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Heat from the Shower Drain
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23
comments (23 topical, 0 editorial)
Re: Heat from the Shower Drain
(
3.00 / 0
) (
#13
)
by fcfcfc on Fri Dec 14th, 2007 at 12:13:09 PM MST
(
User Info
)
Hi: I have thought about this a million times but have never done it. My guess is that today if you want to make it as cost effective as possible (sky high price of copper), off the top of my head I would replace a section of the down (vert) iron or PVC main drain pipe with a stainless steel 4" thin wall (cheaper than copper) and then weld a larger stainless steel pipe, say 8" (maybe sched 10 or 20) with a top and bottom ring to create a small (say 5 gallons) tank around the 4" down pipe that the cold DHW in feeds into. This would accomplish several things: Cheaper than copper, never corrode, it would give you a hybrid solution taking advantage of heating while you load and to a certain degree store heat and load later. I know when I visit my plumbing wholesaler these days, stainless fittings are allot cheaper than copper which is why the market has shifted as long as you don't have to solider it. Weld this up once and you are done forever, no matter how you clean your drains. The heat transfer cof. of stainless really won't hurt that much in this sit..
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Parent
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Re: Heat from the Shower Drain
(
3.00 / 0
) (
#22
)
by BigBreaker on Tue Dec 18th, 2007 at 10:31:56 AM MST
(
User Info
)
I agree that copper is overkill. It is most critical when the difference in temperature is low. Pre-heating your hot water with the warm gray shower runoff is a high "delta T" application. No reason to use copper.
[
Parent
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Heat from the Shower Drain
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23
comments (23 topical, 0 editorial)
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