Are Fan Heater Expensive to Run?

Fan Heater Running Costs For 2023 UK Price Cap

Fan heaters tend to be popular for poorly insulated spaces. This is due to their ability to throw out hot air faster than it can be lost, this is why they are so good at heating poorly insulated spaces such as garages.

One of the most common questions asked, are fan heaters expensive to run? In this guide, we will look at the cost of running a fan heater in the UK with the new 2023 price cap and see how expensive various fan heaters are, and if they are energy efficient for your needs.

How Much do Fan Heaters Cost to Run?

First. Let’s look at the most common heat power outputs for electric fan heaters, this will help us work out the fan heater running cost for one hour.

Fan heaters are available in the following heat power outputs:

  • 750 Watts
  • 1000 Watts
  • 1500 Watts
  • 1800 Watts
  • 2000 Watts
  • 2200 Watts

Energy companies will charge you per kilowatt-hours, one kilowatt-hour when converted to watts is 1000 watts, 1 kWh = 1000 watts. Below I will calculate the cost of running a fan heater for one hour from the heat outputs above, I will use the average cost from 2023 price cap of £0.28p

  • 750 Watts = £0.19p
  • 1000 Watts = £0.28
  • 1500 Watts = £0.42p
  • 1800 Watts = £0.50p
  • 2000 Watts = £0.56p
  • 2200 Watts = £0.62p

These figures have been rounded to the nearest even number to make things easy to work out. Below, I will explain how you work out the cost of running a fan heater.

First, you have to convert heater watts output to kilowatts per hour:

  • 750 Watts = 0.75 kWh
  • 1000 Watts = 1 kWh
  • 1500 Watts = 1.5 kWh
  • 1800 Watts = 1.8 kWh
  • 2000 Watts = 2 kWh
  • 2200 Watts = 2.2 kWh

In order to work out the fan heater running cost per hour, you will need to take the kilowatt-hours (kWh) figure and times it by your cost of electric for 1 kWh, as of 2023 this will be around £0.28p. The formula should look like this:

  • 2 x 0.28 = £0.56p

The running cost of a 2000 watt (2kW) fan heater will be 56 pence an hour

The only reason a fan heater might be expensive to run is because of the current high electricity prices. It may seem like the best fan heater to buy is the 750 watts one, but you have to buy the right heat output for certain size rooms, a 750 watt fan heater will be massively underpowered and not provide much heat in a 22 square meter room. The size of the room determines the fan heater you need.

How to Select the Right Wattage Fan Heater to Run in a Room?

Below, you will discover what heat output is required to heat a room. This will help you select the right Fan heater to run in a room, and ensure the fan heater provides adequate heat, and actually warms the room to nice comfortable levels. The below figures are for slightly below average roof insulated solid brick wall end terraced house.

Room size in square meters x 100 watts per square meters

  • 500 watts can heat up to 5 square meter room
  • 600 watts can heat up to 6 square meter room
  • 800 watts can heat up to 8 square meter room
  • 1000 watts can heat up to 10 square meter room
  • 1200 watts can heat up to 12 square meter room
  • 1500 watts Can heat up to 15 square meter room
  • 2000 watts can heat up to 20 square meter room
  • 2300 watts can heat up to 23 square meter room
  • 2500 watts can heat up to 25 square meter room
  • 3000 watts can heat up to 30 square meter room

The figures above a rough estimate as to what you will need, if you have a modern property with excellent insulation, cavity wall insulation, low ceilings, you can most likely use a lower power fan heater. If you have a 20 square meter room in a new house, you can most likely get away with using a 1000 watt fan heater.

If you live in an old property with high ceilings, single glazed windows, and only roof insulation, for a 20 square meter room, you will want something above 2200 watts.

Does a Fan Heater Use a Lot of Power?


Yes, fan heaters do use a significant amount of electricity. The power consumption of a fan heater is determined by its wattage. Commonly, fan heaters have a power rating between 1,000 to 2,500 watts.

Running a 2,000-watt fan heater for one hour, for example, would consume 2 kilowatt-hours of electricity. If the heater were used for eight hours a day, it would consume 16 kilowatt-hours, which could add up to a substantial amount over a month.

Keep in mind that the cost of running a fan heater will also depend on your electricity tariff. It’s always a good idea to check the power rating of your fan heater and understand your electricity tariff to calculate the potential cost.

Remember, while fan heaters can provide quick and concentrated heat, they are best used for short periods or in small spaces. More energy-efficient heating solutions should be considered for larger spaces, longer durations or whole house heating solutions.


In conclusion, fan heaters offer a great solution for heating poorly insulated spaces like garages, find the best fan heaters here. However, their running costs can be relatively high due to their substantial power consumption. The cost of running a fan heater varies depending on its wattage and the price of electricity, which as of 2023 is around £0.28p per kilowatt-hour in the UK.

Moreover, it’s crucial to choose a fan heater with the right wattage for your specific room size. A fan heater that’s too weak won’t adequately heat a large room, while an overly powerful one may consume more energy than necessary for a small space. Therefore, understanding the relation between room size and heater wattage is key to achieving comfort and cost-efficiency.

Lastly, remember that these figures are estimates. Factors like insulation, ceiling height, and window type can also affect how much heat you’ll need. Always consider the specific characteristics of your home when selecting a fan heater. With careful consideration and informed choices, a fan heater can be an effective and reasonably economical heating solution for your space. You can learn more about electric fan heaters here.