The traditional reason
Windows are usually the coldest part of a room. Air cooled by the glass sinks towards the floor and creates a chilly draught. A radiator beneath the window warms that air as it falls, so the cold draught doesn't spread across the room.
Walls under windows are also often the least useful for furniture, so it made sense to put radiators there.
With modern glazing
Good double or triple glazing loses far less heat than old single glazing, so the cold draught is weaker. That gives more freedom to place radiators elsewhere, such as on inside walls or beside doors.
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Choosing a position
Think about:
- Where cold draughts come from
- Keeping long curtains from covering the radiator
- Furniture layout
- Pipe routes and how easily they can reach the new position
