Solar water heating
Solar water heating (SWH) is heating water by sunlight, using a solar thermal collector. A variety of configurations are available at varying cost to provide solutions in different climates and latitudes. Records of solar collectors in the United States date to before 1900, involving a black-painted tank mounted on a roof. Simple designs include a simple glass-topped insulated box with a flat solar absorber made of dark-colored sheet metal, attached to Evacuated tubeETSCs can be more useful than other solar collectors during winter season. In higher latitudes, design requirements for cold weather add to system complexity and cost.
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