How Often Should You Service Your Boiler?

Most homeowners don’t think about their boiler until something feels “off” — slow radiators, rising heating bills, or unusual noises. At ARA Services Ltd, we recommend an annual boiler service because it keeps the system safe, efficient, and running reliably through winter.

For official guidance on boiler safety and legal responsibilities, you can also check the Gas Safe Register.

If your boiler is older than 10–12 years or repeatedly breaks down, it may be cheaper in the long run to replace it. You can check typical UK boiler replacement prices here: full 2025 boiler cost guide.

Why an Annual Boiler Service Matters

Modern boilers run efficiently only when combustion, ventilation and pressure systems are working perfectly. Over time, components wear, seals dry out, and soot buildup forces the boiler to work harder — raising bills.

A yearly service keeps warranties valid, reduces carbon monoxide risks, catches faults early and significantly cuts the chance of winter breakdowns. For CO safety advice, see the NHS carbon monoxide guidance.

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How Often Should You Service Your Boiler?

All boilers — combi, system, regular, electric, gas — should be serviced every 12 months. Manufacturers require it for warranty protection, and Gas Safe standards follow the same guidance.

• Homes: every 12 months
• Landlords: annual CP12 Gas Safety Certificate (legal requirement)
• Commercial: every 6–12 months depending on load and building type

Missing a few weeks is fine, but skipping a full year increases the risk of breakdowns — especially in older boilers.

What Engineers Check During a Proper Service

A full service takes 30–45 minutes. Here’s what our engineers check:

1. Visual inspection for leaks, corrosion or soot
2. Gas pressure & combustion tests
3. Burner cleaning if required
4. Condensate trap clean & flush
5. Expansion vessel pressure checks
6. Flue integrity & air intake safety
7. Diagnostics on sensors, wiring & safety devices

After the service, a digital or paper record is provided — useful for warranties and insurance claims.

How Servicing Saves You Money

Boilers lose efficiency when they are dirty or poorly calibrated. An annual service helps prevent:

• Higher gas usage (+5–12% per year if not serviced)
• Premature part failure (pumps, fans, sensors)
• Hidden flue or ventilation issues
• Carbon monoxide risks

A typical boiler service costs £80–£120 — considerably less than the price of avoidable repairs or winter callouts.

To see how boiler servicing compares to replacement financially, and how long boilers typically last, review guidance from the Energy Saving Trust.

If your boiler is older than 10–12 years, it may be more cost-effective to compare servicing vs replacing. See the current costs here: UK boiler replacement costs (2025).

Our Approach (Why Homeowners Choose Us)

After thousands of services across London, one thing is clear: a regularly serviced boiler is far safer, more efficient and more reliable.

Our engineers are Gas Safe registered, use genuine parts, and never rush the job. We only recommend replacement when it is the more cost-effective long-term option.

Testimonials

“Engineer was brilliant — explained everything clearly. Boiler now runs quieter and heats quicker.” — Sarah, Stratford

“ARA found an issue with my flue that another company missed. Great service.” — Daniel, Forest Gate

“Honest pricing and very tidy work. Highly recommend.” — Priya, Ilford

FAQs