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Immersion heaters heat water using electricity similar to a system found in a kettle. Connected to their own power supply, immersion heater thermostats can be easily switched on and off meaning they are ideal for primary and backup water heater for the property. Immersion heaters are a necessary component for direct unvented cylinder systems to provide a heated hot water supply. We offer a huge range of immersion heaters in a selection of outputs to correspond with various cylinder materials.