There are two options for electrically heating towel warmers, Electric only & Dual Fuel Kits. For Electric only heating elements the Towel Warmer of your choice is filled with a special heating solution & the Electric Heating Element is then factory fitted & sealed. The wattage of the element is matched according to the size of the towel warmer. Dual Fuel Kits are for use on a standard wet central heating system. The electric element can then be used to heat the towel warmer when your central heating is turned off, for example during the Summer months. Disclaimer: When an electrical element is used to heat a towel warmer or radiator you will not get identical performance as you would connected to a central heating system as there is no circulation of liquid & it will therefore take longer to heat up & will be noticeably hotter near the element. After 1 to 2 hours of continuous product use the heat would have spread but there will still be temperature variances across the surface.