What Is The Optimal Boiler Pressure?

To have a well-heated, warm house, your boiler needs to be able to circulate water through the system. To do this, it requires an adequate amount of pressure. Using this guide, you will know what pressure your boiler should be and what to do if it is too low or too high.

What Is The Optimal Boiler Pressure?

There is a vast range of boiler models, so the correct pressure for one model will not be the same for another. In general, though, the pressure should be between 1 and 2 bar.

You can check the pressure of the boiler by looking at the pressure gauge, usually located at the front of the boiler. You should see a small needle, placed in a semicircle, pointing to numbers, sometimes there will be a little green are indicating safe pressure values.

Why Is Boiler Pressure Critical?

Without proper boiler pressure, your system will not be able to circulate warm water around the pipes and through the radiators. The pressure should be kept constant so that the boiler can function effectively.

Is My Boiler Pressure Too High?

You can identify the high pressure of the boiler by checking whether the needle on the gauge exceeds 2 or has drifted into the red zone. To reduce the pressure of the boiler, you need to drain at least one radiator in your house – if you find that some radiators do not heat up properly, then they are probably full of air and are good ones to bleed first.

The boiler works continuously at high pressure, which can cause failures in the system and even damage your home. Therefore, if bleeding the radiators doesn’t solve the issue, it’s best to call a heating engineer.

Is My Boiler Pressure Too Low?

When the pressure gauge needle falls below 1, the boiler pressure is too low. You can get pressure by re-pressurising the system, but that’s a whole different guide.

When the pressure drops too below a certain threshold, most systems will automatically shut down, leaving you without hot water or home heating. So it doesn’t hurt to keep an eye on the boiler pressure.

Why Does The Pressure Increase As The Boiler Heats Up?

When the water in your system is heated, it expands slightly, so when your heating is turned on, there is a natural increase in the pressure within the pipes, radiators, and tank, which is nothing to worry about.

How Often Should I Check The Boiler?

Checking the pressure of the boiler is not something you have to do every day. Try to remember to take a look once a month. For accurate readings, wait till the boiler is off.

Remember to check the pressure of your boiler when;

Bleeding Radiator

If you find that one or more radiators in your home, do not heat up properly, then the system may have air that requires bleeding. Once you perform the bleeding from the radiator, check that the boiler pressure does not fall. If so, you must delete the system.

At The Start Of Autumn

Entering the cold winter, you will be wondering if your boiler is ready for increased heating needs, so check if the pressure is too low.

Boiler Pressure Drops

If your boiler constantly loses pressure after refuelling, this indicates a leak somewhere in the system. Look at any wet patches that can be caused by leaks at home, but do not look at the boiler itself, which should always be done by a qualified engineer.

Last Updated on November 7, 2021

Last Updated on November 7, 2021


Author: Indra Gupta

Indra is an in-house writer with a love of Newcastle United and all things sustainable.

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