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

When the heating system is cool, the pressure should be between 1 and 1.5 bar on the pressure gauge (the indicator needle would usually be in the green section).

If pressure is below 0.5 bar (down in the red section), water has been lost from the system and must be replaced. Note: The red part of the dial could also indicate the pressure being too high (about 2.75 bar or more). If the pressure gauge indicates a high pressure as a result of over filling, you will need to bleed an radiator until the pressure gauge returns between 1 and 1.5 bar. How To Bleed a Radiator

If pressure rises by more than 1 bar when the heating is up to temperature then the expansion vessel may require repressurising. This will require a service engineer. The pressure in the system will usually require topping up once or twice a year. If you are having to repressurise your heating system much more frequently, please contact us.

The heating system is constantly losing pressure what should I do?

If you are constantly losing pressure in the heating system you could try the following to establish the cause by:

Checking all visible joints including radiator valves and connections for obvious signs of leakage. Ensure that there are no leaks to any under-floor pipe work.

Check that there is no water being discharged from the pressure relief valve (sometimes referred to as an overflow). This pipe usually goes from the boiler through to an outside wall and terminates outside. Check this for signs of dripping. If it is wet, this may mean that the pressure relief valve is faulty.

In either case, if your heating system keeps losing pressure to gain advice or help you should contact us.