Quote:
Originally Posted by marx290
Has anyone in the Ecorenovator world seen a residential HPWH that recovers energy from a home's waste water stream? It always seemed to me, that the time a water heater "calls for heat", is likely when the warmest water is draining from the home.
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There are heat recovery systems for the waste pipe, basically big bits of copper.
The issue besides cost recovery, is you need headroom, a good 5-10feet of vertical drop from the drain to install the device.
google is your friend