This HPWH demonstration examines the overall performance of HPWHs installed in a conditioned space with a number of supply and/or exhaust ducting configurations, as well as the interactions between the HPWH and the home's heating/cooling system.

Prepared by:  Pacific Northwest National Laboratory

Published:  July 2014

Using the measurement and verification (M&V) plan developed by Ecotope to assess heat pump water heaters (HPWH), the AO Smith Voltex was evaluated at the National Renewable Energy Lab. This report is the third of three preliminary assessments of three different equipment models.

Prepared by:  Bonneville Power Administration

Published:  July 12, 2011

Using the measurement and verification (M&V) plan developed by Ecotope to assess heat pump water heaters (HPWH), the Rheem Hybrid HP50 was evaluated at the National Renewable Energy Lab. This report is the second of three preliminary assessments of three different equipment models.

Prepared by:  Bonneville Power Administration

Published:  July 12, 2011

This project describes market conditions, assesses barriers such as product availability, and presents options to increase participation in PG&E's residential water heater program.

Prepared by:  Pacific Gas and Electric Company

Published:  November 15, 2012

This Building America Measure Guideline is intended for builders, contractors, homeowners, and policy-makers. While HPWHs promise to significantly reduce energy use for DHW, proper installation, selection, and maintenance of HPWHs is required to ensure high operating efficiency and reliability. This document is intended to explore the issues surrounding HPWHs to ensure that homeowners and contractors have the tools needed to appropriately and efficiently install HPWHs.

Prepared by:  National Renewable Energy Laboratory

Published:  February 2012

The objective of the research is to forecast baseline heat pump water heater sales in the Northwest -- Idaho, Montana, Oregon, and Washington. Specifically, we estimated the unit sales and installations of heat pump water heaters meeting the Tier 1 and Tier 2 Northern Climate Specification, above and below 55 gallons, in absence of utility incentive programs.

Prepared by:  Northwest Energy Efficiency Alliance

Published:  October 23, 2014

Following the survey of existing activities, the report presents conclusions through a series of recommended strategies to accelerate market uptake of HPWHs in the Northeast and Mid-Atlantic region.

Prepared by:  Northeast Energy Efficiency Partnerships

Published:  December 2012

The following HPWH performance data come from an NRDC-commissioned analysis conducted by Ecotope in June 2016. Ecotope conducted a set of simulations to estimate the energy use of Heat Pump Water Heaters (HPWH) across the United States.

Prepared by:  Ecotope

Published:  June 2016

This project seeks to answer the technical questions associated with residential heat pump water heater (HPWH) placement, design, and performance using lab testing of particular HPWH products that are likely to be available in the residential market.

Prepared by:  Bonneville Power Administration

Published:  January 25, 2010

The report describes laboratory testing and modeling exercises performed to assess potential heat pump water heater (HPWH) energy savings in the Pacific Northwest. Three integrated HPWH models, pairing two electric resistance elements with a tank-mound heat pump, were thoroughly investigated: the AO Smith Voltex, the GE GeoSpring, and the Rheem EcoSense.

Prepared by:  Bonneville Power Administration

Published:  November 11, 2011