Why does my boiler pressure fluctuate?

Small fluctuations in pressure are entirely normal. With a Combi boiler, pressure naturally increases when the heating is on as your boiler combusts fuel to heat the water.

Does water pressure affect central heating?

Low boiler pressure will not necessarily damage your boiler or central heating system. However, it will affect their performance. Lower pressure means your system has to work harder to heat your home.

Can boiler pressure go up and down?

It’s normal for boiler pressure to rise as the boiler heats up, and fall as it cools down. The ideal boiler pressure is between 1 and 2 bars. But so long as the pressure gauge needle isn’t going into the red zones, there’s nothing to worry about.

How much should my boiler pressure fluctuate?

1 to 1.5 bars
Here’s a rough idea of the fluctuations in boiler pressure that you really don’t need to spend time worrying about… 1 to 1.5 bars on your pressure gauge ⇨ normal pressure level when your central heating is switched off. Around 2 bars ⇨ normal pressure level when your boiler is active/heating up.

Why does my central heating keep losing pressure?

There are two main problems that typically cause a loss of pressure – water escaping somewhere in the system or a failure of the expansion valve and resulting damage to the pressure relief valve.

Does bleeding radiators increase pressure?

Bleeding radiators If you bled your radiators recently, you may have lost some pressure. That’s because, when you bleed a radiator, air is released, which lowers the pressure in your boiler system.

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

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 your installer.

Will bleeding radiators stop boiler losing pressure?

Bleeding your radiators can help to reduce the pressure load and it’s fairly easy to do. However, if you have noticed the boiler pressure is too high when the heating’s on, it does mean you need to be careful of the hot water inside the system.