"Beartums" wrote in message
Currently, our contractor has placed
our hot-water radiators on the shelf under windows. My wife is convinced
that the radiators will never properly heat the rooms since heat goes up.
I believe that the room is actually warmed by being filled with heat
(otherwise, you would need radiators on all walls and even in the middle
of
the room to heat the floor).

While I believe the optimal placement of the radiator would be on the
floor, the sizing of the radiator is MUCH more important,


It will work just fine. Way back in the mid 60's I worked for a major
manufacturer of heating products. Two of them were Window-line and
Sill-line systems. They are installed in buildings all over the country.
In your case, it may work better than the floor.