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
The magnitudes in what you are trying to get out of that waste wouldnt be quite enough and since water is such a great transient for hot/cold most of it is already lost in someway, something more like “what if the water heater could give off some ambient heat to warm up the heating”, well thats because the energy required to warm, say a room, by that would increase to the point of complete inefficiency, and you’d be better off putting that energy directly into an actual cooling/heating mechanism.
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