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Drain Water Heat Recovery

By   /  October 14, 2012  /  No Comments

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Drain water heat recovery

Kudos to Alex Wilson for his recent GreenSpec article on drain water heat recovery. This is one of those energy-saving ideas been around for a while, but is a bit of a sleeper — it hasn’t gotten as much attention as it deserves. I’m a fan and have been including this topic for the last couple of years in the Zero Net Energy Homes classes I teach for utility customers in California. Drain water heat recovery is appealing for its simplicity: as warm water goes down the drain (from showers, etc.), the heat is recaptured via a copper pipe spiral-wrapped around the drain line. The photo here shows an installation by Larry Weingarten, a water heating expert in California.

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About the author

green building consultant; owner/founder, Design AVEnues LLC

Ann V. Edminster, M. Arch., LEED AP, is a leading green building consultant, speaker, teacher, and author. Her recent work and award-winning book, Energy Free: Homes for a Small Planet, focus on net-zero energy homes. Ann has taught for groups including AIA, USGBC, Pacific Gas & Electric, and Southern California Edison. Ann’s consulting clients include major builders, software companies, design firms, developers, public agencies, utilities, investors, and homeowners. She has held key roles on numerous award-winning residential projects of all types.

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