Your boiler’s paperwork is worth money: the warranty, the service record, and what quietly voids both
A ten-year boiler warranty is a four-figure asset — and it dies silently the year you skip the service. What the small print actually requires, and which papers to keep.
Checked on 22 Jul 2026
General information, not legal or tax advice.
At a glance
- Manufacturer warranties of 5–10 years are almost always conditional on an annual service — every year, no gaps
- Gas work, including servicing, must be done by a suitably registered engineer (Gas Safe in Great Britain) — a DIY or unregistered service voids cover and breaks the law
- Most warranties also require the boiler to be registered within weeks of installation — check yours was
- At claim time the manufacturer asks for the full service history, not just last year’s receipt
- A boiler service is not a gas safety check — landlords typically need both, on different clocks
A modern boiler often comes with a 7- or 10-year warranty — on paper, one of the most valuable documents in your house. A heat exchanger failure in year six is a four-figure repair that costs you nothing… if the warranty is still alive. And the small print gives it exactly one way to die quietly: the missed annual service.
What the small print actually says
The pattern is near-universal across manufacturers:
| Condition | The catch |
|---|---|
| Annual service, every year | One missed year usually voids the remaining warranty — it doesn’t pause, it dies |
| By a registered engineer | In Great Britain that means Gas Safe registered for gas boilers — which is also the law for any gas work, warranty or not |
| Boiler registered after install | Usually within ~30 days of installation; the installer often does it, but “usually” is doing a lot of work in that sentence |
| Proof on request | A claim means producing the service record for every year since install |
None of this is hidden — it’s just distributed across a benchmark booklet, an installer’s invoice and a drawer.
The paper trail that pays
When a claim happens, the manufacturer doesn’t ask whether your boiler was serviced. They ask for evidence that it was serviced every year: the service record or benchmark log with dates and the engineer’s registration number, or the invoices. The homeowner who has six years of receipts gets a free heat exchanger; the one who has four of the six gets a quote.
So the list to keep is short: the installation paperwork (with the registration confirmation), and one service record per year, forever. That’s it — but it has to be complete.
If you let the property: two different documents
Landlords sometimes believe the annual gas safety check covers this. It doesn’t — the CP12 confirms the appliance is safe; the service is the manufacturer’s maintenance, and only the service keeps the warranty alive. Different jobs, sometimes done in the same visit if you ask the engineer — which is exactly what to ask.
The longer game
A serviced boiler doesn’t just keep its warranty — it lives longer: typical gas boiler life expectancy is 10–15 years, and the annual service is the biggest single factor in reaching the right end of that range.
The whole system runs on one habit: when the engineer hands over the service record, photograph it. KeepUp files it against the boiler, keeps the history complete for the claim you hope never to make, and reminds you before next year’s service is due. It’s free for one place.
General information — warranty terms vary by manufacturer and model; your warranty booklet is the authority on yours.
Common questions
- Does missing one annual service void a boiler warranty?
- Usually yes — most manufacturer warranties require an unbroken annual service history, and a gap voids the remaining term rather than pausing it. Check your specific terms, but assume one missed year is fatal to the cover.
- Who is allowed to service a gas boiler?
- In Great Britain, only a Gas Safe registered engineer may legally work on a gas boiler — servicing included. Warranties additionally require the service to be documented, so keep the record with the engineer’s registration number.
- What paperwork do I need for a boiler warranty claim?
- The installation and registration paperwork plus a service record or invoice for every year since installation. Manufacturers ask for the full history, not just the most recent service.
- Is a boiler service the same as a landlord gas safety check?
- No. The gas safety check (CP12) is a legal safety duty for landlords; the service is the manufacturer’s maintenance that keeps the warranty valid and the boiler efficient. Many engineers will do both in one visit if asked.