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To: DuncanWaring

I’ve worked that idea in head many mornings standing in the shower watching the warm water go down the drain. My idea centers around a manifold to smaller drain pipes in parallel to increase the surface area. But I keep getting hung up on what a god-awful clog it would create in time. Next thought was to come up with a finned drain pipe similar to old school baseboard hot water heat. Then again if I switch to cold showers I won’t be thinking about it.


13 posted on 04/05/2013 11:02:38 AM PDT by WinMod70
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To: WinMod70
I had a similar idea years ago -- but the design I came up with was ridiculously (in retrospect) overcomplicated. More recently, I discovered that the devices are now available for purchase. The design is somewhat like what you envisioned -- except that a normal drain pipe is wrapped with copper tubing for the intake water. That avoids the clogging problem.


25 posted on 04/05/2013 11:50:03 AM PDT by USFRIENDINVICTORIA
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To: WinMod70

The way the one I referred to was described was that there was a central pipe (copper) 3” or 4” in diameter, through which the waste water flowed - spliced in to the existing drain line from the bathtub.

It, then, had another copper pipe - normal supply pipe, 1/2” or so, wound tightly on a mandrel so it was slightly deformed to increase the surface-area contact. The cold water flowed through that one on its way to the heater, and warmed significantly.

Worked well for showers, when the supply came in as the same time as the outflow; not so good for baths.


26 posted on 04/05/2013 11:53:37 AM PDT by DuncanWaring (The Lord uses the good ones; the bad ones use the Lord.)
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