- a small electric coil used to heat a liquid, as a cup of water, in which it is immersed.
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
- 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