A solar water heater is a device that uses solar energy to heat water for domestic or commercial use. It typically consists of solar collectors, usually placed on rooftops, which absorb sunlight and convert it into heat. This heat is then transferred to water stored in a tank, providing hot water without relying on electricity or fossil fuels. Solar water heaters are energy-efficient, environmentally friendly, and help reduce electricity bills by using renewable solar power. They are commonly used for bathing, washing, and heating needs.