Are There Regulations for Using Solar Thermal in Heating?

Solar Thermal Building Codes

In the United States, for instance, the International Residential Code (IRC) requires that solar thermal systems be sized to meet a minimum of 50% of the building’s heat load. The IRC also specifies that solar thermal systems must be designed and installed by a certified professional. In Europe, the EN 12976 standard specifies the requirements for solar thermal systems, including system design, installation, and testing.

Hydronic Radiant Floor Heating

Solar thermal systems can be used in conjunction with hydronic radiant floor heating systems, which circulate heated water through pipes embedded in the floor to provide a comfortable and efficient heat source. In a typical system, the solar thermal collector heats a glycol solution, which is then pumped through a heat exchanger to warm the water for the hydronic system. This configuration can be particularly effective in well-insulated buildings with a moderate climate, where the solar thermal system can provide up to 80% of the building’s heat load.

Tax Incentives and Rebates

In the United States, the Solar Investment Tax Credit (ITC) provides a tax credit of up to 26% of the cost of a solar thermal system, including installation costs. Additionally, many states and utilities offer rebates and incentives for solar thermal systems, which can help offset the upfront cost of the system. For example, the California Solar Initiative offers rebates of up to $3,500 for solar thermal systems installed in California.