Boilers are at the heart of every home’s heating system, but over time they can suffer from corrosion. This not only reduces efficiency but can also lead to costly breakdowns or the need for a full replacement if left untreated. By understanding the common causes of boiler corrosion and how to prevent it, you can extend the life of your system and keep it running smoothly.
Why Boilers Corrode and What You Can Do About It
Corrosion occurs when metal surfaces inside the boiler react with oxygen, water, or other elements, gradually weakening the system. If ignored, it can damage key components such as the heat exchanger, radiators, and pipework. Fortunately, with the right maintenance, corrosion can be controlled and often prevented.
Common Causes of Boiler Corrosion
Oxygen in the system
When air enters the heating system through leaks, poorly maintained seals, or incorrect pressure levels, oxygen reacts with metal parts. This reaction forms rust, which can spread through the boiler and radiators.
Poor water quality
Hard water or untreated water can cause scale build-up and accelerate corrosion. Over time, limescale restricts water flow and damages internal components, reducing efficiency.
Lack of inhibitor chemicals
Central heating systems rely on inhibitor solutions to protect against rust and limescale. Without these chemicals, boilers are left vulnerable to corrosion and sludge build-up.
Neglected maintenance
Skipping annual servicing means early signs of corrosion often go unnoticed. Small leaks, damaged seals, or reduced inhibitor levels can quickly turn into major problems.
How to Prevent Boiler Corrosion
Book annual servicing
Having your boiler checked every year by a Gas Safe registered engineer ensures any early signs of corrosion are spotted and treated quickly.
Use inhibitor chemicals
Adding inhibitors during installation or system flushing provides long-term protection against rust and limescale.
Power flushing the system
If sludge or scale is already present, a power flush can clean out the system and restore efficiency, preventing further corrosion.
Choose professional installation
A poorly installed boiler is more likely to suffer from air leaks or pressure issues. Always use trusted engineers to set up your system correctly.
Regular maintenance checks
Even between services, it’s wise to monitor your system for pressure drops, unusual noises, or radiator cold spots. These can indicate corrosion or blockages.
Why Prevention Matters
Corrosion can shorten the life of your boiler and increase energy bills. By keeping your system protected, you not only avoid costly repairs but also ensure your boiler runs efficiently, keeping your home warm and safe throughout the year.
Need Help with Boiler Care in Romsey or Southampton?
Pegasus Plumbers provides expert boiler services, from annual maintenance to full system flushing, helping you protect your heating from corrosion. Our qualified engineers work across Romsey and Southampton to keep homes safe, warm, and efficient. Call us today on 07584495834 or fill out our contact form to book your appointment.
