Hot water recirculator
Posted by Lyle on March 05, 19101 at 16:57:13:
I want to install a hot water recirculating pump to eliminate the wait for hot water in the kitchen. All the vendors show a 1/2 inch return line connecting to the heater's drain valve. Why do I need anything larger than a 1/4 inch return line, and why can't it connect to the cold water supply to the heater. I need to circulate only enough water to make up for the heat loss from the supply line, and it should be wrapped with insulation. They also show a check valve, which shouldn't be needed if the pump is running and/or the return line is small.

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