What is the correct pressure for a boiler?
Boiler pressure is one of the most common things that can go wrong with central heating systems. For your boiler to work efficiently, the water pressure needs to be stable.
If the pressure is too high or too low it can prevent your boiler from working, and the wrong pressure over time can shorten the lifespan of the system. This guide answers the key questions.
What does boiler pressure mean?
Boiler pressure refers to the pressure of the hot water that runs throughout your central heating system. Water pressure relates to the pressure of the water that flows through your taps.
What is the correct pressure for a boiler?
The pressure on a boiler should sit between 1 and 1.5 bar. Most manufacturers recommend an optimal working pressure of around 1.3 bar. Consult your boiler’s manual or contact an expert, as adjustments require professional knowledge.
How can I tell if my boiler pressure is at the right level?
A key warning sign is the boiler repeatedly shutting down, disrupting central heating. Check the pressure gauge: if the reading sits in the red zone rather than the green, seek professional inspection.
How do I get the pressure down on my boiler?
Unless you have relevant expertise, get professional help. Generally, reducing boiler pressure involves bleeding your radiators to release system pressure with a radiator key until air stops and water trickles out.
Should my boiler pressure increase when heating is on?
When heating activates, water in the pipes and radiators heats and expands, raising system pressure. Ideally pressure should not increase more than 1 bar above optimal working pressure. Contact a professional for guidance on your system.
Why does my boiler keep gaining pressure?
Excessive water in the expansion tank coupled with insufficient air may cause this. The fix involves closing the valve between the expansion tank and boiler, draining the tank, then refilling the system. Professional assistance is strongly advised due to safety risks.
If your boiler pressure keeps causing problems, our team can help, see our guide on what to check when your boiler is not working.