If your radiators in the bathroom are on the hot water circuit to/from the cylinder that is correct and is still current practice (this means you canh dry towels on them in the summer when the heating is switched off). For a ch/hw system I usually do plumb the towel rail into the hot water not the central heating.
The way to solve your problem is to restrict the flow to the radiators in question by cranking down the lockshields.
The other poster is getting mixed up with a DIRECT cylinder, a very old fashioned idea in which the towel rails should be made from brass.
The way to solve your problem is to restrict the flow to the radiators in question by cranking down the lockshields.
The other poster is getting mixed up with a DIRECT cylinder, a very old fashioned idea in which the towel rails should be made from brass.