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How to Read Your Boiler’s Pressure

Learn the best way to check your boiler’s pressure at home and how often you should be measuring it to keep the central heating system running safely.

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How to read your boiler’s pressure

Your boiler running at the correct pressure level keeps the whole central heating system smoothly and safely. The pressure being too low can cause the system to cut off. Whereas, a pressure that registers as too high triggers the safety valve, with a top-up of pressure needed. Much like Golidlocks, the unit requires it to be ‘just right’ - it must be maintained at that sweet spot too through regular checks.

Boilers come with a gauge which enables you to check the pressure level at home to determine if the unit is using the correct level of physical force. The gauge does this by measuring the force of the hot water that’s running through the sealed system.

What is the correct pressure for my boiler?

Your boiler’s reading should sit between 1 and 1.5 bar of pressure. This level should be maintained and checked regularly with the gauge in order for the central heating system to work efficiently throughout the year.

How to check boiler pressure 

Firstly, you must locate the pressure gauge on your model. Typically, it can be found on the front of your boiler with a needle which runs from 0 to 4 and points to either a red or green section. If the pressure sits in the green area, you’re good to go! If it sits in the red - or doesn’t come out between 1 and 2 - some adjustments or further checks are required to bring things to the right bar of pressure. Some gauges have an LCD screen display, which will display the pressure as you click through the on-screen options.

What can cause issues with boiler pressure

One of the main things that can affect pressure is leaks. If your pressure drops frequently, it is likely an indication that there are leaks in the system. Maintaining your boiler regularly by having an annual service is a great way to ensure it is in good shape. You can receive a service along with more maintenance perks with one of our service plans.

The expansion vessel could be another component affecting the pressure levels, this part should also be checked during a service.


How often do I need to keep an eye on boiler pressure level?

You should try to check the pressure levels around once a month as well as booking in for a service. It is also important to check them after bleeding your radiators, as that can often result in a pressure drop.

To lower pressure level bleed your radiators

To increase pressure open your pressure valves, switch your boiler off and let it completely cool.

Read our full guide on how to lower and fix boiler pressure.

If you are having consistent issues with your boiler’s pressure or more specifically with leaks, it may be time to purchase a new up-to-date efficient boiler.

Check out the new boilers we have available, as well as our payment plans which make it easier to pay-off the part with various payment methods. A new unit will last 15 years on average; seeing you into the next decade hassle-free.