noun
a heater and storage tank to supply heated water
• Syn: ↑hot-water heater, ↑hot-water tank
• Hypernyms: ↑heater, ↑warmer, ↑tank, ↑storage tank
• Hyponyms: ↑water back
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noun1. : an apparatus for heating and usually storing hot water (as for domestic use)
2. : a hot water heating system
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a household appliance consisting of a gas or electric heating unit under a tank in which water is heated and stored.
[1875-80]
Useful english dictionary. 2012.