No, electric boilers do not need radiators in the UK. Electric boilers can be used to heat underfloor heating systems, which can provide a more comfortable and even heat than traditional radiators. Electric boilers can also be used to heat the air in a room directly, without the need for radiators. However, if you already have radiators in your home, you can still use an electric boiler to heat them. Electric boilers are a good option for homes that are not connected to the gas grid, as they do not require a flue. They are also a good option for homes that are looking to reduce their carbon emissions. If you are considering installing an electric boiler in your home, it is important to speak to a qualified installer to get advice on the best system for your needs.