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I have poor solar access, so a DIY solar water preheater wouldn't do me much good. (Although they ARE great return on investment AND very practical overall.)
I was just thinking of a very basic heat exchanger. Something easy and cheap - one pipe inside another, something like that.
Even if waste water was temporarily held inside the house, I would get some heat just from the water in the tank radiating it's heat out.
I know it wouldn't be a big thing, but I was just thinking that if I can get some of the heat back, why not?.
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