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When the heating is off, the boiler pressure should be low. Generally speaking, the boiler pressure should be between 1 and 1.5 bar when the heating is off. This is the standard pressure setting for the majority of modern combi boilers and it is recommended to keep the pressure at this level.

If the boiler pressure is too high, it can cause a number of issues. For example, it can cause the boiler to overheat, leading to a potential safety hazard. It can also cause excessive strain on the components of the boiler, leading to premature wear and tear.

If the boiler pressure is too low, then the boiler may not be able to heat the home effectively. This can lead to an inefficient and uncomfortable home environment, as well as higher energy bills.

To ensure that the boiler pressure is at the correct level, it is important to check the pressure gauge regularly. If the pressure is too high, then it can be reduced by releasing some of the water from the system. If the pressure is too low, then it can be increased by adding some water to the system.

It is also important to ensure that the boiler pressure is checked regularly to ensure that it is at the correct level. This can be done by a qualified engineer, who can also check the system for any faults or other issues.

The boiler pressure should also be checked if the home is experiencing any issues with the heating. If the pressure is too high, then it can cause the boiler to overheat, leading to a potential safety hazard. If the pressure is too low, then the boiler may not be able to heat the home effectively.

In conclusion, the boiler pressure should be kept at a low level when the heating is off. This is the standard pressure setting for the majority of modern combi boilers and it is recommended to keep the pressure at this level. It is important to check the pressure gauge regularly to ensure that the boiler pressure is at the correct level. If the pressure is too high or too low, then it can be adjusted by releasing or adding water to the system. Finally, it is important to have the boiler pressure checked by a qualified engineer if the home is experiencing any issues with the heating.