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Hey Ryland,
What you are saying is the sorts of things I am thinking of.
My house is over a concrete block wall/cement floor crawl-space. It is just like an unfinished basement, except for the fact that it's only 22" tall, so Height-based designs are an issue. I DO have space BELOW the bathroom, just not a lot of it.
I have considered some sort of "pre-warmer" heat exchanger. The well water in pipe runs almost right under the bathroom.
I would pre-heat the cold water from the well going to the water heater using the warm water that just left the shower. Even with warm water sitting in the storage tank in the crawl-space, some of the heat would leak back into the house, rather than just going down the drain.
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