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hot water circulation system

last month

I'm wondering if the easy aftermarket recirculating system for instant hot water in a ranch home is any good. To me, the cold water has nowhere to go but slowly seep back to the hot water tank once the sensor opens between the hot and cold at the faucet. Also, to me, it seems a third pipe system would be much better and more efficient as it wouldn't be competing with house pressure and recirculating pump pressure.

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