Solar Hot Water in Cambridge

Solar hot water systems use the energy of the sun to heat your home's water supply. This technology is entirely renewable, and installing it can benefit both the environment and your wallet!

An overview of solar hot water

Generates warm water for your home using the sun's thermal energy


Can supplement your regular water heater


Has the potential to eliminate your entire water heating bill


Works well in cold climates

Interested in getting a solar hot water system for your home?

Connect with local, vetted contractors to understand your options.

Incentives for solar hot water

Cambridge residents installing a solar hot water system qualify for the Alternative Energy Certificate (AEC) program. With this program, you can receive certificates based on the energy production of your solar hot water system. You can sell these certificates to utilities for extra cash. The revenue earned from these certificates will help you to further decrease your overall investment for solar hot water. Learn more about AECs.

Mass Save HEAT Loan

If you're installing solar hot water, you may be eligible for a 0% interest HEAT Loan from Mass Save to finance the project. You can borrow up to $25,000 for home energy efficiency upgrades. Find out more about Mass Save's HEAT Loan program. 


The State of Massachusetts provides a state tax credit of up to $1,000 for solar hot water installations. In addition, the Massachusetts Clean Energy Center (Mass CEC) provides rebates of up to $4,500 to help lower your upfront cost of installing a solar hot water system. Learn more about this state tax credit, or read about the Mass CEC's solar hot water rebate program.

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Do you live in a multifamily building?

Many Cantabrigians live in shared buildings. If you live in a multifamily air source, solar hot water systems are a good solution to heat your water supply. That said, there are extra considerations to take when installing this technology on a shared property. Our no-cost Retrofit Advisor can help your apartment or condo building learn more about suitable clean heating and cooling options and help you find ways to finance your project.


or call 617-301-6207 to get started.

Does solar thermal work in the winter?

Just like solar electric panels, your solar thermal panels will work during the wintertime. They will generate less hot water than in sunnier months, so you may have to use your backup water heater more often during cold weather. Any snow that is accumulated on the panels will typically slide off on its own when the sun comes back out. Solar thermal systems installed in Cambridge will also have freeze protection.

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Solar hot water in action
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Cambridge homeowner installs solar hot water; "Easy way to reduce our carbon footprint by using the heat of the sun!"

Mina of Cambridge installed a few solar collectors to heat her multifamily residence. The system provides hot water for two families in the building, and covers roughly 50-74% of their total hot water needs. They decided to install solar thermal after learning that their roof wasn't good for solar PV because of limited roof space- with this technology, she's still benefiting from solar energy and reducing her carbon footprint!

Read eight unique Cambridge Case Studies

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