If you choose a central heating towel rail, they will generally turn on when the heating is switched on. These speciality radiators don’t typically cost a lot to run, but the answer depends on personal preference and the type of unit you have. An electric towel rail can be switched on (or programmed, depending on the model) and off as and when you need it. A dual fuel towel rail can be used as a central heating towel rail in the colder months, and an electric towel rail in the summer.