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Old 11-15-11, 07:26 AM   #5
Ryland
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These type of heat exchanger's work best if they are vertical because the grey water clings to the walls of the pipe when it's flowing vertically, because of that and the requirement of having a long stretch of straight drain pipe that you can cut out and replace, I haven't heard of anyone installing one of these yet even though I saw a display with a heat exchanger like this nearly 20 years ago, but I agree, they could save a lot of energy.

As for 2" drain pipe, if it's just coming off the shower then the 2" is even over kill as I think plumbing code requires 1.5" or larger, with a smaller drain pipe you might run two fresh water lines around the outside to make it easier to bend and keep tight, of course if the drain pipe is laying horizontally then you might just solder your fresh water lines to the bottom of the drain pipe.
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