Why is hot waste water (shower, sink…) not reused for heating?

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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

27 Answers

Anonymous 0 Comments

There are lots of things in sink and shower water. There is hair. People shave. There is grime. If you come from a swim in the ocean lots of salt. If you come from a hike maybe some dirt. If you come from the beach there is sand. If you come from a hard day of work there could be oil, soil,… That’s of course before you even start talking about the soap, make up, shampoo etc.

There has been some experiments with re-using that water for things like toilet. But even that you need to clean and filter it.

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