Section F - Raypak 122-322 Operating And Installation Instructions

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.
T = Temperature Rise, Degree F
GPM = Gallons/Minute, Flow Rate
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.
TABLE F-1
DOMESTIC WATER HEATER
FLOW RATE REQUIREMENTS
P = Pressure Drop Ft. thru heat exchanger
SHL = System Head Loss, Ft.
16
* Must use optional Cupronickel tubes.