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The "off sensor" automatically shuts off the pump and closes the zone valve when hot water arrives at the system.
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I don't think I could justify $339 for this. It only heats water in the line and then allows the hot water heater to take over with it's already heated water (or water "being" heated for a tankless). We try not to waste water but sometimes we do by allowing the cold water to go down the tubes but at $339, it definitely puts this thing at the bottom of the "to do" list.
I would build a grey water system before I bought this to at least use the water lost waiting on the hot stuff. Only my opinion. At 2-3 gallons a pop, using the water for flushing toilets would conserve more water than this would. I don't have any numbers on that so don't quote me. lol