The solar water heater (SWH) uses solar energy to heat water. Solar water heater (SWH) is made of solar power collector panels and a water storage tank. It supplies hot water for various house hood activities such as washing, bathing and cleaning. Apart from the domestic use solar water heater is widely in use in commercial places such as hotels and public institutions. The innovation in the field of hybrid water heater is making it as one of the prefer choice among manufacturing industries. It is generally installed at the top of the roof in order to get sufficient exposure of the sun light.
On the basis of the solar plate technology the Asia Pacific solar water heater market is segmented into plate collection type water heater, and evacuated tubes collection type water heaters. Based on the various product segments the market can be categorise in two broad categories namely active solar water heater and passive solar water heater. In active solar water heaters external water pump is needed for water circulation. Passive solar water heater doesn’t need any pumps for water circulation.