An annual boiler service is the most important thing you can do to keep your heating system safe, efficient, and covered under warranty. But what does it actually involve?
What a Gas Safe engineer checks
**Visual inspection.** The engineer examines the boiler casing, pipework connections, and flue terminal for any signs of damage, corrosion, or deterioration.
**Flue and combustion analysis.** The flue is tested to ensure combustion gases are being safely expelled from the property. A combustion analyser measures CO and CO₂ levels to confirm efficient, complete burning.
**Gas pressure and flow rate.** Correct gas pressure is critical for safe, efficient combustion. The engineer tests both the inlet pressure and working pressure during burner operation.
**Ignition and burner.** The ignition sequence is tested, and the burner inspected for signs of blockage or deterioration. Burner pressure is adjusted if necessary.
**Heat exchanger.** The heat exchanger is inspected and cleaned where accessible. Soot or scale build-up reduces efficiency and can lead to failure.
**Safety devices.** All safety cut-outs, thermostats, and pressure relief valves are tested to ensure they operate correctly.
**Condensate trap and pipework.** For condensing boilers, the condensate trap is inspected and cleared of any blockage. The condensate drain pipework is checked for correct fall and frost protection.
**Controls and programmer.** Room thermostats, programmers, and zone valves are checked for correct operation.
After the service
You'll receive a service report confirming all checks carried out and their results. Any recommendations for further work will be clearly explained before you commit.
Why annual servicing matters
Book your annual service with NBS Plumbing & Heating — **07507 133204**.