How Long Does a Boiler Service Take?

How Long to Allow for a Boiler Service

A thorough annual boiler service typically takes 30 to 60 minutes for a standard combi boiler. System and conventional boilers take slightly longer — up to 90 minutes — due to additional components.

What Happens During the Service?

A Gas Safe engineer will carry out a systematic inspection covering:

• Visual check of the boiler casing, flue, and pipework
• Gas pressure and flow tests
• Combustion efficiency analysis using a flue gas analyser
• Testing of controls, safety devices, and thermostat
• Cleaning of the burner and heat exchanger if accessible
• Condensate and drainage check

If any issues are found during the service, the engineer will explain them clearly and provide a written quote before carrying out any additional work.

How to Prepare for Your Service Visit

• Ensure the engineer has clear access to the boiler — move any storage from in front of it
• Know where your boiler manual is (especially if it's a relatively new boiler)
• Note down any issues you've noticed: strange noises, pressure drops, slow heating
• Ensure someone over 18 is present for the duration of the visit

How Often Should a Boiler Be Serviced?

Once per year — ideally before the heating season starts in autumn. Annual servicing maintains your manufacturer's warranty, keeps your boiler running safely, and typically pays for itself through improved efficiency.