How do I top up my boiler pressure?

Topping up the pressure in your boiler is a simple and straightforward task that can help to ensure that your central heating system is working at its best. In this guide, we will explain how to top up your boiler pressure step-by-step.

Before you start, it is important to check your boiler’s instruction manual for specific guidance, as the exact process may vary depending on the model and make of your boiler. In general, however, the process of topping up the pressure in your boiler involves the following steps:

Step 1: Turn off the boiler

Before you start, it is important to switch off your boiler and wait for it to cool down. This will help to prevent any accidental burns or injuries and will also allow you to see the pressure gauge more clearly.

Step 2: Locate the filling loop

The next step is to locate the filling loop. This is a small, flexible hose that connects the mains water supply to the boiler. The filling loop may be attached to the boiler or located nearby, so it is important to check your instruction manual or speak to a qualified heating engineer if you are unsure where it is.

Step 3: Open the valves

Once you have located the filling loop, you will need to open the valves on either end of the loop. The valves may be labelled with a tap or lever symbol, and you should turn them both so that they are perpendicular to the pipe. This will allow water to flow into the system.

Step 4: Watch the pressure gauge

With the valves open, you can turn the water supply back on and watch the pressure gauge on your boiler. The gauge will typically be located on the front of the boiler and will show the current pressure in the system.

Step 5: Increase the pressure

If the pressure gauge is showing a pressure that is below the recommended range (usually between 1 and 1.5 bar), you can increase the pressure by opening the valve on the filling loop. This will allow water to flow into the system, increasing the pressure.

You should only fill the system to the recommended pressure range, and it is important to check the pressure gauge regularly to avoid overfilling the system. Once the pressure is at the desired level, you can close the valve on the filling loop and turn off the water supply.

Step 6: Close the valves

Finally, you should close the valves on either end of the filling loop. Make sure that they are turned off completely so that water does not continue to flow into the system.

With these simple steps, you can top up the pressure in your boiler and ensure that your central heating system is working at its best. It is important to check your boiler’s instruction manual for specific guidance and to speak to a qualified heating engineer if you are unsure about any aspect of the process.