Quote:
Originally Posted by Mike Shebel
You are dealing with a small quantity of water from the water heater to your shower faucet. In 50 feet of three-quarter Inch CPVC pipe there is only one and 1/3 gallons of water.
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Correct, I've measured it takes about a half gallon here.
There is a temperature drop of 5-10 degrees so the efficiency recirculating would not be very good.