Summer Indoor Heat Pump Water Heater Evaluation in a Hot-Dry Climate

Stacey Rothgeb, Marc Hoeschele, Matthew Seitzler, Stacey Rothgeb (NREL Technical Monitor)

Research output: NRELSubcontract Report


Heat pump water heaters offer a significant opportunity to improve water heating performance for the over 40% of U.S. households that heat domestic hot water using electric resistance storage water heaters. Numerous field studies have also been completed documenting performance in a variety of climates and applications. More recent evaluation efforts have focused attention on the performance of May through September 2014, with ongoing winter monitoring being sponsored by California utility partners. Summer results show favorable system performance with extrapolated annual water heating savings of 1,466 to 2,300 kWh per year, based on the observed hot water loads. Additional summer space cooling benefits savings of 121 to 135 kWh per year were projected, further increasing the water energy savings.
Original languageAmerican English
Number of pages44
StatePublished - 2017

Bibliographical note

Work performed by Alliance for Residential Building Innovation (ARBI), Davis, California

NREL Publication Number

  • NREL/SR-5500-64082

Other Report Number

  • DOE/GO-102017-4648


  • ARBI
  • Building America
  • detailed monitoring
  • ducting kits
  • heat pump water heater space conditioning impacts
  • heat pump water heaters
  • Hot-Dry climate
  • residential
  • Residential Buildings
  • water heating


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