DIMENSIONS
BW3 MODELS
RELIEF | A | |
TEMP | ||
VALVE | ||
PRESSURE | ||
| ||
| GAGE | |
| 29″ | |
| 5 5⁄8″ | |
BURNER | 1 3⁄4″ | |
| 7″ |
1 1⁄4″ SUPPLY
COMBINATION 
23 1⁄4″
LIMIT & RELAYVENT
CONTROLCONNECTOR
1 1⁄4″ RETURN |
|
| BLOWER |
25 1⁄4″ |
|
23″ | PRESSURE |
| |
5 5⁄8″ | SWITCH |
| |
| CIRCULATOR |
GAS | INT. PILOT |
VALVE | CONTROL |
LEFT SIDE | FRONT | RIGHT SIDE |
DIMENSIONS (In.)
UNIT SIZE | A | VENT CONNECTION |
042 | 11 | 4* |
075 | 4* | |
112 | 4* | |
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|
|
150 | 4* | |
187 | 24 | 4* |
225 | 4* |
| CLEARANCES (In.) | |
|
| |
RIGHT SIDE |
| 6* |
LEFT SIDE |
| 6 |
TOP |
| 6 |
BACK |
| 6 |
|
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|
FRONT |
| 6* |
*Service clearance requirement 24 in.
*With
RATINGS AND CAPACITIES*
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| RATINGS |
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| BOILER |
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| HEATING |
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| WATER | APPROX | |
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| CAPACITY‡ |
| NET RATING | ||
| GAS | MAX INPUT |
| CAPACITY | SHIP. | ||
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UNIT | TYPE | (BTUH) | Btuh | AFUE % | Btuh† | (GALLONS) | WT (Lb) |
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BW3AAN042 | Natural | 42,500 | 36,000 | 84.4 | 31,000 | 1.75 | 211 |
BW3AAN075 | Natural | 75,000 | 63,000 | 83.4 | 55,000 | 3.00 | 263 |
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BW3AAN112 | Natural | 112,500 | 94,000 | 83.0 | 82,000 | 4.25 | 320 |
BW3AAN150 | Natural | 150,000 | 125,000 | 82.7 | 109,000 | 5.50 | 369 |
BW3AAN187 | Natural | 187,500 | 155,000 | 82.3 | 135,000 | 6.75 | 418 |
*Gas input ratings are for elevations up to 2000 ft. For elevations above 2000 ft, reduce input 4% for each 1000 ft above sea level.
†Selection factors providing for piping loss and starting load are those recommended by the Institute of Boiler and Radiator Manufacturers. Net water boiler ratings are based on an allowance of 1.15.
‡In accordance with U.S. Government test procedures.