A regular boiler uses works in conjunction with a hot water storage cylinder and 2 cold water top up tanks to provide central heating and hot water.

A combi boiler heats water straight from the mains using a heat exchanger, providing hot water on demand, with an efficiency rating of over 90%.

System boilers heat water directly from the mains and then store it in a tank, this allows it to be tapped at multiple sources without any pressure loss.