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New York City MEA Number 484-84-E Vol. IV.
BOILER RATINGS & CAPACITIES
Model
Input
*Mbh
Heating
Capacity
*Mbh
**Net
AHRI
Rating
Water
*Mbh
AFUE
Vent Diameter (Inches)
To Chimney
(Category I)
Horizontal Vent
(Category III)
GWB8-042IE-2 42.5 36 31 84.4 4 3
GWB8-075IE-2 75.0 63 55 83.4 4 3
GWB8-112IE-2 112.5 94 82 83.0 4 3
GWB8-150IE-2 150.0 125 109 82.7 4 3
GWB8-187IE-2 187.5 155 135 82.3 4 4
GWB8-225IE-2 225.0 186 162 82.0 4 4
* MBH = 1,000 Btuh = British Thermal Unit Per Hour. Boilers are equipped for altitudes up to 2,000 feet only.
• U.S.A. Only - For altitudes above 2,000 feet, ratings should be reduced at the rate of 4% for each
1,000 feet above sea level.
• Canada Only - Boilers may be used at high altitude (2,000-4500 feet/640-1350m) by using a certifi ed
fi eld conversion kit, resulting in a 10% de-rate. Contact Provincial authority having jurisdiction for
installations above 4500 ft (1350m)above sea level.+ Heating Capacity based on D.O.E. (Department
of Energy) test procedure.
** Net AHRI Water Ratings i
ndicate amount of remaining heat input that can be used to heat the radiation
or terminal units. Net AHRI Ratings shown are based on an allowance of 1.15 Selection of
boiler size should be based upon “Net AHRI Rating” being equal to or greater than calculated
heat loss of building.
Manufacturer should be consulted before selecting a boiler for installations having unusual piping
and pickup requirements.
This boiler cannot be used with all types of chimneys. Read these instructions carefully before installing.
These Gas-Fired Hot Water Boilers are low pressure, sectional cast iron boilers Design Certifi ed by C.S.A. (Canadian Standards
Association) for use with Natural and Propane Gases. Constructed and hydrostatically tested for maximum working pressure of 50 psi in
accordance with A.S.M.E. Boiler and Pressure Vessel Code Section IV Standards for cast iron heating boilers.
Boilers must stand on noncombustible fl oor. If installed on combustible fl oor, please refer to Repair Parts manual for appropriate
Combustible Floor Base part number.
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.
U.S.A. Only - 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, and/or Natural Gas and Propane Installation Code, CAN/CSA B149.1,
or manufacturer for correct orifi ce sizing information.
Canada Only - For altitudes in the range of 2,000-4,500 feet (610 - 1350m) above sea level, boilers may be fi eld equipped for use
at high altitude by using a certifi ed fi eld conversion kit. The change in main burner orifi ce size results in the boiler’s input rating
being reduced by 10%.The conversion shall be carried out by a manufacturer’s authorized representative, in accordance with the
requirements of the manufacturer, provincial or territorial authorities having jurisdiction and in accordance with the requirements of
CSA-B149 Natural Gas and Propane Installation Code. The certifi ed fi eld conversion kit includes a conversion data plate, which must be
attached to the boiler adjacent to the rating plate, indicating that the boiler has been converted for high altitude use. The conversion
data plate must be fi lled in with the correct conversion information.
For altitudes over 4500 feet (1350m), contact Provincial authority having jurisdiction.
Table 1 RATINGS NATURAL AND PROPANE GASES