Are your underfloor heating mats secondary or primary output?
The issue is not the underfloor heating, and more the insulation in the property. The mats are 150w/m2 (required for VDE approval) and is reliant on suitable insulation within the property. Insulation beneath the ufh, to ensure maximum heat goes into the room, and then insulation within the room, to ensure the heat remains in the room. In new properties, there is no issue, due to insulation standards being extremely high. In older properties, where insulation is lacking, is where we forsee an issue. If insulation is up to scratch, there should not be a problem. If the customer is concerned, or want to ensure a suitable output, a heat loss calculation must be carried out.
If you have any other questions I will forward them to the manufacturer and then reply to you.
David 020 7193 0953