A boiler service typically takes between 40 to 90 minutes to complete, depending on the type of boiler and its condition. For a gas boiler, which is the most common type, the service usually takes about 60 minutes. This includes thorough safety checks, cleaning of essential parts, and ensuring the boiler is running efficiently and safely. Older boilers or those with issues may take longer as more maintenance or parts replacement might be needed. Oil boiler services generally take longer, around 75 to 90 minutes, because they also require inspection of the oil tank. Proper servicing is recommended annually to maintain safety, efficiency, and warranty validity.

For modern or well-maintained boilers without problems, the service might be on the lower end of this range (30 to 60 minutes). The service is done by a qualified Gas Safe registered engineer and involves a range of checks including combustion safety, gas consumption, controls, and flue analysis. After the service, a detailed report is provided to the homeowner.

In summary, expect a standard boiler service to take about an hour, but allow up to 90 minutes especially for older or oil boilers, and always ensure the engineer is certified for safety and warranty purposes.