hot water heater

/HH AA1 T W AO0 T ER0 IY0 T ER0/
noun
  1. 1

    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).

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