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PRESSURISED
SYSTEM
There
are various systems which can be described as pressurised:
Combination
Boiler 
Pressurised
Central Heating and Unvented Stored Hot Water.
There
is no cold water storage tank or central heating header tank.
Water is heated in a special cylinder at mains pressure. Because
water is pre-heated, it can be delivered to more than one tap at a time
as with a conventional cylinder. However, as the system is at
mains pressure, flow rates will normally be much improved (depending on
local mains water pressure). This system is particularly
advantageous where there is a high demand for hot water such as
properties with more than one bathroom or where improved shower
performance is required without the use of a pump. Also
advantageous where no head is available for cold water storage tanks
i.e. loft conversions or flats.
Some
older systems can be upgraded using the existing boiler subject to
building regulations. However, it is generally advantageous to use
a purpose-designed pressurised system boiler which includes, within its
case, all the components required for primary pressurisation.
Systems
are available giving pressurised stored hot water and conventional
central heating (no cold water storage tank but retaining central
heating header tank) or pressurised central heating and conventional
stored hot water (retains cold water storage tank but no central heating
header tank) or combinations thereof. Please telephone for further
information/advice.
Improvements
From April 2002, changes
in the Building Regulations effect how your installer replaces your
boiler/cylinder or makes changes to your heating controls.
Fitting
a room thermostat, thermostatic radiator valves or a time switch or any
combination of these will give improved control over comfort conditions
and better economy by switching the boiler off whenever it is not
required.
From
time to time your central heating system may require bleeding or
re-pressurising.
All installations are carried out in accordance with relevant
regulations and good practice
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