Quote:
Originally Posted by rjm1cc
The separate return line is a good idea. The reason is that the pumps we are discussing use the cold water line to return the water to the hot water heater. Thus you lose cold water if you run the pump a lot.
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Some tankless manufactures reduce the warranty if you use a recirc pump because of the increased usage.
Units with a return line have a recirc pump built in and are designed for higher usage.