Boiler with low pressure

A loss of water pressure is a good indicator of some common issues that arise with boilers. Low pressure is relatively easy to diagnose, as most boilers have a built-in pressure gauge. Sometimes, it is a simple fix to fix a boiler with low pressure.

Understanding water pressure

Constant water pressure is essential to the efficient functioning of your boiler system. Pressure in most modern combination boilers is maintained by cold water flowing from the water mains supply through a mechanism known as the ‘filling loop’

What causes a drop in pressure?

A number of things can cause pressure to drop. It may be that there is a leak somewhere in your boiler system. Or, if you bled your radiators recently, it may be that pressure was lost then. However, you may not be able to tell that you have a problem until you check the pressure gauge. A water leak, for instance, may be tiny and go unnoticed at first, only to develop into a larger problem down the line.

Checking your pressure gauge

Check the water pressure gauge or indicator, which is typically on the front of your boiler. For most boilers, this should be set around the 1 bar. (The position that was set when the boiler was first installed is sometimes shown by a red indicator needle.) If you have noticed repeated drops in your boiler pressure, make sure you check the gauge regularly. A drop in pressure is a good indication that there is a problem with your boiler.

How to tackle lost pressure

Each boiler will come with specific instructions about its pressure system. Check your user manual to see if you can re-pressurise your boiler yourself.

If you are in Chelsea and are having issues with your boiler call 020 7350 2511 or click hear.

1 When your boiler has no pressure Accessed online 6 April 2016 https://www.britishgas.co.uk/products-and-services/boilers-and-central-heating/tips-and-advice/boiler-has-no-pressure.html

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