Not sure how
Not sure how they plumb their version of recirculated hot water but I'm sure it's not the way I would do it. I would use a flow detection switch in the hot water outlet line that would energize the circulator. When the hot water is turned on the circulator will come on and charge the loop with hot water. When hot water returns to the water heater an aquastat will sense the hot water has charged the entire loop and turn the circulator off. The circulator will charge the loop faster than purging all the cold water in a conventional system. The water heater doen't run unless needed saving on gas usage. Water waste is minimal. I don't see the Villlages builders doing it this way due to the price of all the components. I would get in the car and get on site to see what's going on. Good luck with your build.
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