Annual Boiler Service: What's Included and Why It Matters

Want to keep your boiler running safely and efficiently? Here’s what you can check:

DIY Checks You Can Do

Check when it was last serviced
Look at the service sticker on your boiler or check your paperwork. It should be serviced every 12 months.

Look for warning signs
A yellow or orange flame (it should be blue), unusual smells, or strange noises all suggest it needs attention.

Check for a carbon monoxide alarm
Make sure you have a working alarm near the boiler. Test it monthly.

Look at boiler pressure
It should read between 1–1.5 bar. If it keeps dropping or rising, mention this during your service.

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What Is a Boiler Service?

An annual boiler service is a full inspection and maintenance check carried out by a Gas Safe registered engineer.
It’s not a repair – it’s preventative maintenance to keep your boiler safe, efficient, and reliable.

How long it takes: Usually 30–60 minutes, depending on your boiler type and condition.
When to book: Every 12 months from installation or the last service date. Most people book in autumn before winter demand.

What’s Included in a Service?

A proper boiler service includes several checks and tests:

• Visual inspection – Checks boiler casing, pipes, and flue for damage or leaks.

• Combustion analysis – Tests flue gases to ensure safe and efficient burning.

• Pressure and safety devices – Verifies system pressure and safety controls.

• Flame and ignition – Inspects burner and ignition components.

• Internal components – Examines heat exchanger, seals, and electrodes for wear.

• Controls testing – Tests thermostat, timer, and safety controls.

Why Annual Servicing Matters

• Safety first – Detects potential carbon monoxide risks before they become dangerous.

• Maintains warranty – Many manufacturers require annual servicing to keep the warranty valid.

• Prevents breakdowns – Catches small issues before they lead to costly failures.

• Saves money – An efficient boiler uses less energy, reducing fuel bills.

• Extends boiler life – Regular servicing can add years to your boiler’s lifespan.

• Legal requirement for landlords – Annual Gas Safety Certificates are mandatory for rental properties.

What Happens After the Service?

• Service record – You’ll receive documentation showing what was completed and any recommendations.

• Advice given – The engineer will explain any issues found and suggest next steps.

• Sticker on boiler – Confirms the service date and reminds you when the next one is due.

• Parts replacement – If parts need replacing, you’ll be advised before any work is carried out.

How Much Does It Cost?

Annual boiler servicing typically costs £70–£90, depending on:

• Boiler type (combi, system, or conventional)

• Boiler age and condition

• Location and access

Some companies also offer boiler service plans to spread costs monthly and include priority breakdown cover.

What If Issues Are Found?

• Safety issues: If the boiler is unsafe, it must be turned off until repaired.

• Advisory notes: Minor issues that should be monitored or fixed soon.

• Recommendations: Suggested improvements for efficiency or reliability.

You’ll receive clear explanations and quotes before any work is carried out — nothing happens without your approval.

Booking Your Annual Service Is Easy with Us

In London, Watford,  Hertfordshire and Middlesex locations locations