Solar thermal, or solar hot water, as it is often referred to, works by converting the sun’s energy directly into heat. This heat is then used within your home, primarily to heat your domestic hot water, but can also be used for space heating or pool heating.
How it works: The light from the sun hits a solar thermal collector, which is typically installed on the roof of a home. Within the solar thermal collector is a glycol solution. When light hits the collector, the glycol is heated. The heated glycol is pumped to a hot water tank and heats the heating element located at the bottom of the water tank, this indirectly heats the potable water above the heating element up to 140 degrees.