An annual service keeps your boiler running safely, maintains your manufacturer warranty and catches small faults before they become cold-winter callouts. Gas Safe registered, £95 flat rate.
An annual boiler service is the single most effective thing you can do to prevent a breakdown. It visits the appliance while it is working, tests the components that fail quietly, and spots the marginal readings that turn into cold-morning callouts three months later. A boiler that is serviced annually is also a safer one — it is how carbon monoxide risks get caught before they become a danger.
Only a Gas Safe registered engineer may legally carry out a gas boiler service. That registration number is on the Gas Safe Register and is checkable before the appointment. The ID card is carried on every visit.
The service is priced at £95. That covers the full inspection, clean and test of the boiler, a flue gas analysis, and a written service record. If something needs attention during the visit, you are told what it is and what it will cost before any additional work goes ahead.
A thorough service goes through the whole appliance, not just the easy-to-reach parts. Here is what every visit includes.
The boiler casing, flue terminal, pipework connections and any visible signs of corrosion, leaks or heat damage are checked before the appliance is opened. The flue route is checked for correct termination and clearances.
Combustion debris builds up inside the heat exchanger and on the burner over time, reducing efficiency and potentially causing the boiler to lockout or run dangerously rich. Both are cleaned as standard.
Combustion gases are sampled and measured to confirm the boiler is burning gas correctly. An off-spec reading can indicate a burner problem, a heat exchanger crack or an air supply issue — all of which matter for safety and efficiency.
Inlet gas pressure and burner operating pressure are both tested and compared against the manufacturer specification. A pressure that has drifted outside limits often explains intermittent faults that occur only under load.
The overheat thermostat, flame failure device, pressure relief valve and any other safety devices fitted to the boiler are tested to confirm they are operating correctly. These are the components that protect you if something else goes wrong.
The condensate trap is cleaned to prevent blockages that cause lockouts, particularly in winter. System pressure, pump operation and visible pipework are also checked, and any findings are noted in the service record.
Most boiler manufacturers require annual servicing by a Gas Safe registered engineer to keep the warranty in force. Skipping even a single year can void the remaining cover, regardless of who installed the boiler. The service record provided after each visit is what the manufacturer will ask to see if you make a warranty claim.
Beyond warranty, a serviced boiler runs more efficiently. A heat exchanger clogged with combustion debris can reduce efficiency by five to ten per cent or more, which shows up directly on your gas bill. An annual service cost of £95 typically pays for itself in savings within a year.
A serviced boiler is also less likely to break down, and when it does break down, faults tend to be smaller. The components most likely to fail are tested once a year and flagged before they fail completely.
Worcester Bosch, Vaillant, Ideal, Baxi, Glow-worm, Potterton, Viessmann, Alpha, Ferroli and Ariston — covering combi, system and conventional boilers.
Older boilers and non-standard configurations are welcome. Annual servicing is available regardless of who installed the appliance.
Covering Swindon (SN1–SN6), Wroughton, Highworth, Purton, Royal Wootton Bassett and surrounding Wiltshire villages.
The honest answer is: any time is better than not at all. That said, there are practical reasons why some times work better than others.
August and September are quieter for heating engineers, which means faster appointments and more flexibility on timing. The boiler gets checked before the winter heating season begins, so any issues are sorted before they matter.
If the boiler has just been repaired, a service shortly afterwards confirms the rest of the appliance is in good order and that the repair has not introduced any secondary issues. It also resets the service record.
A service gives you a clear picture of the boiler’s condition before you take on responsibility for it. For landlords, a Gas Safety Certificate is a legal requirement every twelve months — that can be combined with the annual service in a single visit.
£95 flat rate. That covers the full inspection, clean and test, flue gas analysis and a written service record. If any additional work is identified during the visit, the cost is agreed before it goes ahead.
Most services take between 45 minutes and an hour for a standard combi or system boiler. Older or more complex systems may take longer.
Yes, for most manufacturers. Annual servicing by a Gas Safe registered engineer is a condition of the warranty on most modern boilers. The service record is what the manufacturer will ask for if you make a claim.
Once a year is the manufacturer and Gas Safe recommendation. Annual servicing keeps the warranty valid, catches problems early and maintains efficiency. Leaving a boiler unserviced for more than a year also increases the risk of a carbon monoxide fault developing undetected.
Yes, to a significant extent. A service catches worn seals, a dirty heat exchanger, a partially blocked condensate trap or a marginal gas pressure reading while the boiler is still working, before any of those things cause a breakdown.
Yes. For rental properties, the Gas Safety Certificate (CP12) and the annual boiler service can be carried out in a single visit, saving time and keeping both records current. See the landlord gas certificates page for more.
