Maintenance
Why An Annual Boiler Service Actually Matters
Reviewed by our Gas Safe registered engineers · Last updated 21 July 2026
It’s easy to skip a boiler service when nothing seems wrong — but that’s exactly the point of one. Servicing catches the small issues that lead to bigger, more expensive ones, and keeps your warranty valid along the way.
Quick Summary
Most boilers should be serviced once a year. Skipping services can void your warranty and lets small issues develop into costly breakdowns.
Due a service? Call 020 7108 6322 or book online in under a minute.
Engineer Advice
Why annual, specifically
A year gives enough time for meaningful wear — scale build-up, seal degradation, minor component drift — to develop without letting it progress into a genuine failure.
It also aligns with most manufacturer warranty requirements, which typically specify annual servicing by a qualified engineer as a condition of keeping the warranty valid. Missing a service can, in some cases, void it entirely, leaving you liable for the full cost of a repair that would otherwise have been covered.
Keeps warranty valid
Most manufacturers require annual servicing as a condition of cover.
Catches issues early
Small faults are found before they turn into an expensive breakdown.
Improves efficiency
Scale, minor faults and incorrect settings that waste energy get addressed.
Keeps it safe
A Gas Safe engineer confirms the appliance is operating safely.
Costs
Cost of servicing vs cost of skipping it
| Scenario | Typical cost |
|---|---|
| Annual service | £70–£120 |
| Void warranty repair (missed service) | Full parts + labour, potentially £200–£800+ |
| Emergency breakdown callout | Often higher than a scheduled visit |
Best time to book
Late summer or early autumn is popular — just before the heating season ramps up. Any time that keeps you on a roughly 12-month cycle works fine.
Good practice
- Any Gas Safe engineer can service it
- Keep the paperwork accessible
- Store it with your Gas Safety Certificate
- You may need it for a warranty claim
A service and a safety check aren't the same thing
These get confused constantly, and the difference matters.
A service is maintenance. The engineer checks the appliance is working correctly and efficiently — combustion readings, seals, pressures, cleaning components, and identifying wear before it becomes a fault.
A Landlord Gas Safety Check (CP12) is a legal inspection. It confirms the appliance is safe at that moment in time. It is not maintenance, and it will not extend the life of your boiler.
A CP12 does not include a service, and a service does not produce a CP12. If you let out a property, you generally need both.
If you let out a property
- Every gas appliance and flue must be safety checked every 12 months by a Gas Safe registered engineer
- You must give existing tenants a copy of the record within 28 days of the check
- New tenants must receive a copy at the start of the tenancy
- Records must be kept for at least two years
Servicing itself isn’t a legal requirement in the way the safety check is — but manufacturer warranties almost always require it, so skipping it can leave you paying for a repair that would otherwise have been covered.
Book your annual boiler service
Gas Safe registered engineers across North London. Upfront pricing, no surprises.
FAQs
Annual servicing — your questions answered
Does missing a service by a month or so genuinely void a warranty?
Policies vary by manufacturer, but most allow a reasonable window around the anniversary date rather than an exact deadline — check your specific warranty terms, and don’t leave it much longer than necessary regardless.
If I’ve missed a service for a year or two, is it worth booking one now?
Yes, absolutely — even if warranty implications have already occurred, an overdue service still identifies and addresses any developing issues before they become a breakdown.
Does it need to be the original installer, or can I choose who services it?
You can generally choose any Gas Safe registered engineer for servicing, provided they’re competent on your specific boiler type — it doesn’t need to be the original installer, though keep proper service records regardless of who carries it out.
Does servicing improve efficiency, or is it purely about safety and reliability?
Both — a well-serviced boiler typically runs more efficiently, since scale, minor faults and incorrect settings that reduce efficiency are identified and addressed as part of the visit.
Is there a best time of year to book an annual service?
Late summer or early autumn is popular, just before the heating season ramps up, though any time that keeps you on a roughly 12-month cycle works fine.
What should I do with the paperwork after a service?
Keep it somewhere accessible, along with your Gas Safety Certificate if applicable — you may need to show a service history if making a warranty claim or when selling the property.
Will a home cover plan carry out a full service, or just a basic check?
This varies a lot between providers, so it’s worth asking exactly what’s included before assuming it matches a full manufacturer-standard service. Some cover plans bundle in a proper annual service, while others only include fault call-outs — checking the specifics avoids an unpleasant surprise if a warranty claim is ever questioned.
Does a new boiler still need its first service after just one year?
Yes, a new boiler still benefits from its first annual service on schedule, even though it’s unlikely to have developed faults yet — the visit also confirms the installation is performing correctly and keeps the manufacturer warranty on track from day one.
Related boiler service guides
We provide annual servicing across Tower Hamlets, Newham and Hackney, and the rest of our coverage area.
Due a boiler service?
Book now and keep your warranty valid.
Gas Safe Registered 918817 | North London specialists | Upfront pricing | Fully insured