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Repressurising your boiler [Step-by-step Guide]

Ever get the feeling that your central heating system might not be as efficient as it once was? This could be a sign that your boiler needs to be re-pressurised. We know that might sound daunting, but all it takes is a few easy steps to re-pressurise your boiler and get it back operating at its best, and Chalmers Gas are here to walk you through them in our latest blog post!


1. Check your boiler pressure

Firstly, you'll need to open the front panel your boiler and check the pressure gage. If the meter reads below 1 then you know you need to re-pressurise your boiler to get it back to the safe level of between 1 and 1.5. The pressure in your heating system could drop due to many reasons, but it is likely that there may be a small hole in your system pipes. This is not a problem and re-pressuring your boiler will surely bring the efficiency back to normal.

Look at the boiler from underneath you will see two silver taps with black knobs and end caps at each end. You will need to unscrew both of these end caps. 

2. Connect filling loop

You now need to connect the filling loop between the two taps and screw on the wing nut leaving it a little bit loose. After you do this, screw the second wing nut until hand tight and go back to the first one and tighten it as much as possible.

3. Locate pressure gauge

Open the first black tap or the one of the left fully. On the front of your boiler you will need to pull down the front panel and locate the pressure gage which is the round clock with ‘bar’ written on the front. You will need to slowly open the second tap and you will hear the sound of water running and the pressure gage in the panel should begin to rise.

4. Close tap when pressure reaches 1 bar

When you reach the 1 bar of pressure you will need to fully close the second tap and then fully close the second tap. Please note that if your boiler pressure is between 1 to 1.5 bar then all is fine. If you see a pressure in excess of 2.5 bar then you will need to contact one of our local heating engineers for an emergency visit.


Contact us for all your plumbing needs in Glasgow

If by calling Chalmers Gas on 0141 374 0274 or 07580 020343 and we will be happy to help. You can also send us a message using our contact form or email us at info@chalmersgas.com and we will get back to you as soon as we can.