Water heated by a boiler
In most homes, the hot water is supplied by the main central heating boiler, either directly if it is a combi boiler, or from a hot water cylinder. Often there will be an electric immersion heater in the cylinder as well.
Tip – use the boiler to heat the water, even in the summer. The immersion heater will be more expensive, and should only be used as an emergency back-up.
Find out more about controls that will let you run your boiler more efficiently.
Water heated by immersion
In some homes, particularly those with electric storage heaters, the water can only be heated by immersion heater. There may be two immersions, one in the top of the cylinder and one in the bottom. Usually the bottom heater comes on at night, and heats the whole cylinder using cheap off-peak electricity. The top heater is used to provide additional hot water during the day if required, using expensive peak rate electricity.
Tip – DO NOT leave a peak rate immersion heater on all day and all night. You will waste a lot of money keeping water hot when you don’t need it.
Find out about using controls for your system that will use less energy and save you money.