How Often Should I Need To Top Up The Pressure In The Heating System?

One of the most common problems that we come across with central heating systems is boilers that do not operate due to there being insufficient pressure. Often, using the filling loop is enough to repressurise the system and get it working, but how often is too often and when might a loss of pressure indicate a problem or leak? So how often should I need to top up the pressure in the heating system?

How often should I need to top up the pressure in the heating system?

When your heating is not turned on and your radiators are cool, the pressure displayed on your boiler should be between 1 and 1.5 bar on the pressure gauge. This is often indicated by a green section beneath the indicator needle). If pressure drops below 0.5 bar (in the red section), then water has been lost from the system and it must be replaced. Note that the red part of the dial can also indicate the pressure being too high, so you may have a red section at about 2.75 bar. If the pressure gauge indicates high pressure, you need to bleed a radiator until the pressure gauge drops back down to between 1 and 1.5 bar.

If the pressure goes up by more than 1 bar when the heating is on then the expansion vessel may need repressurising. This requires a heating service engineer. The pressure in the system usually needs topping up once or twice per year. If you are repressurising your heating system more frequently than this, please call us for advice.

L&W Heating and Plumbing

Whether you have a combi boiler that is still under guarantee or warranty or not, an annual service is essential to keep it working efficiently and safe. If you do have a boiler guarantee, it will most likely be invalidated if you do not have an annual boiler check completed. If you are in need of a qualified gas engineer then call our team at L&W Heating and Plumbing as we are the local experts at gas safety in the Warrington, St Helens and Wigan areas. Call us today for more information.

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