The real difference between different wattage per m - TilersForums.com

[Flintstone]

What are your opinions on electric underfloor heating outputs? I always go for the 200w option. A few of the uncoupling systems seem to be 160w ish, I’m not sure why that is? The elektra one and the varme one spring to mind. I know warmup dcm pro can go up to about 230w. In a normal kitchen dinner environment or bathroom, is the difference in power really going to be noticeable, Thoughts?

 

[Andy Allen]

Always thought 200w was more for rooms with no other heating in them to heat the room rather than just the floor.
150w for rooms with radiators just to heat the tiles.

 

[Dumbo]

Surely it can only be noticeable during warm up after all 30 degrees is 30 degrees .

 

[Time's Ran Out]

It’s all to do with the substrate.
You should not be using a wattage over 120-140 for wood and 150-200 for concrete.

 

[Flintstone]

What’s the reason for that, John?

 

[Time's Ran Out]

Overheating the wood - risk of fire?
At CTD they always ask which do you want for wood or concrete.
Devi, Raychem, Thermonet all differentiate between the two substrates.
From what I understand the cables are arranged closer to each other for the higher output .

 

[Flintstone]

I wouldn’t advise anyone to install direct to wood. Always insulation before wires, so the heat won’t get to the wood! They all reach the same temp I think, just the time it takes to get there ?

 

[Flintstone]

DEVI 200w Mat



The new DTIF-200 is a high output mat with 200 Watts per m² which makes DEVI´s new heating mat a decisive winner, when it is speedy heating that counts.
Excellent when there is great demand for rapid response time and high output.
High output per m² resulting in instant warmth gives the DTIF-200 a number of possible uses:
• when renovating areas such as conservatories and cellars, which loose a large amount of heat
• in small bathrooms with a relatively small floor area compared to the size of the room
• with timer control
Areas of application and technical specifications


DTIF-200 is designed for installation in floor constructions of concrete or with tiles and where the heating element is installed close to the floor surface.

 

[Time's Ran Out]

Yes - just for concrete.

 

[Flintstone]

I think it means on concrete, or as long as it has tiles on top. You can use Lino and karndean over slc.