Great thread.
I've been thinking of use our dryer exhaust for preheating our hot water, something we need whether winter or summer.
There are 'condensing' or 'ventless' dryers that use either recirculated room air or tap water in a heat exchanger to dry clothes. Unfortunately the water is typically wasted. My thought is to preheat our 50 deg. F well water in a heat exchanger connected to the dryer. The water/heat would then be stored in a separate tank that feeds into our water heater. I could add an air-to-water heat exchanger to our existing electric dryer exhaust and then somehow plumb/pump the water to the preheat tank.
Thought I'd shared to get a sanity check.
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