Solar water heaters use the sun’s abundant energy to heat water using either a passive or active method
Solar heating systems pre-warm household water in a solar collector and then transfer it to a traditional storage tank water heater powered by electricity, gas or oil. In the freezing winter months, the fluid in the collectors is generally an antifreeze liquid, which is then run through a heat exchanger to heat the household water.
Solar water heaters can supply up to 50 percent of the energy needed to heat water for an average household. Since the sun’s energy is a free resource, solar water heaters can significantly reduce a household’s water heating costs – savings that will eventually offset the purchase and installation costs of a solar water heating system.