Quote:
Originally Posted by ltcdfancher
Fellow Villagers,
The plumbers roughed-in the plumbing for our new home in Well Point yesterday. We opted for recirculating hot water for our tankless heater. Does anyone have experience with how these things are plumbed for new construction?
From the installation manual, there appears to be two acceptable methods: using a dedicated return loop; and, a cross-over valve. The cross-over valve uses the cold water lines as a return path while the dedicated return loop is, well, dedicated to bringing the water back to the heater.
My question is, “how is the system plumbed for new construction?” Dedicated return or a cross-over valve?
The dedicated return seems better to me for some reason.
The water lines in my current Florida home run through the attic. In the summer, the cold water is very warm and in the winter is damned cold. I’ll have warm cold water year-round with the cross-over valve, I fear. (Albeit for just a short while.)
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Recirculating water defeats the purpose of having tankless, as all the water lines become a virtual tank and your heater will run a lot more. You will save water but use a lot of electricity. Adding a timer as JRcorvett suggests is a good idea.