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It keeps the water heater from trying to heat all the water in the lines too. It isolates the water heater from the lines when not drawing water from it. Otherwise the water in the lines will act like a heat sink and keep the water heater far more active trying to maintain hot water with an open line into it.
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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