Quote:
Originally Posted by Elwin
...Then there is this guy who built a new shower floor with a heat exchanger under it...
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Elwin,
How about this:
This would go directly on your shower floor, preferably under an attractive wooden grate, upon which you would be standing.
Assuming you have access to the cold water flow before it gets to the temperature mixing valve, prior to the shower head, divert the water, prior to the mixing valve, and run it through the copper coil at "A", then take the water flow from point "B" and connect that back to your cold water that is flowing into the mixing valve.
The warm shower water would fall upon the copper coil, pre-warming the incoming cold water component of your shower water. You would be able to reduce the hot water level until an ideal shower temperature was achieved, thereby saving energy & money.
NOTE: I have a demand water heater, and I have it adjusted so that it only heats water up to shower water temperature, for me, that would be 104F. Most people use excessively-hot water, and they then mix enough cold water with it, that it is at the right temperature. This copper coil idea would be perfect for those people.
Best,
-AC_Hacker