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WordReference Random House Unabridged Dictionary of American English © 2024immer′sion heat′er, - a small electric coil used to heat a liquid, as a cup of water, in which it is immersed. Also called immer′sion coil′.
Collins Concise English Dictionary © HarperCollins Publishers:: immersion heater n - an electrical device, usually thermostatically controlled, for heating the liquid in which it is immersed, esp as a fixture in a domestic hot-water tank
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