What should you do if your boiler’s water pressure falls too low?

We know what you’re probably thinking: you are uncertain how to tell whether your boiler’s water pressure is too low anyway. However, tell-tale signs of overly low water pressure include absent hot water and a difficulty in heating your home to the required standard.

The good news is that, often, low water pressure can be easily fixed – potentially even by yourself. Here are a few steps you should take if you suspect that low water pressure is indeed your problem.

Check that your boiler’s water pressure really is low

The water pressure is vital to your boiler’s effective operation, as it helps to keep the building warm. However, if you’re feeling chilly in your own home, how can you check that pressure?

Fortunately, it’s often a pretty simple process, as most gas boilers in UK households feature a pressure gauge built into the unit’s control panel. Typically, that gauge will constitute a circular dial marked with a green zone indicating the region of standard operating pressure.

If the needle on your gauge has fallen below 1 bar and the green zone, this indicates that, yes, the boiler’s pressure is too low. While low boiler pressure is unlikely to damage your boiler, it can adversely impact the heating system’s efficiency, so you should act quickly.

Look for a water leak

This is one of the most common culprits of low boiler pressure, and you should attempt to trace a leak by examining all of your central heating system’s accessible pipes and radiators.

Warning signs of a leak would include water on the pipework as well as other evidence of moisture, like damp patches or stains or potentially even a swollen skirting board. However, as not all of your home’s pipework is likely to be visible, you might not quite be able to conduct a thorough check yourself.

Have you bled any of your radiators recently?

Bleeding a radiator is a common way of attempting to enhance a central heating system’s performance or restore an improperly-heating radiator to full working order. However, one problem with bleeding a radiator is that it can lead your boiler pressure to drop.

This is because the bleeding process releases air that has become trapped in the radiator. Consequently, in resolving the radiator problem, you might have brought about a pressure problem.

How we can correct your boiler’s pressure 

It’s not impossible to re-pressurise a boiler on a DIY basis – and, indeed, your particular boiler manufacturer might be able to provide instructions that can help you to do this. However, not everyone is comfortable with carrying out this procedure on their own.

If you are reticent about the prospect of trying to put right your boiler’s pressure in this way, or your boiler still fails to preserve the right pressure despite your best efforts, you might need to enlist help from a heating engineer. We can have our Gas Safe registered experts visit Greater London homes to undertake any boiler servicing or boiler repair work that would be necessary.