Why Annual Servicing Matters
A boiler service is a routine health check carried out by a Gas Safe registered engineer, covering combustion efficiency, flue integrity, gas tightness and the general condition of your boiler and controls. Most manufacturers require an annual service to keep your warranty valid, and it's also one of the simplest ways to catch a developing fault before it becomes a full breakdown in the middle of winter.
How Often Should You Service?
As a general rule, once a year is the standard recommendation for most domestic boilers, regardless of brand or age. If you're a landlord, an annual gas safety check (leading to a CP12 certificate) is a legal requirement in Scotland, not just good practice.
A newer boiler that's rarely used heavily might seem like it could skip a year, but manufacturers typically specify annual servicing as a warranty condition -- missing a service can mean a claim being refused even if the fault itself is unrelated to servicing.
What a Proper Service Should Include
- Visual inspection of the boiler casing, seals and pipework
- Combustion analysis to check the boiler is burning gas efficiently and safely
- Flue inspection to confirm exhaust gases are venting correctly
- Gas tightness testing on the supply to the boiler
- Checking the pressure relief valve, expansion vessel and system pressure
- Testing controls, thermostats and timers are functioning correctly
Signs Your Boiler Might Be Overdue
- It's been more than 12 months since the last service
- You've noticed a yellow or orange flame instead of a crisp blue one (a possible sign of incomplete combustion)
- New or unusual noises -- banging, kettling or whistling
- A rise in gas bills without a clear explanation
- Soot or staining around the boiler casing
A yellow flame in particular is worth acting on quickly, as it can indicate incomplete combustion and a risk of carbon monoxide production -- if you notice this, it's worth having the boiler checked promptly.
What Happens If You Skip a Service
Beyond the warranty risk, an unserviced boiler is more likely to develop faults that could have been caught early -- a slowly failing component, a build-up of debris in the heat exchanger, or a developing gas tightness issue. These tend to surface as a breakdown at the least convenient time, typically the coldest week of the year when engineers are busiest.
Landlords: Servicing and CP12 Are Not the Same Thing
A CP12 landlord gas safety certificate covers the legally required annual safety check on gas appliances, but it's worth combining this with a full service rather than treating them as identical -- a safety check confirms the appliance is safe to use, while a service also covers efficiency and wear items that a basic safety check may not fully address.
Frequently Asked Questions
Does a service always find something wrong?
No -- many services confirm everything is working correctly, which is exactly the point. It's a preventative check, not a sign something is necessarily broken.
Can I service my own boiler?
No -- boiler servicing must be carried out by a Gas Safe registered engineer, both for safety and to keep manufacturer warranties valid.
Book Your Service With BeSafe 24-7
Our boiler servicing and CP12 service covers everything above, carried out by Gas Safe registered engineers (930395) across Glasgow and the surrounding areas.
Book your annual service today -- call 0141 374 0545.