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Your boiler's pressure is usually displayed on the boiler's built-in pressure gauge, and should read around the 1 bar mark when you are not running any hot water and the central heating is not turned on. Therefore, 1 bar is a low-pressure setting.
Once the boiler begins to heat water, the heated water expands and causes the pressure gauge to increase. With an in-built pressure relief valve, boilers are well-set to control these quick leaps in pressure so you don’t need to worry if the boiler shows an higher pressure than you expected when you are both using the central heating and running hot water. Once you have finished using the heating and hot water, the pressure should lower back to safe levels almost immediately.
If your boiler pressure still persists to be too high, there could be one of two issues; Either you may need to re-pressurise the expansion vessel, or you could have a fault with the filling loop. However, you will not be able to do this yourself and will need to call a Gas Safe engineer. Even though the pressure may still be irregular, the pressure relief valve should prevent the boiler from overpressurising so you will still be safe to carry on as usual as long as you are not experiencing loud, unusual noises coming your boiler and your boiler is still functioning properly.
Your boiler pressure is too low if your pressure gauge is showing that your boiler pressure is below the 1 bar mark. It’s important that you increase the boiler pressure to its normal state as soon as possible.
The boiler must be switched off and completely cool before starting to re-pressurise.
To increase the boiler pressure, you will need to find the filling loop. This is a flexible hose found underneath your boiler with a small valve at each end. Then make sure both ends of the hose are secure and tightly attached to the two valves.
By using a flat headed screwdriver, you can open the valves by their tap handles. This will then allow the cold mains water into the system, you should hear this filling up the system.
The pressure will then increase so keep a close eye on the pressure gauge until it reaches a 1.5 bar mark; you can then close off both valves, one at a time. As your boiler is now at the desired pressure, feel free to switch the boiler back on, and follow by resetting the boiler.
If you still have any concerns regarding your boiler pressure, get in touch with our experts on 0203 805 4581 .
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 5% online discount is available to domestic gas and LPG customers who receive an online quote for all boiler brands excluding the Ideal Logic HE24, HE30, HO15 & HO18 and Worcester Bosch 25i ERP, 30i ERP, 15ri & 18ri boilers which qualify for the winter bundles offer. £50 additional discount available on all like-for-like system swaps and a £100 additional discount is available on conventional to combi, and combi to conventional boiler swaps. Online discounted price is only available for the duration of the 14-day quote validity which starts from the day the quote was given. Help-Link UK Ltd include a filter as part of your quote as this is highly recommended by the boiler manufacturer as a key component in maintaining boiler health, functionality and may potentially be looked upon favourably by manufacturers when assessing warranty work. This filter can be removed at the customer's request. Quote also includes a programmable thermostat for all combi boiler installations as this is a legal requirement as part of the Boiler + legislation introduced 6th April 2018, and cannot be removed from the installation unless; it is replaced with an alternative smart thermostat; or another energy saving measure as listed in the Boiler + legislation or if a smart thermostat already exists within the property. Alternative thermostats, including smart thermostats are subject to an additional charge.
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