The CO2 refrigerant, split-system heat pump water heater was tested in both lab tests and at four field sites representing the three heating zones in the Pacific Northwest. This report focuses on the field tests and the data and experience collected over almost two years of monitoring.

Prepared by:  Washington State University Energy Program

Published:  December 31, 2015

Prepared by:  Washington State University Energy Program

Date:  March 2014

This report describes results of a scoping-level analysis of significantly higher efficiency electric heat pump water heaters (HPWH). The specific goal of the work was to identify electric HPWH design options that have the potential to achieve or exceed 30% source energy savings compared to a gas tankless water heater (GTWH) representative of the type represented in version 0.9.5.2 beta of the BEopt™ software developed by the National Renewable Energy Laboratory.

Published:  September 2011

The Building America Solution Center heat pump water heater guide provides installation guidance, training resources, standards, and case studies.

Author: U.S. Department of Energy

Publication Date: June 2015

This DOE web page highlights a range of studies into heat pump water heater performance conducted by Oak Ridge National Lab and various university and industry partners.

Author: U.S. Department of Energy

This consumer-facing website offers information, reviews and features of different types of water heaters.

Author: Consumer Affairs

The website of the Northwest Energy Efficiency Alliance offers a range of resources designed for consumers, including tools to find HPWH retailers, installers and promotions as well as general consumer guidance on HPWH benefits.

Author: Northwest Energy Efficiency Alliance (NEEA)

Prepared by:  Pacific Northwest National Laboratory

Date:  February 22, 2015

Event:  ACEEE Hot Water Forum 2015

This project evaluates and documents the demand response (DR) performance of an HPWH as compared to an electric resistance water heaters (ERWH) for two primary types of DR events: peak curtailments and balancing reserves.

Prepared by:  Pacific Northwest National Laboratory

Published:  July 2013

Oak Ridge National Laboratory partnered with the Tennessee Valley Authority to investigate the load management capability by reducing the peak period energy consumption of heat pump water heaters that meet or exceed the forthcoming water heater standard. ACEEE Summer Study on Energy Efficiency in Buildings document.

Prepared by:  Oak Ridge National Laboratory and Tennessee Valley Authority

Published:  2014