A solar water heater is a device that generates hot water using solar heat energy. A solar collector that is attached to a water storage tank and positioned on the top of a building makes up a standard solar water heater. Depending on the system, unheated water can either be heated directly by being circulated from the tank through the collector or by a high-capacity heat-exchange fluid that has been warmed in the collector and transmits its heat through tubes in the water in the tank. “Active” solar hot water systems employ energy to circulate the heat-exchange fluid and power mechanical pumps and controllers, whereas passive solar hot water systems transmit heat from the solar collector to the unheated water without the use of mechanical means.
Through the use of a collector mounted on the roof, the solar water heater gathers light and turns it into heat.
A circulating pump is then used to transfer the heat to a water tank. The thermal regulator only initiates this exchange when the collector is hotter than the tank's water. This not only stops the circulating pumps from wasting energy, but also keeps them from overheating.
The water is preheated and a backup system takes over to heat it to the appropriate temperature when there is not enough sunlight. As a result, this system can be used all year long at a consistent temperature.
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