Coronavirus (COVID-19) local information and advice:

Advice and how our services are affected

One Reading Community Hub Support

Advice for business

Hot water immersion tank

The immersion tank is the hot water supply for your property. You can usually find it in a hall or bathroom cupboard.

It should look a little like this picture.

Hot water immersion tank
Hot water immersion tank

1 - Economy 7 switch - this will come on during the night and give you half price hot water.

2 - Boost switch (avoid having this on as it's expensive)

3 - The water tank is very well insulated and will keep water hot all day.

The cheapest way to get hot water

  • Leave the Economy 7 switch turned on - it will come on automatically in the night for 7 hours. The electrical lead goes to the bottom of the tank!
  • Turn off the 'Boost' switch - the electrical lead goes half way to the tank

What it costs* to heat water

Day time = 42 pence / hour

Overnight charge 21pence / hour

Heating water for 7 hours overnight costs 7 x 21p = £1.47

*rough estimates based on 14 pence per kilowatt

Switch To High Contrast Mode