A radiator having a sealed flow path through which electrically heated fluid is arranged to pass. A control unit is provided in the radiator which is arranged to control operation of the radiator. The radiator also has a receiving unit arranged to receive at least one operation instruction from a remote control unit in use. The receiving unit is arranged to pass the at least one operation instruction to the control unit so that, in use, the radiator is controllable by the remote control unit. Also, an inlet pipe supplies water to a heater by a pump. The water then passes through a pipe comprising an inverted U-bend which controls air at the top of the bend. The radiator comprises a sealed system that plugs into the mains. Different radiators are able to communicate with each other.