Water Heater Rescue: Know-How, Solutions, Parts graphic
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Lingo > Drain-Water Heat Exchanger

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GFX heat exchanger

 

 

Drain-water heater exchangers usually sit beneath shower or commercial drains. As the used hot water passes through them, most of the heat is drawn out and returned to the hot-water system, often by adding it to the cold-water line.

It's an interesting way to make a plumbing system much more energy-efficient. This one serves an upstairs bathroom in the House on Hummingbird Hill.

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