water heater

noun
a household appliance consisting of a gas or electric heating unit under a tank in which water is heated and stored.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The furnace and hot water heater are only a few years old.
There are new thermal windows on all three levels, a new water heater and new
  central air conditioning.
Has about as much style as a hot water heater, but other than that it has a lot
  going for it.
We had a device hooked to our electric hot water heater.
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