Hot Water: Why Plumbing Technologies and System Designs Matter

March/April 2015
This online-only article is a supplement to the March/April 2015 print edition of Home Energy Magazine.
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January 31, 2015
The average home in the United States makes at least 2,000 annual demands for hot water. And that’s very conservative. A more-likely demand value exceeds 4,000. Couple those demands with an average wait time for hot water at the master bath showerhead in single-family homes that is, according to an informal web poll performed by the National Resources Defense Council, more than 70 seconds. That’s a lot of water down the drain waiting for hot water! Even with a highly efficient showerhead, that’s 2.3 gallons—for just one hot-water demand event!

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