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
Graywater tanks get into some messy plumbing code, not to mention the additional design considerations, maintenance and upfront cost. Maybe that can change if there’s enough of an audience for energy recapture.
The easier solution would be what someone else already posted with just a stack pipe radiator. Although, I have no idea how effective that would be.
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