I'd like to see a ball-valve located in the wall next to the shower that in the winter, you'd switch and it would divert the draining hot-water through a series of pipes in your floor-tile to extract as much usable heat from the water as possible before going to the drain. It would have to be screened before going into the tile system, to discourage clogs.

Similar systems could be enacted for the kitchen, etc.

I think lots of energy is spent heating water that is just dumped down the drain once it's dirty.

What do you think of this idea or comment?
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I agree

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I disagree