eli5: Why are radiators in houses often situated under a window- surely this is the worst place and the easiest way to lose all the heat?

Question

eli5: Why are radiators in houses often situated under a window- surely this is the worst place and the easiest way to lose all the heat?

In: 2851

Answer 1

VERY simply:
It creates a “heat wall” of air that blocks the cold from coming in through the window, trapping the warm air inside.