Aidan wrote:
Most UFH installed in screed needs
to be run continuously, the heat up time for the floor slab mass is too
long to operate intermittently like conventional radiator heating.

I beg to differ.

Mine takes about an hour to an hour and a half to be up to temperature.

The
air temperature can be lower with UFH, whilst still being comfortable,
due to the increased radiant output from the floor, i.e., the air is
cooler, so heat losses from you to the air are higher but heat losses
from you by radiation are lower, so you still feel comfortable.


20C would seem to be Ok ish for a hall area..I suspect its just
under-specced.