Wiktionary
n. An appliance for heating water above its ambient temperature, generally for domestic use.
WordNet
n. a heater and storage tank to supply heated water [syn: hot-water heater, hot-water tank]
Usage examples of "water heater".
The furnace and hot-water heater were in a closet upstairs, and the room was utterly vacant.
Some bird built its nest up there, and you've got carbon monoxide from the water heater seeping into your house.
I don't use a water heater, and consequently I am more than used to cold showers.
He had just taken one, but he was after all in the habit of shaving in the shower, so maybe he would just go back upstairs and drain Anne's water heater.
He hadn't realized until now how much noise a refrigerator made, or a water heater.
The water heater is wired to the generator, so there's plenty of hot water.
I got the shotgun out of my trunk and loaded it, sticking it in the shadow of the water heater.
The door opened, and they stepped into a high-ceilinged room in which thrummed an enormous water heater.
The planned defense was that combustion resulted not from the water heater but from a buildup of high quantities of methane emitted by a barn full of cows.