Electric central heating boilers are highly efficient devices characterized by a lack of exhaust fumes and pollution, and thus a lack of chimney. The advantages also include the absence of restrictions in terms of the location of the device in the building. The boiler does not require a gas connection or a room for coal or wood, which saves space. Electric boilers are also relatively cheaper than their equivalents powered by gas or coal. These appliances may have a built-in hot water tank, which is heated by an electric heater.