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SECTION F: DOMESTIC HOT WATER PIPING
When designing the water piping system for domestic water applications, water hardness should be considered. Table F-1
indicates the suggested flow rates for soft, medium and hard water. Hardness is specified as grains per gallon.
TABLE F-1
DOMESTIC WATER HEATER
FLOW RATE REQUIREMENTS
* Must use optional Cupronickel tubes.
T = Temperature Rise, Degree F P = Pressure Drop Ft. thru heat exchanger
GPM = Gallons/Minute, Flow Rate SHL = System Head Loss, Ft.
MPS = Minimum Pipe Size, NPT
System head loss is based on the heater and tank placed no more than 5 feet apart and 25 feet equivalent length of pipe
and fittings.
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