Boiler Servicing Explained: What’s Included, How Often You Need It & Why It Matters

Your boiler is one of the most important systems in your home. It provides heating, hot water and comfort all year round – yet it’s often forgotten about until it breaks down. Regular boiler servicing is one of the simplest and most cost-effective ways to protect your home, avoid unexpected repair bills and ensure your heating system remains safe and efficient.

In this comprehensive guide, we explain what a boiler service includes, how often it should be carried out, whether it’s legally required, and why servicing plays such a vital role in boiler cover and long-term reliability. This guide is written for homeowners across Chorley, Preston, Wigan, Bolton, Blackburn and surrounding areas.

Need your boiler serviced in Preston or Chorley? Our Gas Safe engineers service gas boilers from £102 inc VAT. Book a boiler service.

What Is a Boiler Service?

A boiler service is a routine inspection and maintenance check carried out by a qualified Gas Safe registered engineer. The purpose of a service is to ensure your boiler is:

• Safe to operate
• Running efficiently
• Free from faults or early signs of wear
• Compliant with manufacturer guidelines

Unlike boiler repairs, which fix a fault after it happens, servicing is preventative maintenance. It identifies small issues early – before they escalate into breakdowns, safety risks or costly replacements.

Many homeowners assume a boiler will “let them know” when something is wrong. In reality, boilers often develop internal faults silently, which is why regular servicing is so important.

What Happens During a Boiler Service?

A professional boiler service is a detailed process. While checks vary depending on boiler type and age, a thorough service will usually include the following stages:

1. Visual Inspection

The engineer checks the boiler casing, surrounding pipework and installation area for:

• Corrosion or rust
• Water leaks
• Loose fittings
• Signs of overheating

2. Internal Component Checks

Once the casing is removed, key internal components are inspected, including:

• Burner
• Heat exchanger
• Ignition system
• Seals and gaskets

Cleaning may be carried out if debris or build-up is affecting performance.

3. Gas Pressure & Combustion Analysis

Gas pressure is tested and combustion analysed to ensure gas is burning cleanly and efficiently. Incorrect combustion can lead to:

• Increased fuel usage
• Reduced heating efficiency
• Carbon monoxide risks (see our guide to carbon monoxide warning signs)

4. Safety Control Testing

Built-in safety devices are tested to confirm they will shut the boiler down if a fault occurs.

5. Flue & Ventilation Inspection

The flue is checked to ensure fumes are safely expelled outside, and ventilation is assessed to meet safety regulations.

6. Performance & Efficiency Checks

The boiler is tested under normal conditions to assess heating output, hot water performance and overall efficiency.

How Often Should a Boiler Be Serviced in the UK?

For most households, a boiler should be serviced once every 12 months. Annual servicing is recommended by:

• Boiler manufacturers
• Gas Safe guidelines
• Warranty providers
• Boiler cover policies

Regular servicing helps maintain safety, reliability and energy efficiency year-round.

Legal Requirements for Boiler Servicing

For Homeowners

Boiler servicing is not legally required for owner-occupied homes. However, skipping servicing can result in:

• Invalidated warranties
• Higher energy bills
• Increased risk of breakdowns

For Landlords

Landlords must arrange annual gas safety checks under UK law. Many choose to combine safety checks with servicing to ensure compliance and reliability. Guidance is available from GOV.UK.

We carry out landlord gas safety checks for up to two appliances for £102 inc VAT.

Types of Boiler Servicing: What Homeowners Should Know

Combi Boiler Servicing

Focuses on hot water delivery, pressure levels and heat exchanger condition.

System Boiler Servicing

Includes checks on the hot water cylinder, expansion vessels and associated pipework.

Conventional Boiler Servicing

Older systems require additional checks on tanks, pipework and circulation.

How Much Does a Boiler Service Cost?

Prices vary between companies and depend on the type of boiler. At Deakin’s, a gas or LPG boiler service is £102 inc VAT, an oil boiler service is £240 inc VAT, and a landlord gas safety certificate (up to two appliances) is £102 inc VAT. See our boiler servicing page for details.

Boiler Servicing vs Boiler Cover

Boiler cover provides financial protection if something breaks, while servicing prevents faults developing in the first place. The two work best together, which is why all our boiler cover plans include your annual service.

Local Boiler Servicing You Can Trust

Deakin’s provides boiler servicing across Preston, Chorley, Leyland, Wigan, Bolton, Blackburn and the wider North West, from £102 inc VAT. Our Gas Safe registered engineers carry out every check described in this guide, and we’ll confirm the price before we arrive.

If your boiler is due a service, book online or call us on 01772 426 065. We’re open Monday to Friday, 8am to 5pm.