How to top up the pressure on a boiler

If your central heating is not working, it could be down to a loss of water pressure. The water pressure indicator on the front of your boiler should read between one and two bars of atmospheric pressure. If it is below one, then your boiler pressure is too low.

To top up your system and increase the pressure, you will need to locate your filling loop. This is usually a silver/grey coloured, flexible hose with a small valve at each end, and you’ll find it either underneath your boiler or nearby:

How to top up the pressure on your boiler

Often, simply topping up the pressure on your boiler will resolve issues with your central heating or hot water system. Below are a few tips to increase your boiler pressure.

• Make sure the boiler is switched off and the system is cool.
• The hose will have a valve at both ends – make sure both ends of the hose are securely attached to both valves.
• The valves can be opened either by tap handles, or by using a flat headed screwdriver.
• Open both valves to allow the cold mains water into the system.
• You should hear water filling the system.
• Keep an eye on the pressure gauge until it reaches 1.5bar, then close of both valves, one after the other.
• Once the pressure is at the required level, switch the boiler back on and (if required) reset the boiler.

In the event you are unsure about any of the above steps, please contact us us by calling us on 0161 747 7807.

You if you continue to struggle with your boiler, please report a maintenance issue.