As a professional in the field of heating systems, I understand the importance of maintaining the correct bar pressure in a combi boiler to ensure its optimal performance and longevity. A combi boiler, short for combination boiler, is a popular choice for many households because it provides both heating and hot water without the need for a separate hot water tank.

The correct bar pressure for a combi boiler is typically around 1.5 bar, which is slightly above atmospheric pressure. This pressure is crucial for the proper functioning of the boiler. The pressure within the system is necessary for the circulation of water and to prevent air from entering the system, which can lead to corrosion and pump damage.

However, it's important to note that the exact pressure can vary depending on the specific make and model of the boiler, as well as the manufacturer's recommendations. It's always best to consult the boiler's user manual or contact the manufacturer for the precise pressure setting.

If the pressure in the system drops below 1 bar, the boiler may not ignite, as the system needs a certain amount of pressure to operate the diaphragm within the boiler's pressure relief valve. This is a safety feature designed to prevent the boiler from operating under pressure that is too low.

To maintain the correct pressure, you can use the filling loop, which is a small pipe connected to the system that allows you to add water and increase the pressure. It's a simple process, but it should be done carefully to avoid over-pressurizing the system, which can also cause damage.

Regularly checking the pressure is part of good boiler maintenance. You can do this by using the pressure gauge on the boiler itself. If the pressure is too high or too low, adjusting it is a straightforward task, but if you're unsure, it's always best to consult a qualified heating engineer.

In summary, the correct bar pressure for a combi boiler is around 1.5 bar, but it's essential to refer to the boiler's manual for the exact specification. Regular checks and adjustments are part of maintaining the boiler's efficiency and safety.

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Because there is no f & e (feed and expansion, or --header-- tank), the central heating circuit in a combi system has to be pressurised -C usually to around 1.5 bar (1? times atmospheric pressure). If the pressure drops below one bar, the boiler will not fire up.Nov 8, 2014read more >>