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Not much time to capture heat in a flowing drain, many small heat exchangers will be less efficient and more expensive than one large one, very hard to fit in a small space without utilising a compressor, plus additional plumbing - the captured heat pipe would have run all the way back to the water heater, losing heat all the way.



A quick google suggests 50-70% efficiency on shower heat recovery. Sounds pretty good to me.


The article says this system in Vancouver has 300% efficiency, so seems like a problem that works a lot better at scale.




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