SG Series Boilers – Installation and Service Manual
4
Boiler Water Flow Data
NOTE: The boiler should be properly sized for its heating application and maintain an adequate water
flow rate during operation. Significantly oversizing the boiler or decreasing boiler water flow
rate will cause excessive stage cycling and may result in premature failure of components.
Typical Water Flow Versus Pressure Drop Across Boiler
20°F T.D. 30°F T.D.
Model
Number
U.S. GPM P.D. FT. U.S. GPM P.D. FT.
SG135 11.4 2.8 7.6 1.2
SG180 15.1 2.8 10.1 1.2
SG225 18.9 2.8 12.6 1.2
SG270 22.7 2.8 15.1 1.2
SG315 26.5 3.2 17.7 1.3
SG360 30.3 3.2 20.2 1.4
SG400 33.6 3.3 22.4 1.4
SG450 37.8 3.8 25.2 1.6
SG495 41.6 4.0 27.7 1.8
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