168
193
217
235
45¼
50¼
55¾
62¼
69½
77¾
87½
97
103¾
115
128
142
158
177
197
222
246
264
23¾
22¾
22¾
21¾
20¾
20¾
19¾
19¾
19¾
60
58
58
55
53
53
50
50
50
10
12
12
14
16
16
18
18
18
25
30
30
36
41
41
46
46
46
808
819
873
945
1041
1199
1280
1445
1570
367
372
396
429
473
544
581
656
713
2000 I
2450 I
3050 I
3500 I
4050 I
4500 I
5000 I
2000
2450
3050
3500
4050
4500
5000
586
718
894
1025
1186
1318
1465
1639 480
2009 589
2501 733
2870 841
3321 973
3690 1081
4100 1201
1½
1½
2
2
2
2½
2½
1¼
1½
1½
1½
2
2
2
4
4
4
4
4
4
4
55½
65½
78
88
100½
110½
123
141
166
198
224
255
281
312
73
83
95½
105½
118
128
140½
185
211
243
268
300
325
357
24½
24½
24½
24½
24½
24½
24½
62
62
62
62
62
62
62
22
24
26
28
30
32
34
56
61
66
71
76
81
86
1950
2100
2250
2510
2750
2900
3200
885
913
1022
1140
1249
1317
1453
A
Notes: 1. Input and output must be derated 4% per 1000 feet above sea level when installed above 2000 feet altitude.
2. Dimensions are nominal. 3. Integral pump included on sizes 500 - 1825.
Indoor
Sizes 500 - 1825
Indoor
Sizes 2000 - 5000
Dimensions shown in inches cm.
All specifications subject to change.
* 29" for sizes 3500-5000.
V
Design Advantages
Electronic flame
supervision
Natural or propane
Galvanized steel jacket
with acrylic finish for
strength and long life
Electronic ignition
Built-in draft diverter
(indoor models) to
simplify installation
High temperature
refractory firebox
liner - to 2000°F for
greater efficiency
Flow switch standard
on all models
Integral header flanges
for easier serviceability
Integral pump assures
proper water flow
(Models 500 - 1825)
Glass-lined or bronze
headers for
corrosion resistance
Automatic gas valve
Stainless steel burners,
with slide-out burner
tray for easy
maintenance, assures
long life
(Models 500 - 1825)
Integral lined copper
tube heat exchanger
for higher efficiency
Model configuration varies slightly by size.
Electronic temperature
control for accuracy
(Models 500 - 1825)
Dimensional Data
Outdoor Models (E)
Outdoor
Size
Input
1
MBTU/h kW
Output
1
MBTU/h kW
Gas
Connection2
Size
inches NPT
Nat4
LP 4
Water
Conn.2
Size
in.
NPT
Dimensions2 - inches cm
A
B
C
D
E
F
V
500 E
600 E
715 E
850 E
1010 E
1200 E
1430 E
1670 E
1825 E
500
600
715
850
1010
1200
1430
1670
1825
147
176
210
249
296
352
419
489
535
410
492
586
697
828
984
1173
1370
1497
120
144
172
204
243
288
344
401
439
1
1
1
1
1¼
1¼
1¼
1½
1½
¾
¾
¾
¾
1
1
1¼
1¼
1¼
2½
2½
2½
2½
2½
2½
2½
2½
2½
33¾
38¾
44¼
50¾
58
66¼
76
85½
92½
86
98
112
129
147
168
193
217
235
45¼
50¼
55¾
62¼
69½
77¾
87½
97
103¾
115
128
142
158
177
197
222
246
264
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2200 E
2800 E
3200 E
3600 E
4000 E
4500 E
2205 646
2745 804
3150 923
3645 1068
4050 1187
4500 1319
1786
2223
2552
2952
3281
3645
523
651
748
865
961
1068
1½
1½
2
2
2½
2½
1¼
1½
1½
2
2
2
4
4
4
4
4
4
65½
78
88
100½
110½
123
166
198
224
255
281
312
83
95½
105½
118
128
140½
211
243
268
300
325
357
16
20
23
29
30½
34
41
51
58
74
77
86
28¼
28¼
31½
31½
34½
37¾
72
72
80
80
88
96
15
15
16½
16½
18
19½
38
38
42
42
46
50
24
24
36
36
36
36
61
61
91
91
91
91
18
18
20
20
22
24
46
46
51
51
56
61
Notes: 1. Input and output must be derated 4% per 1000 feet above sea level when installed above 2000 feet altitude.
2. Dimensions are nominal. 3. Integral pump included on sizes 500 - 1825.
Dimensions shown in inches cm. All specifications subject to change.
Outdoor
Size
500
600
715
850
1010
1200
1430
1670
1825
2200
2800
3200
3600
4000
4500
Shipping
Weight3
lbs
kgs
855
949
1050
1100
1240
1410
1570
1622
1725
2320
2500
2840
3175
3940
3790
388
431
477
499
563
640
713
736
783
1053
1135
1289
1142
1789
1721
Outdoor
Sizes 500 - 1825
Outdoor
Sizes 2200 - 4500
800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors)
20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com
Litho in U.S.A. © Laars Heating Systems 0806 Document 3083L
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