A tankless water heater is an energy-efficient water heating system that heats water only when it is needed. These space-saving, long-lasting water heaters provide an endless stream of clean, hot water for all your appliances simultaneously without temperature fluctuations. Typical household uses of hot water are for cooking, cleaning, bathing, and space heating. In industry, both hot water and water heated to steam have many uses.
Appliances for providing a more-or-less constant supply of hot water are variously known as water heaters, hot water heaters, hot water tanks, boilers, heat exchangers depending on whether they are heating potable or non-potable water, in domestic or industrial use. Advantages of using a tankless water heater are long term energy savings, unlimited hot water, space-saving, and safety.