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).
PRESSURISED CENTRAL HEATING AND UNVENTED STORED HOT WATER
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
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.
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.