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BOILER RATINGS AND CAPACITIES
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These low pressure gas-fired hot water boilers are design certified by CSA International for use
with natural and propane gases. The boilers are constructed and hydrostatically tested for a
maximum working pressure of 50 psig (pounds per square inch gage) in accordance with
A.S.M.E. (American Society of Mechanical Engineers) Boiler and Pressure Vessel Code Section
IV Standards for heating boilers.
++ AFUE (Annual Fuel Utilization Efficiency) and Heating Capacity is based on the D.O.E.
(Department of Energy) test procedure.
The Boilers are certified in accordance with ANSI (American National Standards Institute)
Z21.13 standards as gas-fired, direct vent, condensing, hot water boilers.
The Heating Capacity indicates the amount of heat available after subtracting the losses up the
stack. Most of this heat is available to heat water. A small portion is heat from the jacket and
surfaces of the boiler, and it is assumed that this heat stays in the structure. The Net I=B=R
Rating represents the portion of the remaining heat that can be applied to heat the radiation or
terminal units (i.e. finned tube baseboard, cast iron radiators, radiant floor, etc.). The difference
between the Heating Capacity and the Net I=B=R Rating, called the piping and pickup
allowance, establishes a reserve for heating the volume of water in the system and offsetting
heat losses from the piping. The Net I=B R Ratings shown are based on a piping and pickup
factor of 1.15 in accordance with the I=B=R Standard as published by the Hydronics Institute.
The Net I=B=R Rating of the boiler selected should be greater than or equal to the calculated
peak heating load (heat loss) for the building or area(s) served by the boiler and associated hot
water heating systems. The manufacturer should be consulted before selecting a boiler for
installations having unusual piping and pickup requirements.
BOILERS FOR USE AT HIGH ALTITUDE
The boilers are factory equipped for operation at altitudes ranging from 0-2,000 feet above sea
level. For use of these boilers at altitudes above 2,000 feet above sea level, the gas input
ratings (MBH) must be reduced.
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