UFH Mat Recommendations

[crispy_wafer]

Hi All,

 

couple of quick q's,

 

Is warmstar still the go to as far as tried and tested UFH mats is concerned please?

 

For installing in a bathroom, onto xps board over caberdeck, how would I determine what Wattage p/m2 to go for?  Tiles or LVT will be the final floor finish.

[Alan Ambrose]

>>> what Wattage p/m2 to go for?

 

Well you could just guess (I did and played it safe at 200W/m^2) - by and large it only affects the warm-up time - the thing will switch on and off to maintain the set-point temp - less switching off and more switching on for a lower wattage mat. If your bathroom is, say, 5m^2 you'll have a 1kW heating source which sounds ample.

 

You could do a quick calc using ubakhus or similar to get the U-value above and below and the likely set-point (28C?), min below floor temperature and min air temperature above.

 

One tip I've seen and used is to either put the themistor in a tube so it can easily be replaced or bury a spare thermistor which can be used later if the first one fails. I've done the latter before - although I can't imagine the failure rate is very high.

[crispy_wafer]

Ta, i’ve put some ducting in and run a sensor to each of the bathrooms.  If the time ever comes I ought be able to pull it through with a new wire attached…

 

I only needed a couple of small mats so heating load wont be too much, and as it happens I’ve gone for a 150 in the highly insulated room, and 200 in the other one, but thats only because the vendor has run out of the 150 the mats in the m2 I wanted…

[garrymartin]

7 hours ago, Alan Ambrose said:

One tip I've seen and used is to either put the themistor in a tube so it can easily be replaced or bury a spare thermistor which can be used later if the first one fails. I've done the latter before - although I can't imagine the failure rate is very high.

+1 They're so cheap, why wouldn't you?