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immersion heater

noun
  1. a small electric coil used to heat a liquid, as a cup of water, in which it is immersed.
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Origin of immersion heater

First recorded in 1910–15
Also called immersion coil.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for immersion heater

immersion heater

noun
  1. 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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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012