This specification provides guidance to manufacturers who are interested in developing products that not only meet ENERGY STAR criteria but are able to provide high levels of consumer satisfaction and energy performance in cooler, northern climates. The specification was updated September 9, 2014 with Appendices F and G. A media backgrounder document, product assessment worksheet and product list is also available.

Prepared by:  Northwest Energy Efficiency Alliance

Published:  July 18, 2013

This specification provides guidance to manufacturers and other market actors who are interested in developing products that not only meet ENERGY STAR criteria but are able to provide high levels of consumer satisfaction and energy performance in a range of climates.

Prepared by:  Northwest Energy Efficiency Alliance

Published:  May 10, 2016

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

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

Properly installed heat pump water heaters save homeowners hundreds of dollars in water heating costs each year. By following best installation practices and providing homeowner education, you’ll ensure satisfied customers.

Prepared by:  Northwest Energy Efficiency Alliance

Published:  unknown

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 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

Supporting & Related Material documentation pertaining to the Energy Conservation Standards for Residential Water Heaters, Direct Heating Equipment, and Pool Heaters Final Rule.

Prepared by:  US DOE Office of Energy Efficiency and Renewable Energy

Published:  Jun 25, 2012

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