Solar hot water refers to water heated by solar energy. Solar heating systems are generally composed of solar thermal collectors, a fluid system to move the heat from the collector to its point of usage, and a reservoir or tank for heat storage and subsequent use. The systems may be used to heat domestic hot water, swimming pool water, or for space heating. The heat can also be used for industrial applications or as an energy input for other uses such as cooling equipment. In many climates, a solar heating system can provide a very high percentage (50% to 75%) of domestic hot water energy.
Most homes today use either natural gas or electricity to heat water for home use. The prices of these sources of energy vary by location and time of year, but we expect that everyone will agree that that such energy is not cheap and will be getting more expensive in the future. Moreover, most of such energy production has a high carbon footprint and contributes to global warming. In contrast, solar energy is plentiful (in most locations in the US), environmentally clean, and free of any future out-of-pocket cost (after the up-front capital cost of an installation).
The solar hot water system is designed to operate automatically, taking advantage of solar energy when it is available.
The system will turn on when solar energy can be added to the water heater. The solar controller will activate the circulation module which will push water up to the solar collector(s) and begin circulation. When solar energy becomes unavailable or when heated water is not required, the system will turn off and all water will gravity drain into the drainback tank so the water cannot freeze on your roof or in your attic.
How does it Solar Hot Water work?