Solar water heating is a technology that uses sunlight to heat water for residential or commercial use. It typically consists of solar collectors, which capture sunlight, and a storage tank, where the heated water is stored. This system can significantly reduce energy costs by using renewable energy from the sun instead of relying solely on traditional energy sources. There are two main types of solar water heating systems: active and passive. Active systems use pumps and controls to circulate water, while passive systems rely on natural convection. Both types can provide hot water for various applications, including domestic hot water, swimming pools, and space heating.