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Old 03-04-10, 12:33 PM   #13
Xringer
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I wonder if one of those Ebay flat plate exchanger would work for a shower drain (warming the cold input side).

50 Plate Outdoor Wood Furnace Heat Exchanger 1-1/4"Port - eBay (item 250586847892 end time Mar-26-10 22:34:19 PDT)

Might be a little tight in there..

Have to build in a back-flush valve to clean it out..
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