Electrify home heating: How contractors can retrofit gas boilers with hydronic heat pumps
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As the shift toward cleaner, more energy-efficient home heating systems accelerates across the U.S., residential contractors are uniquely positioned to help homeowners make the transition. While much of the focus has been on air-to-air heat pump installations, there’s a significant and often-overlooked opportunity to electrify homes that rely on gas-powered boilers and hot water distribution systems. The answer? Hydronic heat pumps.
Why retrofit with hydronic heat pumps?
Nearly five million single-family homes in the U.S. rely on boiler-based heating systems, especially in older homes throughout the Northeast, Midwest, and Pacific Northwest. These systems use hot water distributed through radiators, baseboards, or in-floor piping. Many of these homes are located in states pushing hardest for electrification and carbon reduction.
Unlike traditional boilers, which provide only hydronic heating and domestic hot water production, retrofitting with a hydronic heat pump also delivers cooling in the summer, resulting in an all-in-one solution for comfort cooling, heating, and hot water.
Contractors can now offer these homeowners a compelling path to decarbonization while preserving the home’s hydronic distribution infrastructure. By retrofitting or replacing an existing gas boiler with an air-to-water heat pump, it’s possible to reduce fossil fuel use while maintaining — or even improving — comfort and year-round performance.
In colder climates, homeowners may opt to retain their gas boiler as a backup heat source. This dual-fuel, or hybrid, configuration ensures peace of mind during the harshest winter days while the heat pump operates efficiently the rest of the year.
How it works: A quick primer
Hydronic heat pumps work by pulling thermal energy from outdoor air and transferring it into a water-based system, even in cold weather. An outdoor unit extracts heat, then transfers it through a heat exchanger into a circulating water loop, which delivers hot water to the home’s existing distribution network.
In cooling mode, the process reverses: the system absorbs heat from indoors and releases it outdoors. That means one system can now provide heating, cooling, and DHW — an all-in-one solution for modern comfort.
Comfort and decarbonization benefits
Compared to gas boilers, hydronic heat pumps offer several advantages:
- Reduced emissions — Fully electric operation eliminates direct carbon emissions and supports regional decarbonization efforts.
- Efficiency — By moving heat instead of generating it, hydronic heat pumps achieve much higher energy efficiency than traditional gas-boiler heating.
- Year-round comfort — These systems provide heating and cooling in a single HVACR system footprint.
- Lower water temperature operation — Most heat pumps generate up to 140 °F water (versus 180 °F for a gas boiler), which enhances their efficiency.
In colder climates, contractors often recommend a backup heating system, such as the home’s existing gas boiler. These dual-fuel systems help to ensure reliable comfort and energy savings year-round.
Incentives and economics
Hydronic heat pumps typically have higher upfront costs than gas boilers. However, they offer significant long-term energy savings, particularly in homes with integrated domestic hot water systems. Contractors should help homeowners understand the total cost of ownership, not just the first cost.
Several incentive programs can help offset installation costs:
- State-level programs, like Mass Save and Efficiency Maine, provide rebates specifically for heat pump boiler replacements.
- The New England Heat Pump Accelerator (NEHPA) focuses on retrofitting homes with radiator-based systems, providing additional support for compatible technologies.
- Local utility rebates and manufacturer incentives can further reduce upfront costs.
Selecting best-fit technologies
To ensure reliable operation and performance, contractors need to be informed of Copeland’s advanced heat pump, compression, and system technologies designed specifically for hydronic retrofits.
Our integrated hydronic heat pump portfolio is engineered for peak performance, reliability and efficiency — helping manufacturers and contractors deliver solutions that meet both homeowner expectations and efficiency standards.
Key technologies include:
- Copeland YHW variable-speed scroll compressor with Enhanced Vapor Injection (EVI):
- Delivers hot water up to 140 °F even in cold climates
- Optimized for year-round, part-load operation
- Ensures comfort in both summer cooling and winter heating conditions
- Low-GWP refrigerant compatibility:
- Supports sustainable operation with refrigerants like R-454B
- Next-gen platforms are being developed for ultra-low GWP (<150), such as R-454C, capable of delivering up to 160 °F water
- Integrated system components:
- Compression, drives, system, and refrigerant flow controls are purposefully integrated for optimal reliability, design simplicity, and performance.
These technologies are backed by Copeland’s rigorous testing, global engineering support, and partnerships with leading manufacturers of hydronic and boiler systems.
Explore new retrofit opportunities with confidence
Hydronic heat pumps represent a powerful retrofit opportunity for contractors working in older homes with boiler-based heating systems. These systems help homeowners by:
- Eliminating direct fossil fuel emissions
- Providing both heating and cooling in one package
- Delivering efficient, comfortable performance with existing hydronic distribution networks
- Implement future-ready technology with the assistance of available incentives
By leveraging Copeland technologies, contractors benefit from our legendary scroll compression reliability, deep application expertise and dependable componentry that help take the risk out of retrofits and simplify installation. Now, you can help customers transition to a more efficient, electric future — one hydronic system at a time.
Learn more about Copeland’s role in the hydronic heat pump evolution at copeland.com.
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