A centrally heated towel rail is a modern necessity. An electric towel rail is always there when you need it. But a DUAL fuel heated towel rail will transform your bathroom for the better (and slash your heating bills as a bonus).
There are a number of different areas in your home where you can place your radiator, they don't have to be under the window! As long as the radiator isn't blocked in any way, it's purely an aesthetic choice as to where you place it.