The cost of running your system is based around many different factors so it is hard to generalise. When our systems are used in well insulated internal rooms we would expect them to cost up to £6.48/€14.68 to run per square meter per annum, and in conservatories up to £9.44/€21.32 per annum. This should be more efficient than any other electric form of heating and will often be cheaper than a radiator system.
These costs are based on a unit price of electricity of 8p in the UK and 18.2 € cents in Ireland. Both examples assume rooms insulated up to the current building regulations, that the systems are laid directly onto suitable insulation and controlled by our NGT thermostat set to 20 degrees. The first example assumes a 200W/sqm system heating the room for 135 days per annum, ten hours a day and supplying power 30% of the time. The conservatory example assumes a 200W/sqm system heating the room for 210 days a year, eight hours a day and supplying power 35% of the time.
The only things which significantly affect the cost of running one system compared to another are the insulation used beneath the system, the output of the system and the use of an intelligent thermostat. In general, the better the insulation used beneath it, and the higher output of the system, the cheaper it will be to run as long as it is used with an intelligent thermostat like Heat Mat's NGT thermostat/timer.