Solar water heating system is a device that uses solar energy to heat water. A typical solar water heating system can save up to 1500 units of electricity every year, for every 100 litres per day of solar water heating capacity.

A solar water heating system consists of a flat plate solar collector, a storage tank kept at a height behind the collector, and connecting pipes.

The system is generally installed on the roof, with the collector facing the sun and connected to a continuous water supply.
Water flows through the tubes, absorbs solar heat and becomes hot.
The heated water is stored in a tank for further use.
The water stored in the tank remains hot overnight as the storage tank is insulated and heat losses are small.

Solar water heating has the following advantages :
Solar water heaters save electricity and thus money; electricity is becoming more and more expensive and its availability is becoming unrelaiable;
Solar water heaters are non-polluting.
Solar water heaters are safer than electric geysers as they are located on the roof