Why is it not used again and wouldn’t it be very efficient to combine with a heat pump for reuse?
Especially since water from shower or sink isn’t usually very dirty, couldn’t it be stored for a while in an isolated tank so that e.g. a heat pump can run more efficient on it than on usually colder air or colder ground water?
In: Engineering
It’d be hard to retrofit a system like that. You’d need a decent sized holding tank to work though the water as you get the heat down.
I saw a thing recommending leaving the shower drain stopped so the hot water stayed in the tub. The heat from the water then radiates into the room instead of going down the drain.
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