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DIMENSIONS
BW1 and BW2 MODELS
23
1
⁄
4
″
31
3
⁄
8
″
5
3
⁄
8
″
4
3
⁄
4
″
1
1
⁄
4
″ SUPPLY
26
1
⁄
2
″
12
1
⁄
4
″
A
8″
TEMPERATURE/
PRESSURE GAGE
SPILL
SWITCH
DRAIN VALVE
INT. PILOT
CONTROL
ROLLOUT
SWITCH
GAS
VALVE
1
1
⁄
4
″
RETURN
1
1
⁄
4
″ NPT
AQUASTAT
VENT
DAMPER
ASME
RELIEF
VALVE
LEFT SIDE RIGHT SIDEFRONT
DIMENSIONS (In
.)
UNIT SIZE A VENT CONNECTION
037 8 3
070 11-1/4 5
105 14-1/2 6
140 17-3/4 6
175 21
7
210 24-1/4 7
245 27-1/2 7
280 30-3/4 7
CLEARANCES (In.
)
*
Service clearance requirement 24 in.
RIGHT SIDE
6 (2-5 Section)
*
24 (6-9 Section)
*
LEFT SIDE
6 (2-5 Section)
24 (6-9 Section)
TOP 6
BACK 6
FRONT 6
*
RATINGS AND CAPACITIES
*
*
Ratings are for altitudes to 2000 ft. Unit ratings for altitudes over 2000 ft are 4% less for each 1000 ft above sea level.
BW1, BW2
GAS
TYPE
NUMBER
OF
SECTIONS
MAX
INPUT
(BTUH)
HEATING
CAPACITY
(BTUH)
NET
RATING
(BTUH)
AFUE %
APPROX
SHIP.
WT (Lb)BW1 BW2
AAN037 Natural 2 37,500 30,000 26,000 80.0 81.4 227
AAN070 Natural 3 70,000 57,000 50,000 80.4 81.6 285
AAN105 Natural 4 105,000 85,000 74,000 80.4 81.5 350
AAN140 Natural 5 140,000 113,000 98,000 80.3 81.3 421
AAN175 Natural 6 175,000 142,000 124,000 80.2 81.1 488
AAN210 Natural 7 210,000 170,000 148,000 80.1 81.0 564
AAN245 Natural 8 245,000 198,000 172,000 80.0 81.6 626
AAN280 Natural 9 280,000 226,000 197,000 80.0 80.7 689