An annual boiler service is the single cheapest way to avoid a mid-winter breakdown, keep your warranty valid and make sure your boiler is not quietly producing carbon monoxide. Call 020 7183 4810 to book a Gas Safe registered engineer across London.
Book your annual boiler service
Fixed-price servicing across Central, West and South West London, with flexible appointment times.
Need a Gas Safe engineer today?
Same day callouts across Central and West London, fixed quotes and fully guaranteed work.
Most manufacturers require an annual service to keep your boiler warranty valid — and most home insurance policies expect it too. Beyond the paperwork, a service is how faults get caught early, before they turn into a breakdown on the coldest day of the year or, in rare but serious cases, a carbon monoxide risk.
What our engineers check during a service
- Overall condition and safety of the boiler casing and flue
- Gas pressure, burner performance and combustion readings
- Carbon monoxide levels, using calibrated detection equipment
- Condensate pipe, seals and ventilation
- Controls, timers and thermostat operation
- Any visible signs of leaks, corrosion or wear
We do not walk you through how to do any of this yourself — testing combustion and carbon monoxide levels safely needs calibrated equipment and Gas Safe certification, not a guide.
Signs your boiler needs a service — not a wait
- It is due for its annual service or the certificate has expired
- You notice a yellow or orange flame instead of blue
- Unusual noises, smells or soot marks around the boiler
- Rising energy bills with no obvious explanation
- The boiler is switching off, losing pressure, or taking longer to heat up
Why we do not recommend the popular online fixes
| Common online advice | Why it falls short |
|---|---|
| “Just check the pressure gauge yourself” | Pressure is only one indicator — a full service checks combustion safety, which you cannot assess visually. |
| “Bleed the radiators and it will be fine” | This treats a symptom, not the boiler itself, and does not catch flue or combustion faults. |
| “Servicing is optional if it is working fine” | Carbon monoxide leaks are often undetectable without proper testing equipment, even when the boiler seems to run normally. |
Smell gas or suspect a carbon monoxide leak?
Turn off the gas at the emergency control valve, open windows and doors, avoid naked flames or switches, and leave the property.
Call the National Gas Emergency Service on 0800 111 999, then call us on 020 7183 4810.
What it costs to wait
Skipping a service does not save money in the long run. An unserviced boiler runs less efficiently, pushing bills up gradually, and small faults left unchecked tend to become full breakdowns — usually at the worst possible time. A missed service can also invalidate your manufacturer’s warranty, leaving you to pay full price for a repair that would otherwise have been covered.
How Olia’s Plumbing & Heating handles it
- Call 020 7183 4810 or request a call-back to book a convenient time
- A Gas Safe registered engineer carries out a full manufacturer-standard service
- You get a clear written report of what was checked and any recommendations
- If we find a fault, we quote you before any further work
Fixed pricing, fully insured engineers, and no pressure to book work you do not need.
Keep your boiler safe and covered
One annual service protects your warranty, your bills and your household.
Frequently asked questions
How often should a boiler be serviced?
Once a year, ideally before winter. This keeps most manufacturer warranties valid and catches faults early.
How much does a boiler service cost in London?
Call 020 7183 4810 for a fixed price — it depends on your boiler type and location, and we will confirm the cost before booking.
How long does a service take?
Most services take around 30-45 minutes, though this can vary depending on the boiler’s condition and age.
What happens if my boiler fails the service?
Your engineer will explain what was found and quote for any repair work needed — there is no obligation to book further work with us.
Do you service all boiler brands?
Yes, our Gas Safe registered engineers service all major boiler makes and models.
Do not wait for a breakdown to think about your boiler. Call 020 7183 4810 to book your annual service today.
Related services: Gas Safe Engineer London, Boiler Repair Central London, Landlord Gas Inspection Central London, Boiler Installation Central London
Peyman
CEO & Founder — Gas Safe Registered Engineer
Peyman is the founder of Olia's Plumbing & Heating, a London based team with over 15 years of hands on experience in boiler installation and repair, central heating, gas work and emergency plumbing. He personally oversees jobs across Central and West London and writes these guides to help homeowners understand their heating systems.
- Gas Safe Registered
- 15+ years experience
- Covering all of London
