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
So the heat exchanger thats being spammed in the comments looks only mildly useful at best.
The thing ive had in mind for a while is a shower that you can switch from drain to repeat. You soap and rinse off, then flip the switch. It takes the hot water going down the drain, hits it with uv sterilizing (probably not nescessary, but still a good idea) and a heating coil, and cycles the water back up to the nozzle. Guilt free long showers sounds like a game changer to me
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