When selecting an under floor heating kit for your room there are a number of considerations:
For Bathrooms...
Measure the overall dimensions of the room and calculate the square meterage. From this deduct the square meterage of the following things
- Bath
- Toilet
- Floor mounted vanity
- Shower (unless you have a need to go into the shower)
- Any other area where you cannot walk (bidet etc)
Effectively you want to get a square meterage of the part of the room where you can walk. Using the table below you can see what size kit you require.
| Free Floor Area | Mat Size Required | Power (Watts) | Linear length (m) |
| 1.2 to 1.7 sqm | 1 sqm | 200W | 0.5 x 2m |
| 1.8 to 2.2 sqm | 1.5 sqm | 300W | 0.5 x 3m |
| 2.3 to 2.7 sqm | 2 sqm | 400W | 0.5 x 4m |
| 2.8 to 3.2 sqm | 2.5 sqm | 500W | 0.5 x 5m |
| 3.3 to 3.7 sqm | 3 sqm | 600W | 0.5 x 6m |
| 3.8 to 4.2 sqm | 3.5 sqm | 700W | 0.5 x 7m |
| 4.3 to 4.7 sqm | 4 sqm | 800W | 0.5 x 8m |
| 4.8 to 5.2 sqm | 4.5 sqm | 900W | 0.5 x 9m |
| 5.3 to 5.7 sqm | 5 sqm | 1000W | 0.5 x 10m |
| 5.8 to 6.2 sqm | 5.5 sqm | 1100W | 0.5 x 11m |
| 6.3 to 7.4 sqm | 6 sqm | 1200W | 0.5 x 12m |
| 7.5 to 8.6 sqm | 7 sqm | 1400W | 0.5 x 14m |
| 8.7 to 10 sqm | 8 sqm | 1600W | 0.5 x 16m |
Alternatively, if you have Excel visit the Radiant Australia website and download their calculator.
For Living Areas....
Measure the dimensions of the room and calculate the overall area, but deduct 100mm from each measurement as you only up to 100mm away from the walls. Depending on the room, you may want to make further deductions based on the function of that room.
For example.
In a kitchen, you would definately deduct all cabinetry, island benches, fridge recesses, etc.
In a lounge area, you may want to deduct items such as sofas, tv cabinets, coffee tables, etc. Only deduct these if they are always going to remain in the same positions.
In a bedroom, you may want to deduct your bed.
Once you have a final square meterage for the areas you want to install floor heating minus the deducations, you can use the following table to calculate the kit size you need.
| Floor Area | Mat Size Required | Power (Watts) | Linear length (m) |
| 6.0 to 7.9 sqm | 6 sqm | 900W | 0.5 X 12m |
| 8.0 to 8.9 sqm | 7 sqm | 1050W | 0.5 x 14m |
| 9.0 to 9.9 sqm | 8 sqm | 1200W | 0.5 x 16m |
| 10.0 to 10.9 sqm | 9 sqm | 1350W | 0.5 x 18m |
| 11.0 to 11.9 sqml | 10 sqm | 1500W | 0.5 x 20m |
| 12.0 to 12.9 sqm | 11 sqm | 1650W | 0.5 x 22m |
| 13.0 to 13.9 sqm | 12 sqm | 1800W | 0.5 x 24m |
| 14.0 to 14.9 sqm | 13 sqm | 1950W | 0.5 x 12m + 0.5 x 14m |
| 15.0 to 15.9 sqm | 14 sqm | 2100W | 0.5 x 14m + 0.5 x 14m |
| 16.0 to 16.9 sqm | 15 sqm | 2250W | 0.5 x 14m + 0.5 x 16m |
| 17.0 to 17.9 sqm | 16 sqm | 2400W | 0.5 x 16m + 0.5 x 16m |
| 18.0 to 18.9 sqm | 17 sqm | 2550W | 0.5 x 16m + 0.5 x 18m |
| 19.0 to 19.9 sqm | 18 sqm | 2700W | 0.5 x 18m + 0.5 x 18m |
| 20.0 to 20.9 sqm | 19 sqm | 2850W | 0.5 x 18m + 0.5 x 20m |
| 21.0 to 22.9 sqm | 20 sqm | 3000W | 0.5 x 20m + 0.5 x 20m |
| 22.0 to 24.9 sqm | 21 sqm | 3150W | 0.5 x 20m + 0.5 x 21m |
| 24.0 to 26.9 sqm | 22 sqm | 3300W | 0.5 x 21m + 0.5 x 21m |
| 26.0 to 28.0 sqm | 23 sqm | 3450W | 0.5 x 21m + 0.5 x 22m |
