A Solar-Assisted Heat Pump Water Heater

Winter 2018
A version of this article appears in the Winter 2018 issue of Home Energy Magazine.
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December 10, 2018
Water heating in residential buildings has become more important as the overall efficiency of buildings has improved over the last decade, with energy efficiency code requirements for A/C, lighting, and the building envelope. Modest improvement in energy efficiency for electric-storage water heaters was implemented in 2015, with the Code of Federal Regulations (CFR). But much greater improvements remain to be made.

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