Combi boilers or combination boilers as they are properly referred to, combine a very efficient water heater with a central heating boiler in one compact unit.
Combi boilers are now the most popular choice of gas central heating boiler in the UK due to their efficiency, relatively small size and because they do not require a separate hot water cylinder or a cold water tank in your loft.
Combi boilers are ideal for small and mid-sized homes with up to four bedrooms. Combi boilers provide instant hot water at your taps by taking cold water straight from the mains and heating it up almost immediately when a hot tap or shower is turned on.
Combi boilers are a type of condensing boiler which means that heat is taken from waste gases to pre-heat water returning from your radiators back to the boiler. This pre-heated water therefore requires less energy and hence less fuel, to heat it up to the required temperature before it is pumped back around your central heating system. This makes condensing combi boilers much more energy efficient than non-condensing boilers, hence we only provide combi boiler quotes for condensing boilers.