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 is not that difficult (if you have any plumbing skills) to divert the drain to have the option of draining into a closed holding tank, which in turn drains back into the main drain. But it is hardly worth the effort, compared to other things like sealing out drafts.
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