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2 - BOILER RATINGS AND CAPACITIES
Table 2 - Ratings and Capacities
BOILER MODEL
NUMBER
(1)
† NATURAL GAS † PROPANE GAS AFUE
Input
(3)
Mbh
Heating
Capacity
(3)
Mbh
(2)
NET AHRI
RATING
Water,
(3)
Mbh
HIGH
ALTITUDE
INPUT
(3)
Mbh
INPUT
(3)
Mbh
HEATING
CAPACITY
(3)
Mbh
(2)
NET
AHRI
RATING
Water,
(3)
Mbh
HIGH
ALTITUDE
INPUT
(3)
Mbh
INTERMITTENT
IGNITION
WITH VENT
DAMPER
GWB8-262E-2 262.5 220 191
236
83.9
GWB8-299E-2
299 251 218
269
83.7
GWB8-245E-2
245 206 179
220
83.9
GWB8-280E-2
280 235 204
252
83.7
†
Input rating for sea level to 2,000 ft. (610m) above sea level.
• United States, over 2000 ft (610m) above sea level. Reduce input rate 4% for every 1000 ft (304m)
above sea level.
• *Canada, 2000 ft (610m) to 4500 (1350m) above sea level, reduce input per table. Over 4500 ft
(1350m) above sea level. Contact Provincial authority having jurisdiction.
+ Heating Capacity based on D.O.E. (Department of Energy) test procedure.
(2)
Net AHRI Water rating shown based on piping and pickup allowance of 1.15. Consult manufacturer before
selecting boiler for installations having unusual piping and pickup requirements, such as intermittent
system operation, extensive piping systems, etc.
(3)
Mbh = 1,000 Btuh = British Thermal Unit Per Hour
- Ratings marked “Net AHRI Ratings” indicate amount of remaining heat input used to heat radiation or
terminal units. Net AHRI Ratings shown are based on allowance of 1.15 in accordance with factors shown on
AHRI Standard as published by The Hydronics Institute.
- Selection of boiler size should be based upon “Net AHRI Rating” being equal to or greater than calculated
heat loss of the building.
- Consult manufacturer before selecting boiler for installations having unusual piping and pickup requirements.
BOILERS FOR USE AT HIGH ALTITUDE
Boiler is factory equipped for use at altitudes of 0-2,000 feet above sea level.
For use at altitudes above 2,000 feet above sea level, input ratings are reduced by change in main burner
orifi ce size.
For altitudes above 2,000 feet above sea level, input ratings should be reduced at rate of 4% for each 1,000
feet above sea level. Consult National Fuel Gas Code, ANSI Z223.1/NFPA 54, or manufacturer for correct
orifi ce sizing information.
In Canada, a high altitude conversion kit is available to convert to altitudes of 2,000 to 4,500 feet above sea
level. Please consult your dealer.