"The Natural Philosopher" wrote in message
...
IMM wrote:

UFH does not promote heat low down. Hot air rises. When the heat
emitter is
the floor, when the hot air moves from the emitter to the top of the
room it
passes you, heating you along the way.

Well, experience shows that it may not heat low down, but it does
eliminate a cold layer near the floor.

With radiators cold air sinks to the floor
and moves across it to the
radiators, gets hot and rises immediately.
So you get localised hot
spots near the rads, and a thermal gradient through
the room and cold feet.

This is why rads are put on the walls with the cold front, and under
windows. Doing this reduces/eliminates the cold floor/cold feet. If a rad
is not fitted under a window, the cold air from the window front drops down
to floor level, across the floor, cooling your feet and reheated by the rad
on the others wall. Putting the rad under the windows prevents this, and
also releases wall space.