A boiler service is a routine inspection and maintenance process carried out on a boiler system to ensure it's operating safely, efficiently, and reliably. It’s typically performed once a year by a Gas Safe registered engineer.
Safety: Detects carbon monoxide leaks or unsafe components.
Efficiency: Ensures the boiler runs optimally, saving energy and costs.
Prevention: Identifies issues before they turn into expensive repairs or breakdowns.
Warranty: Many warranties require annual servicing to remain valid.
Legal Compliance: Especially important for landlords or businesses.
What Gets Done in a Boiler Service
Here’s a breakdown of typical steps included in a full boiler service:
Visual Inspection
Check the boiler and its surroundings for leaks, corrosion, or damage.
Confirm that the boiler is installed correctly and complies with safety standards.
Internal Component Check
Remove the boiler casing to inspect and clean internal parts such as:
Burner
Heat exchanger
Spark electrode
Condensate trap
Fan and seals
Flue and Combustion Check
Ensure the flue is safely fitted and free from obstructions.
Perform a flue gas analysis using a combustion analyser to check emissions (CO, CO₂) and combustion efficiency.
Gas Pressure Check
Verify the gas pressure is correct and within manufacturer specifications.
Controls and Safety Devices Test
Check the thermostat and boiler controls are working properly.
Test safety devices like pressure relief valves and sensors.
System Checks
Ensure radiators are heating up properly.
Check for signs of sludge or debris in the system.
Sometimes a magnetic filter is cleaned (if present).
Cleaning
Clean any components that have buildup, such as the burner or condensate trap.
Report and Certification
Provide a service report or certificate outlining what was done and any issues found.
Recommend any repairs or follow-up work if needed.
How Long Does It Take?
A standard boiler service usually takes 30–60 minutes, depending on the model and condition of the boiler.