Hot Water Storage Tanks

A hot water storage tank (also hot water tank, thermal storage tank, hot water thermal storage unit, heat storage tank, hot water cylinder) is a water tank that is used for storing hot water for space heating or domestic use. A heavily insulated tank can retain heat for days.[1] Hot water tanks may have a built-in gas or oil burner system, or electric immersion heaters, or may use an external heat exchanger to heat water from another energy source such as district heating, wood-burning stove, or a district heating system.