hot water heater

== English == === Alternative forms === hot-water heater, hotwater heater === Noun === hot water heater (plural hot water heaters) An apparatus, usually fuel-burning, electric or solar-powered, in which water is heated to be used directly as domestic hot water or process hot water (but not for supplying space heating, calorifiers etc, for which a boiler or furnace is used). ==== Usage notes ==== Some people object to the use of the term hot water heater and prefer simply water heater, since water that is already hot does not require heating. ==== Translations ==== === See also === boiler geyser