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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

System Boiler with 
Unvented Hot Water Cylinder

Click for larger picture


Low Pressure
Vented Hot Water System


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© 2005 Abacus Gas