On 14/11/17 11:08, Roger Mills wrote:

But it's not the floor temperature which matters - it's the temperature
of the room which is heated by the floor which is important. If the room
is hot enough, you can allow the floor to cool a bit - a bit like
turning radiators on and off, but with a long time cycle.

I'm treating a 3m2 floor with UFH like a towel rail - it could run flat
out (200-300W max) and not make a huge impact (and we have the option to
run this cooler, eg 35C).

It's main function is comfort and drying the floor - it doesn't seem
worth bothering to actually control it