Night storage and economy 7 immersion heater

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At Ebico we offer our electricity customers two tariffs; a general tariff or an Economy 7 tariff where we charge a lower price for electricity used during the 7 hours of the night (normally from 1am until 8am, although times vary slightly between regions and between summer and winter), and a higher price for electricity used during the remaining 17 hours of the day.

Economy 7 is a great tariff if you use night storage heaters to heat your home and even more so if you install timing devices on your key electrical appliances (e.g. washing machine, dishwasher) so they run at night.  With night storage heaters, the cheaper night time electricity is used to generate and store heat.  Then, during the day, this heat is gradually released to give day time heating to the home. This helps to save money on heating bills.

You should aim to use about the same amount of your energy during the off peak as you would during peak times, to ensure that the tariff is cost effective.

If you are on our Economy 7 tariff and you feel your bills are higher than expected then consider the following:

  • Fit timing devices to ensure your electrical appliances, such as washing machines and tumble dryers, come on at night.
  • Check that your hot water boiler and storage heaters are set on full over night and are using as little electricity as possible during the day.
  • Keep an eye on the weather forecast.  If it’s likely to be a warm day tomorrow you can alter your storage heaters accordingly.
  • Keep a record of the two readings on your meter (i.e. the reading for the day time units and that for the night time units).  This way you can keep track and ensure you are using the Economy 7 tariff efficiently.


If you spend most of your time at home during the day then it’s worth considering changing onto our general electricity tariff.  Call 0800 458 7689 for advice on changing tariffs.