08/06/2026
SOLAR WATER HEATER
Solar water heating system is a device that helps in heating water by using the energy from the SUN. This energy is totally free. Solar energy (sun rays) is used for heating water. Water is easily heated to a temperature of 60°-100° C.
Solar water heater is a device that uses solar heat energy to produce hot water.
A typical solar water heater consists of a solar collector mounted on the roof of a building and connected to a water-storage tank.
Depending on the system, unheated water either can be circulated from the tank through the collector to be heated directly or can be heated by a high-capacity heat-exchange fluid that was warmed in the collector and transfers its heat through tubes in the water in the tank.
The heat transfer from the solar collector to the unheated water can be facilitated passively without mechanical means, “active” solar hot water systems use electricity to circulate the heat-exchange fluid and to operate mechanical pumps and controllers.
Although the practice of using the sun for heating water for domestic use can be traced back to several ancient cultures, it was not until 1891 that the first patented solar hot water system was sold commercially.
Invented by a renowned renewable energy mentor Clarence Kemp in Baltimore, Maryland, the system was called the “Climax” and was popular in California and other warm American states.
Given the comparatively high cost and inconvenience of using conventional fuels to heat water, many households were eager to invest in these solar hot water heaters.
However, the Climax system was limited in that the heating element doubled as the storage tank, thus restricting the amount of hot water available.
In 1909 William J. Bailey another renowned renewable energy expert developed a patent system that separated the water-storage tank from the solar heating element, forming the basis of the design of solar hot water heaters used today.
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