[[Image:solar water heater.jpg|thumb|right|200px|A Solar water heater is installed on several rooftops in South Africa. Photo: [httphttps://wwwafricacheck.chinapost.com.tworg/internationalspot-check/2011/06/27/307611/Solaranc-solar-water.htm -heater-promise/ AFP]]]
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A solar water heater is any system that uses the thermal energy of the sun to heat water. They are usually aimed at heating water to a temperature hot enough for washing clothes, washing dishes, and personal hygiene, but not hot enough to cook with straight away. However, as long as it is clean, the hot water can also be used in cooking to save time and fuel.