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COMBINATION BOILER
The high efficiency condensing
combi or combination boiler is an
ingenious space-saving idea, and
an increasingly popular choice in UK
homes. The major difference
between a combi and any other
type of boiler is that a combi
eliminates the need to store hot
water -- so no hot water cylinder
in the airing cupboard. It is both a
high-efficiency water heater and
central heating boiler, combined
(hence the name) within one
compact unit which usually sits
in the kitchen or utility room, or
sometimes in the airing cupboard.
The space savings result from the
fact there is no hot water storage
cylinder, cold water storage cistern
or other familiar components of a
regular (conventional) heating system.
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SYSTEM BOILER
Unlike a combi, both a system boiler
and a heating only (conventional)
boiler work on the principle of stored
hot water -- but a system boiler
differs from a heating only boiler
in some important respects. Many
of the major individual components
of the heating and hot water system
are built in, which means that
installation is quicker, neater,
easier and more efficient. The boiler
includes an expansion vessel so
there is no requirement for a feed
and expansion tank in the loft, which
allows the installation to save space.
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HEATING ONLY BOILER
If you are replacing an older
model of boiler, the chances are
that you will have a heating only
(conventional) boiler. A typical
conventional system incorporates
a boiler and extended controls,
a feed and expansion cistern,
and a hot water cylinder (usually
in the airing cupboard) which is
often fed by a cold water storage
cistern located in the loft. |
