- Draw your floor area onto squared paper, marking any unheated areas such as a bath, sink, toilet or kitchen island unit.
- Calculate the area to be heated by subtracting any unheated areas from the total floor area.
- Choose the kit size that is the closest match for your heated floor area. If the area to be heated falls between two ElectroMat® kit sizes, always choose the smaller kit size to avoid the risk of overheating, and add additional decoupling membrane to cover the unheated areas if necessary.
Example heated area calculation
Small en-suite shower room 2x2m²
4m² de-coupled floor area.
1.7m² heated floor area.
Thermostat positioned outside the room.
In this instance, the area to be heated by the ElectroMat® underfloor heating kit is 1.7m², with the remaining 2.3m² floor area to be left unheated.
Choosing the 1.5m² kit ensures sufficient cable to heat the 1.7m² space, laying the cable at the recommended 3 dimple spacing. The 1.5m² kit includes 2m² of decoupling membrane – an additional 2m² of decoupling membrane can be purchased to run underneath the shower, basin and WC, if desired.
| ElectroMat® kit size (m²) | Maximum area covered by supplied de-coupling membrane (m²) | Max recommended heating area (m²) |
|---|---|---|
| 1 | 2 | 1.2 |
| 1.5 | 2 | 1.7 |
| 2 | 3 | 2.3 |
| 2.5 | 3 | 3.0 |
| 3 | 4 | 3.5 |
| 4.5 | 5 | 4.7 |
| 5.5 | 6 | 5.8 |
| 6.5 | 7 | 7.0 |
| 9 | 10 | 9.5 |
| 11.5 | 12 | 11.8 |
| 13.5 | 14 | 14 |
| 18 | 19 | 19.0 |
