Pipe centres

[RichS]

Another UFH question.

How do you determine what the pipe centres should be, i.e 200mm / 150mm???

In a past life I used to use a heat loss calc programme from Stelrad, Stars I think it was called, to work out radiator sizes needed. Quite simple, after data input it told you the output required for each room and I just sourced the radiator size to suit.

I know it's got to be similar for UFH but how do you calculate the heat output, is there some sort of "x amount per linear metre" figure.

[Onoff]

Or just wing it like some on here...

 

[PeterW]

3 hours ago, RichS said:

Another UFH question.

How do you determine what the pipe centres should be, i.e 200mm / 150mm???

In a past life I used to use a heat loss calc programme from Stelrad, Stars I think it was called, to work out radiator sizes needed. Quite simple, after data input it told you the output required for each room and I just sourced the radiator size to suit.

I know it's got to be similar for UFH but how do you calculate the heat output, is there some sort of "x amount per linear metre" figure.

 

Loopcad does it for you based upon the room size and the walls etc. 

 

I've gone 150 in most places with the odd 200 but that's based upon 31c flow temperature which I know I can take up or down pretty easily if I find it's a bit too warm.