What is an immersion heater?

Immersion heaters heat water using electricity.

This can be either from your mains or renewable electricity you’ve generated from solar panels.

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An immersion heater is an electric water heater that sits inside a hot-water cylinder. It’s similar to a kettle, using an electric resistance heater  to heat the surrounding water.  It’s separate from your central heating boiler or radiators and connected its own power supply via a cable.

You can switch an immersion heater on and off or connect it to a timer.

What are the pros of an immersion heater?


  • Immersion heaters are separate from your boiler. This means if the boiler breaks down you can still have hot water
  • There will be hot water for several hours if your tank is well-insulated
  • Homes with time-of-use tariffs can time their water heating for when electricity rates are cheaper
  • Easy to switch on and off so you can stop yourself wasting money

What are the cons of an immersion heater?


  • Heating water using electricity costs more then gas
  • Leaving your immersion heater on all the time is inefficient

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