WHAT is a 'COMBI' BOILER
A 'combi' or combination boiler is a high efficiency water
heater and a central heating boiler combined (hence the name)
within one compact unit. Water is heated directly from the
mains eliminating the need for a hot water storage cylinder and
the associated cold water storage cistern in the roof space.
Because your hot water is delivered to your taps or shower at
mains pressure it's very convenient and can save on your hot
water costs. As an added benefit, showers from a 'combi' can
be comparable with the performance of a power shower.
So a 'combi' can also give you a little extra room to play with,
making it ideal for a flat or a bungalow with very little or no
roof space and it's also the right choice if you want to use your
loft space for a room conversion. Another 'combi' benefit is
that it can generally save you money on installation time and
costs as well as installation materials.