Solar water heaters are a type of renewable energy technology that uses the sun's energy to heat water. The technology behind solar water heaters has been around for many years and has evolved over time to become more efficient and cost-effective.

The most common types of solar water heaters are flat plate collectors and evacuated tube collectors. Flat plate collectors are the simplest and most common type of solar water heater. They consist of a flat, rectangular box with a transparent cover and a black absorber plate inside. The absorber plate absorbs sunlight and transfers the heat to a fluid flowing through tubes attached to the plate. The heated fluid is then used to heat water in a storage tank.

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Evacuated tube collectors are a more advanced type of solar water heater that are more efficient than flat plate collectors. They consist of a series of glass tubes, each containing an absorber plate and a fluid that is heated by the sun. The tubes are evacuated to reduce heat loss and increase efficiency.

Solar water heaters can be either passive or active. Passive systems rely on natural convection to circulate the heated water, while active systems use pumps to circulate the water. Active systems are generally more efficient than passive systems, but they are also more complex and expensive.

In addition to the collectors and circulation system, solar water heaters also require a storage tank to hold the heated water. The size of the storage tank depends on the size of the solar water heater system and the amount of hot water needed.