Central heating is the most common form of heating in the UK. A single boiler heats up water that is pumped through pipes to radiators throughout the house. As well as heat, this kind of system also provides hot water to the kitchen and bathroom taps.
The majority of boilers run on mains gas, but in rural or more remote areas where this is not available, the boiler can run on oil, LPG (tank gas), coal or wood. Mains gas is usually the cheapest, and it has the lowest carbon dioxide emissions, apart from wood. Some systems also have an electric immersion heater to provide a back-up heat supply for hot water.