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Hiya,
Here's why: the air near the window (or walls) is chilled due to heat loss out through to the outside. The chilled air drops towards the floor.; and left unchecked, this causes drafts throughout the whole room.
By putting the heater under the dropping chilled air, it can best counteract the air flow -- the heated air mixes with the chilled air and then moves throughout the room better.
If the heater/radiator is located near the inside of the room, it would warm the air and it would move in the same direction as the chilled drafts, and this would not be as effective at warming the whole room.
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