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The cost of running an electric underfloor heating system varies in each installation, based around the level of insulation and heat loss, running temperatures, your heating program and the type of room the system is installed in.

The table below provides some general guidance about the likely daily running costs (in pence) of a 150W/m2 Electric Underfloor Heating system used as a primary heat source.

Hours On  1m² 2m² 4m² 5m² 10m² 15m² 25m²
1 1.8p 3p 7p 9p 18p 27p 45p
2 4p 7p 14p 18p 36p 54p 89p
3 5p 10p 21p 27p 54p 81p 135p
4 7p 14p 28p 36p 72p 108p 180p
5 9p 18p 36p 45p 90p 135p 225p
6 11p 21p 43p 54p 108p 162p 270p
7 12p 25p 50p 63p 126p 189p 315p
8 14p 29p 57p 72p 144p 216p 360p

 When calculating these approximate costs* the following assumptions were made:

  • System is installed in a house built to current Part L regulations regarding fuel and power conservation.
  • 150W/m² installed under 8-10mm ceramic tiles
  • A layer of 10mm insulation included in the floor build up.
  • Heat up times are included in the “Time On”.
  • Electricity price of 12p/kWh – average UK price at the time this article was written.


Key factors affecting underfloor heating running costs

Insulation - Boost efficiency by as much as 50%

Effective substrate insulation, such as reduces downward heat loss and provides faster heat up times. If your system reaches the desired temperature more quickly it does not need to call for heat for such a long time, which has a dramatic effect on your running costs.

We estimate that installing a layer of our 10.5mm insulation board will improve the efficiency of an electric underfloor heating system by as much as 50% when compared with an un-insulated concrete substrate.

Room Height

Some rooms are taller than others, which means they have more air volume compared to a room with identical lateral dimensions. Generally the higher the ceiling, the more energy is needed to heat the room. Electric underfloor heating is a much more efficient way to heat a room with high ceilings as the heat radiates into the room from the floor up, providing a comfortable even heat signature.

A traditional radiator would heat the top of the room first, wasting a lot of energy in vaulted ceilings, whereas electric underfloor heating warms the area that people use making it more efficient.

Heat Loss

Draughts, extractor fans and poor insulation cause heat loss which the heating system must compensate for. This results in the electric underfloor heating system to work harder, for longer which has an adverse effect on efficiency and your heating bills.

Be sure to install insulation with every electric underfloor heating system to provide adequate substrate insulation and improve your running costs by as much as 50%.

Heating Program - Use a programmable thermostat

An efficient, personalised heating program or schedule will ensure your electric underfloor heating system is only on when you need it, minimising wasted energy. 

Touchscreen programmable is an attractive addition to any room and provides a fully programmable 7 day, 6 event heating program that you can schedule around your daily routine.

Comfort and Economy temperatures

recommend a Comfort temperature of 23-25°C and an Eco temperature of 18°C.  Operating between these temperatures will maintain an economical minimum temperature and maximise comfort and efficiency. Our Touchscreen programmable 

*Please note that these approximate running costs are for illustrative purposes only and do not imply any warranty or guarantee as regards energy consumption and/or running costs. All information on this page including but not limited to the electric underfloor heating running costs is a copyright of HeatThat and should not be copied or used without written permission from HeatThat.

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