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Determine the maximum number of devices you want to run and their total flow rate. Then, add up their flow rates (gallons per minute).
Determine required temperature rise.
Make is simple and use a sizing calculator that will do the work for you.
Sizing Example: An average shower will be between 104–106° and uses 2.6 gallons of water.
AVERAGE FLOW GPM
|Shower||2.5 – 3.0 GPM||104°F|
|Washing Machine||2.0 GPM||120°F|
|Kitchen Sink||1.5 GPM||110°F|