What does a boiler service include?

29th Jan 2025 5 minute read

What Does a Boiler Service Include?

Despite them being central to each home’s hot water and heating system, more than three million UK households have never serviced their boilers. Like any hardworking appliance, it needs regular care to stay in top condition. That’s why regular boiler services are required. 

In this guide, we’ll explain everything you need to know about boiler servicing: what’s included, how much it costs, how often it should be done and why it’s essential for safety and efficiency.

Why Is a Boiler Service Important?

Booking in an annual boiler service shouldn’t be a nice-to-have, but at the top of your yearly home maintenance list. Your wallet and loved ones will appreciate it in the long run, trust us.

Here’s why it matters:

  • Safety First A boiler service checks for carbon monoxide leaks. This deadly, odourless gas results in approximately 40 deaths per year in the UK alone. A boiler service also ensures all safety mechanisms are working properly
  • Efficiency Gains Regular servicing keeps your boiler running efficiently, which helps maintain your energy bills
  • Reliability Catching small issues early can prevent inconvenient breakdowns and expensive repairs
  • Warranty Compliance Many boiler warranties require annual servicing to remain valid. Skipping it could leave you unprotected
  • Eco-Friendly Benefits An efficient boiler emits fewer carbon emissions, helping you reduce your environmental impact

How Often Should You Service Your Boiler and When?

For most homeowners in the UK, an annual service is sufficient and we’d suggest scheduling it in late summer or early autumn before the colder months arrive. However, you might need a service sooner if you notice warning signs such as:

  • Unusual noises like banging or whistling
  • Irregular heating or hot water supply
  • A sudden increase in energy bills

If you’re a landlord, it’s a legal requirement to have boilers in your rental properties serviced annually and provide tenants with a Gas Safety Certificate.

What Does a Boiler Service Include?

A gas boiler service is a thorough check performed by a qualified Gas Safe engineer. Here’s what you can expect.

1. Visual Inspection

An engineer will start by visually inspecting your boiler and its surrounding pipework for any signs of damage, corrosion or leaks.

2. Boiler Case Removal and Component Inspection

Next, they’ll remove the boiler casing to inspect key internal components, including:

  • Heat Exchangers Checking for signs of damage or scaling
  • Burners Ensuring they’re functioning properly
  • Fans Testing for smooth operation
  • Seals Checking for wear and tear to prevent any leaks

3. Flue Check

The flue is inspected to ensure harmful gases are being safely expelled. If there are blockages or leaks, they will be identified and addressed.

4. Gas Pressure and Flow Check

The gas pressure is measured to ensure it meets the manufacturer’s specifications for safe operation.

5. Combustion Analysis

Using a flue gas analyser, an engineer will test the combustion process to verify that your boiler is running efficiently and safely.

6. Cleaning and Maintenance

Essential components are cleaned to remove soot or debris buildup. Minor repairs, such as tightening loose fittings are also done at this stage.

7. Safety Device Testing

Safety features like pressure relief valves and thermostats are tested to ensure they’re working as intended.

8. Boiler Restart and Operational Testing

Your boiler will be restarted and tested to confirm it’s running smoothly and efficiently.

How Long Does a Boiler Service Take?

You can expect a typical boiler service to take between 30 and 60 minutes, depending on the boiler’s type, age, condition and location. If the engineer discovers any issues that need additional repairs, the process may take longer.

How Much Is a Boiler Service?

The cost of a boiler service in the UK typically ranges from £60 to £120. Factors that can influence the price include:

  • Location Prices may vary depending on your area in the UK
  • Boiler Type More complex systems, like combi boilers, might require more time and expertise
  • Service Provider Larger companies may charge more than independent engineers

While it’s tempting to opt for the cheapest option, ensure you’re hiring a Gas Safe registered engineer or plumbing business to guarantee a thorough and safe service. It’s also important to remember that the relatively small outlay of £60 to £120 could save you hundreds in unexpected repair bills and disruption should something go wrong.

What Should You Expect After a Boiler Service?

After the service, you’ll receive a detailed report outlining what was checked, any issues found and any repairs completed. Your newly serviced boiler will operate efficiently, provide consistent heating and give you peace of mind as you head into colder months.

Tips for Choosing a Reliable Boiler Engineer

  • Gas Safe Registration: Always check that the engineer is registered with Gas Safe, the UK’s official body for gas safety
  • Customer Reviews: Look for reviews and recommendations to ensure quality service
  • Boiler Cover Care Plans: Consider signing up for a boiler cover care plan, which often includes annual servicing and priority repair call-outs

Can You Service a Boiler Yourself?

Boiler servicing should only be performed by a qualified professional. Attempting to service your boiler yourself is dangerous and can void your warranty. However, you can handle minor maintenance tasks like checking for leaks or keeping the area around your boiler clean and clutter-free.

Get a Complete Boiler Service

Your boiler is one of the most important parts of your home, that’s why a boiler service is an essential annual task. Knowing what a Gas Certified engineer from Custom Heat will check will help you feel confident that each boiler service will set you up for the year ahead.

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