Heat pump water heaters (HPWHs) run on electricity and move heat from ambient air to water in a tank. Depending on ambient conditions, usage patterns, control modes and equipment specs, HPWHs can reduce energy for water heating by about 50-75% compared to electric resistance water heaters. Split (compressor separate from tank) and packaged (compressor combined with tank) units are available.

Note that A. O. Smith and Rheem distribute their products under a number of different brand names not broken out separately in these lists; see expanded list view for more details. 

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