this post was submitted on 22 Nov 2023
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There are electric water heaters that can take the preheated water from the general system and give it the last boost to exactly the temperature you desire. Ideally those would be installed relatively close to wherever you need the water. They are less efficient, but on the plus side, they only heat whenever and exactly how much you need
I've contemplated a heat exchanger on the tub drain line to capture the heat from my shower to preheat water into the tank.
A small, non-functional gas water heater, located in a hot, summer attic, and with a small fan blowing air down the exhaust stack, makes an excellent pre-heater.
Stick a small window air conditioner in there, and it becomes a redneck heat pump water heater.