Commercial HPWHs

2025 State of the Heat Pump Water Heater Market Report

NBI’s Advanced Water Heating Initiative (AWHI) has released its annual Heat Pump Water Heaters State of the Market Report. This in-depth report offers an overview of the latest in both commercial and residential heat pump water heater (HPWH) innovation in the U.S. and explores policy, technology and other market forces accelerating adoption across the industry. 

HPWH Photo Repository

Download from a collection of commercial and residential heat pump water images and diagrams.

Market Assessment for High Temperature Heat Pump Water Heaters

This fact sheet examines the current landscape of high-temperature heat pump water heater technologies and summarizes available equipment, typical use cases and building types, expected costs, and key barriers to adoption.

Housing Hilltop: A Central Heat Pump Water Heater Model for Affordable Communities

This case study looks at the the Housing Hilltop project in Tacoma, Washington, demonstrates a Central Heat Pump Water Heater (CHPWH) system to address these challenges and create a sustainable and economical hot water solution for affordable housing communities. Tacoma Housing Authority, which built and owns Housing Hilltop, sought to install CHPWHs to ensure families who have been or are at the risk of being displaced, have an equal access to healthy living spaces while reducing energy cost burden.

Central Heat Pump Water Heaters (CHPWH) in Affordable Multifamily Housing

This fact sheet outlines the details of a CHPWH install in the Housing Hilltop project in Tacoma, Washington. It describes the design rationale, system components and capacity, and project timeline. Learn some of the most important actionable takeaways and best practices to maximize efficiency.

A Brief History of Heat Pump Water Heaters (HPWHs)

This factsheet outlines the evolution of heat pump water heaters, tracing their roots back to 18th-century thermodynamic discoveries by pioneers like Willem Cullen and Lord Kelvin. With a streamlined graphic, it highlights early innovations, market struggles during the late 20th century, and eventual breakthroughs such as the ENERGY STAR certification in 2009. Steady growth continued through the 2010s, supported by national initiatives like the Advanced Water Heating Initiative (AWHI). By the 2020s, HPWHs became significantly more efficient and began gaining mainstream adoption, driven by updated regulations and improved technology.

Central Heat Pump Water Heater Market Research (2023-2025)
System Types, Market Size, and Key Regions

This report provides an overview of the currently available technologies and product types for central heat pump water heaters (CHPWHs). Analysis highlights crucial components affecting the potential CHPWH market. The first section discusses the various components of CHPWHs and the primary market delivery methods. It also delves into more than a dozen market-ready heat pump products. The second section explores the potential for CHPWH market penetration based on American multifamily housing demographics. The third and final section analyzes regional economics and building stock concerning central water heating systems. (2025)

Increasing Equitable Access to Heat Pump Water Heaters

This paper aims to share data about current methods and programs to overcome barriers to the adoption of heat pump water heaters in low-to-moderate income households and disadvantaged communities. These barriers include high initial costs, the split incentive between landlords and tenants, technical constraints, workforce challenges, and local policy barriers. The paper outlines opportunities and considerations to help ensure that those who cannot afford HPWHs or have other barriers preventing their installation are not left with the negative impacts of gas-fueled and electric resistance water heaters. The ultimate goal of these programs is to realize long-term energy savings, emissions reductions, and financial benefits for LMI people and across disadvantaged communities. (2024)

The Why, What, and How of Successful Heat Pump Water Heater Programs

Heat Pump Water Heaters (HPWHs) can deliver significant energy savings, substantial cost savings, and dramatic reductions in air pollution. However, Low- to Moderate-Income (LMI) households and members of disadvantaged communities often lack access to the benefits that HPWHs can deliver. Fortunately, some current and emerging programs have found ways to improve the equitable distribution of HPWHs.This guide discusses the need for and the benefits of HPWHs in LMI households and across disadvantaged communities. It also provides a summary of current successful and emerging federal, state, and regional HPWH programs. This guide was released in parallel with the paper “Increasing Equitable Access to Heat Pump Water Heaters” . Contact us to learn how you can get started in your community. (2024)

Mitsubishi Heat20 Hot Water Load Shift Demonstration and Simulation Analysis at Bayview Towers

Read this report that culminates several years of collaborative work between BPA, Ecotope, Mitsubishi, SkyCentrics, and Steffes to introduce the first load shift capable commercial HPWH system to the United States, featuring the HEAT2O. The Bayview Tower project retrofitted an aging electric resistance water heating system in an occupied, 100-unit, affordable housing high-rise. The new commercial heat pump water heating system at Bayview Towers marked the first U.S. installation of Mitsubishi's HEAT2O (QAHV) system – the country's first large-capacity CO2 refrigerant-based domestic water heating system. (2023)

Factsheet: The Best Solutions Come in Easy-to-Use Packages
Central heat pump water heater (CHPWH) systems can serve the domestic hot water needs of a building in one central plant.

Case Study: Project Spotlight, Low-Rise Multifamily
Two Small Planet Supply WaterDrop packaged skid systems now serve a disability and elder care facility, which was previously served by two separate gas water heating plants. To learn more about CHPWHs visit betterbricks.com/solutions/water-heating. (November 2023)

Central Heat Pump Water Heaters for Multifamily Supply Side Assessment Study

NEEA contracted with NBI in January 2021 to conduct research and outreach to better understand the current landscape of central heat pump water heater (HPWH) adoption in multifamily buildings. Research objectives included 1) Identifying all primary barriers to central HPWH adoption, 2) Increasing understanding of the value propositions (i.e., drivers) for each market actor in the central HPWH supply chain, and 3) Gathering market actor feedback to understand the most effective pathways to increased market adoption of central HPWHs. Research activities included fielding an online survey targeting specifiers and installers and conducting a series of interviews across the supply chain. (January 9, 2023)

Increasing Sustainability of Multifamily Buildings with HPWHs

Utilities and policymakers are increasingly looking to technologies such as electric heat pump water heaters (HPWHs) to help cut carbon and other greenhouse gas (GHG) emissions from buildings while providing other benefits such as grid flexibility. This new report, by NBI and ACEEE, includes a national assessment and analysis of the potential for HPWHs to improve the sustainability of existing multifamily buildings by reducing energy consumption and carbon emissions. (November 2021)

Betterbricks Central Heat Pump Water Heaters Resource Page

This website provides information about the benefits of central heat pump water heaters, as well as related resources, news and case studies.