Keep your heating on!
Repressurise your Boiler
At some point during your boiler’s life cycle, you will need to top it up with mains cold water. You may have noticed that your heating has become less efficient, or that the pressure gauge on your boiler turns to red.
Fortunately, topping up the pressure on a boiler is relatively simple and can be done on a DIY basis.
There are two main ways to top up your boiler, either via an external filling loop or an internal filling loop (either keyed or keyless) – both methods are demonstrated in the video.
If you are unsure of the type of filling loop you have, or if are n doubt about how to repressurise your boiler, please contact us on 0800 917 3370
External Filling Loop
If you have a system with an external filling loop, you will see two valves, one from the mains cold water, and a second that is connected to the heating system. These valves a connected to a silver braided hose.
Fully open the valve for the mains cold water, followed by the valve that connects to the heating system. Leave the valves open until the boiler pressure is indicated at just over 1 bar. Then you can close both valves.
Don’t worry if you have gone too far as you can ‘bleed’ the radiators in your home. to reduce the pressure in the system. – you may need to top it up again.
Once you are satisfied the pressure is at 1 bar, make sure both valves are in the closed position.
Keyed Internal Filling Loop
If you have this kind of system, you will have been provided with a key (you may have been given this as part of the installation, or it may be located in the flap underneath the boiler).
Then you need to find where to fit the key. This could vary depending on your boiler, but on a Worcester Bosch model, the port is located to the front, right hand side.
Align the arrow on the shaft of key with the open padlock on the port, once the key is fully engaged, turn it to the closed padlock position. Once the key is in place, open the white tap to the left of the key port slowly and watch the pressure rise. Once the pressure is at 1 bar, close the tap.
Turn the key back to the open padlock position and gently remove the key. Some water may drip out when you remove the key – this is normal.
Keyless Internal Filling Loop
The keyless filling link can be identified by a blue lever at the bottom of the boiler. To repressurise the system, simply pull down the lever until the pressure is just over 1 bar then release.
Whichever method you use to repressurise your boiler, don’t worry if you have gone too far, you can release some of the pressure by bleeding your radiators later on.
This information was taken from the Home Building Website