What Causes Low Boiler Pressure?

Boilers serve our homes as essential installations that help provide hot water and heating throughout the household. The optimal operation of a boiler is often considered as important as ensuring your electrical wiring and plumbing is functioning correctly.

Yet even the most reliable boilers can encounter issues from time to time. This is why utilizing a boiler repair service can be so important; but as a homeowner, knowing how to identify common problems is also valuable.

To start with, understanding exactly what causes low boiler pressure is key. The boiler gauge at the front of the combi unit will showcase your current level, including safe minimum pressure levels marked in green, and a red area showcasing when the pressure is too high.

Low boiler pressure can be caused by a few things, but as combi boiler systems are a closed loop, it often means that somehow, water has escaped the system. This may denote a structural or piping leak which needs your attention. Other times, it may be because of user action, like when you bleed your radiators in order to remove the air pockets that are present.

Closed-loop combi boilers will have entrance nodes that allow you to top up the amount of water within the system to increase the pressure toward a safe and optimal operational level. This is most commonly achieved via fitting your filling loop to your mains water supply.

However, a full service and repair process applied to the boiler will help you identify any other issues and ensure the boiler operates well for years to come. At AN Heating, we’re proud to offer our clients all of that and more. Please, feel free to get in touch for a no-obligation inspection. We look forward to speaking with you.