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TABLE #1 – SEA LEVEL RATINGS – NATURAL AND PROPANE GASES
Model
Input
*(MBH)
++ Heating Capacity
*(MBH)
Net I=B=R Rating
*(MBH)
Shipping
Weight (lbs.)
Flue Dia.
90-50 50 45 39 220 2” CPVC & PVC
90-75 75 68 59 220 2” CPVC & PVC
90-100 100 90 78 220 2” CPVC & PVC
* 1 MBH = 1,000 Btuh Btuh = British ermal Units Per Hour
ese low pressure gas-red hot water boilers are design certi-
ed by CSA International for use with natural and propane
gases. e 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 Sec-
tion IV Standards for heating boilers.
++ AFUE (Annual Fuel Utilization Eciency) and Heating
Capacity is based on the D.O.E. (Department of Energy) test
procedure.
e Boilers are certied in accordance with ANSI (American
National Standards Institute) Z21.13 standards as gas-red,
direct vent, condensing, hot water boilers.
e Heating Capacity indicates the amount of heat available
aer 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. e 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. nned tube baseboard, cast iron radia-
tors, radiant oor, etc.). e dierence 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 osetting heat losses from the pip-
ing.
e 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 pub-
lished by the Hydronics Institute. e 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. e
manufacturer should be consulted before selecting a boiler for
installations having unusual piping and pickup requirements.
e boilers are factory equipped for operation at altitudes
ranging from 0-2,000 feet above sea level. For use of these boil-
ers at altitudes above 2,000 feet above sea level, the gas input
ratings (MBH) automatically reduced.
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