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Indirect Fired Water Heaters Installation and Operating Manual
Installation & Operating Manual
First Hour Rating - 180°F Boiler Loop Water (Universal Sizing - 45,000 - 295,000 Btu/hr) Table 8C
Model
SST300-80
SST450-119
Circulator Flow
(GPM)
5
8
12
16
20
5
8
12
16
20
Domestic Outlet
115
140
115
140
115
140
115
140
115
140
115
140
115
140
115
140
115
140
115
140
Boiler Heating Capacity
45,000
163
138
163
138
197
172
197
172
60,000
193
159
193
159
226
193
226
193
75,000
222
180
222
180
255
213
255
213
95,000
261
207
261
207
261
207
294
241
294
241
294
241
115,000
300
235
300
235
300
235
300
235
333
268
333
268
333
268
333
268
140,000
304
238
347
268
347
268
347
268
347
268
384
302
382
302
382
302
382
302
382
302
165,000
304
238
349
270
374
288
395
302
395
302
387
306
429
337
429
337
429
337
429
337
195,000
349
270
374
288
409
312
424
323
483
375
485
376
485
376
485
376
225,000
374
288
409
312
424
323
501
388
548
421
541
416
260,000
424
323
573
438
596
454
295,000
596
454
Max BTU Input
115,860
139,106
154,002
171,229
181,544
141,419
190,161
204,795
237,649
253,504