Boiler Servicing – What Happens During a Boiler Service?

Regular boiler servicing is essential to ensure the smooth and efficient operation of your boiler. A boiler service involves a thorough inspection and maintenance of your boiler system. This blog post will walk you through the process of a typical boiler service and explain why it is important.

Why is Boiler Servicing Important?

Boilers play a vital role in providing heat and hot water to our homes. Over time, boilers can develop faults or experience wear and tear that can affect their performance. Regular servicing helps to identify and rectify these issues before they become major problems, preventing breakdowns and costly repairs.
Furthermore, an inefficient boiler can lead to higher energy bills and increased carbon emissions. By servicing your boiler, you can ensure that it operates at its optimum efficiency, saving you money and reducing your carbon footprint.

What Happens During a Boiler Service?

A boiler service is usually carried out by a qualified heating engineer or a Gas Safe registered engineer. Here are the main steps involved in a boiler service:

1. Visual Inspection

The engineer will start by visually inspecting the boiler and its surroundings. They will check for any signs of damage, leaks, or corrosion. They will also ensure that the boiler is properly installed and that there are no obstructions in the flue or ventilation system.

2. Combustion Analysis

Next, the engineer will perform a combustion analysis to check the boiler’s efficiency and emissions. This involves measuring the levels of carbon monoxide, carbon dioxide, and oxygen in the flue gases. If the levels are outside the recommended range, adjustments may need to be made to improve efficiency and safety.

3. Cleaning and Maintenance

The engineer will then clean the boiler and its components, removing any dirt, debris, or soot that may have accumulated. They will also check and clean the burner, heat exchanger, and flue pipe. Additionally, the engineer will lubricate any moving parts and tighten any loose connections.

4. Testing and Safety Checks

The next step involves testing various components and safety features of the boiler. This includes checking the operation of the thermostat, pressure relief valve, and expansion vessel. The engineer will also test the boiler’s water pressure and ensure that the system is correctly pressurised.

5. Boiler Controls and Functionality

The engineer will then test the boiler’s controls and functionality. This includes checking the operation of the timer, thermostats, and any other controls. They will ensure that the boiler is correctly programmed and that it responds appropriately to user inputs.

6. Final Checks and Recommendations

Finally, the engineer will conduct a final inspection of the boiler and its installation. They will check for any potential issues or areas that may require attention in the future. The engineer will provide you with a detailed report of the service, highlighting any recommendations or necessary repairs.

How Often Should You Service Your Boiler?

The frequency of boiler servicing depends on various factors, including the type of boiler, its age, and the manufacturer’s recommendations. As a general guideline, it is recommended to service your boiler once a year. However, if your boiler is older or prone to issues, more frequent servicing may be required.


Regular boiler servicing is crucial to ensure the safe and efficient operation of your boiler. It helps to identify and rectify any potential issues, preventing breakdowns and costly repairs. By maintaining your boiler in good condition, you can also save money on energy bills and reduce your carbon footprint. So, don’t neglect your boiler – schedule a service today and enjoy peace of mind knowing that your heating system is in top-notch condition.