Boiler ratings and capacities – Kenmore 5EW1.75 User Manual
Page 4
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BOILER RATINGS AND CAPACITIES
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*MBH = !,000 BTU per hour
BTU = British Thermal Unit
**Hcalirg Capacity based on 13% C02 with a -0.02” w.c draft over fire, and a #I smoke or less. Testing was done in accordance with the D.O.E.
(Department of Energy) test procedure.
+GPH = Gallons per hour oil at 140,000 BTU per gallon
++A.F.U.E. = Annual Fuel LliMi/airon EfTicicncy based upon D.O.E. test procedure.
These low pressure oil fired hot water 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.
The Heating Capacity indicates the amount of heat available after subtracting the losses up the stack. Most of
this remaining 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 system 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 with the same number of sections are identical to each other except for their firing rate. The firing rate is
detennined by the nozzle size in the oil burner and the oil pressure at the nozzle. For example: Models 3E.65Z,
3E.75Z, and 3E1 .OOZ are the same boiler, without a tankless coil, except for the firing rate of the oil burner.
Models 4E.90T, 4E1.25T, and 4E1.50T are the same boiler, with a tankless coil, except for the firing rate of the oil
biimer.
Each boiler rating plate shows three possible model numbers for a given boiler configuration. The actual model
number is determined by the firing rate of the oil bumer. Boilers that are factory packaged include two nozzles for
These boilers operate on #2 Heating Oil.
two firing rates