How does a circulation pump for a hot water heater keep the water at the tap hot ?
The water in the pipes lose heat quickly so you need to run the hot water awhile until the cold water is drained from the pipe. The pump circulates water through the pipes so it is always hot. It draws the water from the heater and discharges the colder water at the bottom of the tank to be re-heated. The hot water pipe loses about 30 BTUs per hour to the attic, basement, or wall.
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