What Does a Boiler Service Include

A boiler service includes a visual inspection, internal components check, flue terminal inspection, gas pressure and flow check, and a controls test, all carried out by a Gas Safe registered engineer to keep your boiler running safely and efficiently.

A boiler service is one of the most crucial parts to keep your home’s heating system running safely and efficiently. Failing to maintain boiler service can cause significant issues, high heating costs, and safety hazards.

In this blog, you’ll learn what is included in a boiler service, the checklist, and what to expect once the engineer has finished.

What is a Boiler Service?

Wall mounted combi boiler in home

 

A boiler service is an annual boiler health check, that is always carried out by a Gas Safe Registered Engineer. It is a yearly inspection to make sure every component of your boiler is working safely and effectively.

The engineer will check, clear, and test the main parts of your boiler during the visit to ensure it works safely and efficiently. While the boiler service cost varies depending on your location and boiler type, the value it provides in preventing costly breakdowns far outweighs the price.

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Boiler Service Checklist: What’s Included?

Engineer opening boiler casing

 

When a Gas Safe registered engineer arrives, they work through a structured boiler service checklist to check that your boiler is operating safely and efficiently. The exact checks carried out can vary depending on the make, model and manufacturer’s instructions.

Visual Inspection

The engineer starts with an external inspection of your boiler and installation, checking for visible signs of leaks, corrosion, damage or other issues that could affect the safe operation of your boiler.

Internal Components Check

The boiler casing is opened so the engineer can inspect the accessible internal components. Where required, relevant components such as the burner, heat exchanger and ignition components may be inspected and cleaned in accordance with the manufacturer’s instructions.

Flue and Ventilation Check

The flue is inspected to check its condition and effectiveness, and the engineer will check that the boiler has the appropriate ventilation required for safe operation.

Pipework Check

The engineer will visually inspect accessible pipework and connections associated with the boiler for signs of leaks, corrosion or damage. A full test of the gas installation pipework is not normally part of a standard boiler service unless there is a known or suspected gas escape.

Gas Pressure and Combustion Check

The engineer will check the boiler’s gas pressure and heat input where applicable and carry out a combustion analysis to confirm that the boiler is operating within the manufacturer’s specified requirements.

Safety Devices and Seals

The engineer will check the boiler’s relevant safety devices, seals and gaskets in accordance with the manufacturer’s instructions to help confirm that the boiler is safe to operate.

Condensate Trap

The condensate trap and drain will be checked for debris.

Controls and Operation Test

The engineer will test the boiler and controls to confirm that the heating and hot water are operating correctly. The engineer will also check the boiler’s operation and safety following the service.

What to Expect After a Boiler Service

Once the engineer has finished here is what to expect:

  • Confirmation from a Gas Safe registered engineer that the service has been completed.
  • The Gas Safe registered engineer makes a service report that is a written record of findings and everything checked during the visit
  • The service history of your boiler is updated to comply with manufacturer’s requirements.
  • If anything needs attention, the engineer will let you know and advise on next steps
  • If a fault is found, a boiler repair can be booked separately and if the fault is beyond economic repair, a new boiler may be recommended
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How long does a boiler service take?

A boiler service typically takes between 20 and 40 minutes. The exact time can vary depending on the boiler type, its age, and its overall condition at the time of the visit.

Conclusion

A boiler service is not something that can be ignored. Having an annual boiler service by a Gas Safe Registered engineer keeps your home safe, your heating reliable, and high energy bills. The benefits of an annual boiler service extend well beyond a single visit and pairing it with the right boiler cover keeps your heating protected all year round.

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Frequently Asked Questions

Do they check radiators during boiler service?

An annual boiler service does not include a full radiator check as standard. The engineer focuses only on the boiler, its internal components, flue, gas pressure, and controls. However, if a radiator issue is spotted during the visit, the engineer will flag it.

Is a boiler service the same as a CP12 certificate?

No. A boiler service and CP12 are not the same and need to be booked separately. A boiler service is an inspection, cleaning and testing of a boiler that is carried out by a Gas Safe Registered engineer. A CP12 is a legal gas safety certificate that is mandatory for Landlords.

What are signs my boiler needs a service?

Signs your boiler needs a service include unusual noises from boiler such as banging or kettling, a yellow or orange flame instead of blue, rising energy bills, loss of pressure, and the boiler cutting out more frequently than usual.

What is the difference between a one-off boiler service and boiler cover?

A one-off boiler service is a single visit by a Gas Safe registered engineer to inspect and service your boiler. Boiler cover is a monthly policy that includes an annual service along with boiler breakdown protection and repairs throughout the year.

At 24|7 Home Rescue, we aim to keep our blogs accurate and helpful at the time of publication. However, details such as images, services, or related information may change over time. Content is provided for general information only and should not be taken as professional advice. For appliance- or boiler-specific guidance, always refer to your manufacturer’s user manual, as controls, settings and features may vary by brand and model. For the latest updates on our services, please review our Terms & Conditions or contact us directly. 24|7 Home Rescue accepts no liability for any actions taken based on outdated or incomplete content. Our team is always happy to help with any questions.

Posted by: Martin Astley 08 September 2026