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Selecting a Power Rating

Your electric radiant underfloor heating system may be chosen to simply provide a warm floor – and the power rating would typically be 100W/sq m – so that you have the comfort of walking on a floor that doesn’t feel cold. Alternatively, you may wish to install an electric radiant underfloor heating system as the primary (or main) source of heating for the room or whole building.

As a primary source of heating, the power rating of the electric radiant underfloor heating should be specified as 1.3 x the room or dwelling’s heat losses.

The floor type and area available will determine what products may be specified. For example, when you intend to install the underfloor heating system as a primary source of heating onto existing floors the power rating is typically limited to 150W/sq m to 200W/sq m. If your project is a new-build construction you can use 200W/sq m when the Vysa-Mat Classic underfloor heating mats are embedded in the floor screed.

Buildings constructed to the latest requirements of the Building Regulations need less powerful Vysa-Mat underfloor heating mats than those built to the requirements prevailing when the building was constructed some time ago.

If you provide our technical department with all of the necessary data required, plans, materials of construction etc, we can undertake a heat loss calculation for you. However, if you do not have such data we can very often suggest scheme designs from less detailed information based on our very extensive experience.

We make Vysa-Mat Classic heating mats with higher output power ratings – 150W/sq m to 200W/sq m – to compensate for the fact that concrete floors absorb heat at a higher rate than timber floors.


When installing Vysa-Mat Classic heating mats or Vysa-Cable heating cable under a 2″ (5cm) screed of sand and cement in new-build applications, higher output power ratings may be required. Higher output power ratings heat up the room quicker but do not necessarily use more energy.