What’s Causing Your Leaking Boiler?

Running a boiler requires regular maintenance and care for both home comfort and more importantly, safety. Some older boilers have problems that can manifest into complicated issues. A Leaking boiler indicates that an internal component, maybe a seal or valve, is broken. It can lead to corrosion and/or can cause electrical components within the boiler to short circuit. These issues can damage your boiler or potentially harm your home. We are here to get your household heating up and running in double quick time.

Why is it leaking?

Faulty pressure valve

Sometimes a faulty pressure valve can leak if the pressure is too high. The pressure should be within manufacturers guideline ranges, if not the valve may leak water to prevent a disaster. A pressure valve problem could also indicate the boiler expansion tank is filled with water.


Corrosion is also one of the most common reasons for the boiler leaks. Pipes and tanks weaken over time and cause leakage. If the corrosion is isolated to a single component then you will need to have that component replaced. However, if the corrosion is more wide-spread, your boiler engineer may advise you to replace the whole unit.


The repetitive warming and cooling within the entire system can lead to a crack or a split with time. Cracks and splits in boilers tend to be serious issues with expensive repair costs so if your boiler is relatively old, it may be worth looking at a replacement as this will give you more hot water and heat, and you will not need to have it on as much saving you £££’s.

All our engineers are Gas Safe Registered and the article above is not a definitive list of all the things that can go wrong with a boiler – every case is different. Never attempt to work on a boiler yourself, if you have any doubt whatsoever, please phone our engineers today.