Output, measured in watts per square metre, decides how quickly a floor warms and how much heat loss it can overcome.
Start with the floor finish
Tiles and stone handle higher outputs. Timber, laminate, vinyl and carpet need lower outputs and a floor temperature limit, set with a floor sensor.
Then look at heat loss
A bathroom over an uninsulated slab, with an external wall and a large window, needs more output than an upstairs ensuite over a heated room.
- 150 W/m²: most tiled bathrooms and kitchens
- 200 W/m²: cold slabs, exposed rooms and faster warm-up
- Up to 100 W/m²: floating timber and laminate
Heated area is not room area. Leave out spaces under vanities, baths, showers bases and fixed cabinets. The heated area is usually 70 to 85% of the room.
See the full table on our sizing page.
Need help with your project? Call 1800 519 654 or send us your plans for a quote.
