What Boiler Cover Doesn't Cover: Exclusions & Get-Out Clauses to Watch

What boiler cover doesn't cover: the quick list

Almost every UK boiler cover plan — whether it's regulated insurance or an unregulated service plan — excludes broadly the same core list. Exact wording and limits vary by provider and tier, so treat this as the pattern to look for, not a guarantee for any one plan.

• Pre-existing faults — anything already broken (or breaking) when you took the plan out.
• Sludge, scale and corrosion — and the power flush needed to clear them.
• Boilers with no service history — most plans require proof of annual servicing.
• "Beyond economic repair" replacement — you often get nothing, or a part-payment.
• Boilers above the age limit — often restricted from around 7 years; many providers won't take on a boiler at 15+.
• Frozen, burst pipes and resulting water damage to your home (that's typically a buildings-insurance matter).
• Accidental, deliberate or third-party damage, plus general wear and tear.
• Cosmetic damage — dents, scratches, discoloured casing.
• Parts no longer manufactured — the plan can often pay cash instead of fixing it.
• Anything outside your cover tier — radiators, pipework, flues, cylinders and controls are often extra.

If you're weighing the whole thing up, our companion guide on whether boiler cover is actually worth it runs the maths against the exclusions below. And if you're new to the product, start with what boiler cover actually is.

Pre-existing faults & the 14–30 day waiting period

You can't insure a fire that's already burning. Most plans have a no-claim window at the start — commonly 14 days, and up to 30 days on some plans — during which you can't make a claim. (This is separate from the 14-day "cooling-off" right to cancel.)

The trap is the wording. During the waiting period, any fault that "appears" is generally treated as pre-existing — i.e. assumed to have existed before you bought the plan. So a breakdown on day 9 is typically declined even if the boiler was working when you signed up.

This is also why buying cover for a unit that's already playing up rarely works. If you're in that position, read getting cover for an already-broken boiler before you pay anything.

Sludge, scale and "system not maintained" — the biggest get-out clause

This is the exclusion that catches the most people. Two things are going on, and the second is the nasty one.

First: the cost of removing sludge and scale is not covered. A power flush typically costs £300–£700 (more on a large system or in London), and you pay it yourself.

Second — the real trap: a "system not maintained" or "damage caused by sludge/scale" clause can void the whole claim, even when the sludge didn't cause the breakdown. If a Gas Safe engineer opens up a fan or pump fault but spots a sludged, untreated system, many policies let them decline on the maintenance clause alone.

No service history = declined

Most plans require your boiler to be serviced annually by a suitably qualified engineer — for a gas boiler that means a Gas Safe registered engineer — and to have been in good working order when cover started. No service records, and a claim can be refused outright — regardless of what actually broke.

An annual service is typically worth £70–£120 (a little less for some electric boilers, more for oil), so it's cheaper than a single declined repair. Keep every invoice; the service date and the engineer's details (and Gas Safe registration number) are exactly what an assessor asks for.

If your boiler has gaps in its history, you're not necessarily stuck — some providers are more relaxed. We cover the options in boiler cover with no service history.

Boiler age limits & "beyond economic repair"

Older boilers are where cover gets thin. Many plans restrict or refuse cover on boilers from around 7 years old; a large number won't take on a boiler at all beyond around 15 years.

The bigger cliff is "beyond economic repair" (BER) — when the cost to fix exceeds the boiler's value. If your boiler is declared BER, what happens varies widely by provider, but typically:

• On many plans you get nothing towards a replacement — the cover simply ends.
• Where a contribution exists, it's often a few hundred pounds — commonly in the £250–£500 region — and usually only if the boiler is under about 7 years old.
• A full free replacement is normally limited to boilers the provider installed and has covered continuously (often for around 10 years), with a minimum cover period (e.g. several months) before the replacement benefit applies.

Scenario	Typical outcome (2026, indicative — confirm with the provider)
Boiler under ~7 yrs, declared BER	Often a contribution of roughly £250–£500, or a replacement on plans that offer it
Boiler over ~7 yrs, declared BER	Often nothing, or a small reduced contribution
Provider-installed & continuously covered ~10 yrs	Possible full replacement under that specific scheme
Boiler 15+ yrs	Many providers won't cover at all

If your unit is getting on, read cover for older boilers (10, 15 & 20+ years) for what's realistically available.

Claim limits & cash caps you didn't notice

"Unlimited repairs" is usually a feature of the premium tiers. Cheaper plans cap what they'll pay, and the caps are easy to miss in the small print.

• Per-claim and per-year caps are commonly £1,000 on standard tiers and around £1,500 on premium tiers. On some basic plans the per-claim limit is just a few hundred pounds.
• Labour is sometimes capped — e.g. only the first few hours are paid, with you covering the rest.
• Callout frequency on basic plans is often limited to 2–3 callouts per year.

If your boiler needs a major part plus several hours of labour, a £1,000 cap can be reached on a single visit — and you pay the balance.

Parts no longer available / obsolete boilers

Here's a get-out almost nobody quantifies. If a part your boiler needs is discontinued and can't be sourced, many plans don't have to fix or replace your boiler — they can settle by paying a cash sum instead.

That sum is often modest, and you may be left to fund a full replacement yourself. This is one reason insurers check parts availability and condition on the first visit to an older boiler: if parts are obsolete, they can cap their exposure to a payout rather than an open-ended repair commitment.

In practice it means an old boiler can be "covered" right up to the moment it actually fails — and then the obsolete-parts clause can turn a repair claim into a small cheque. Check whether the plan promises a repair or merely a settlement when parts are unavailable.

What counts as the "system" — and what's outside it

"Boiler cover" and "central heating cover" are not the same thing, and the difference is mostly in the tier you pick. The boiler itself is usually covered; the wider system frequently isn't unless you pay more.

Commonly extra or excluded on lower tiers:

• Radiators and central-heating pipework (often a higher tier only).
• Flues and flue accessories.
• Hot water cylinders, including Megaflo / unvented cylinders.
• Underfloor heating.
• Smart thermostats and heating controls.
• The gas supply pipe into the property.

This overlap is why people get confused between boiler cover and home emergency policies — we untangle it in boiler cover vs home emergency insurance.

Frozen/burst pipes, leaks & water damage

A frozen condensate pipe — a common winter cause of a boiler locking out — is often covered, because it's part of the boiler system. That's the good news. (If your boiler has locked out in a cold snap, this is one of the few faults non-specialists are sometimes guided to thaw safely — but anything involving the gas side, burner or sealed circuit is for a Gas Safe registered engineer only.)

The limit is what happens next. If a burst or leak damages your floors, walls or belongings, that resulting water damage is typically a buildings or home insurance matter, not boiler cover. Boiler cover fixes the boiler and its pipework, not your decorating.

Frozen mains or external pipes, and damage to the fabric of your home, sit outside almost every boiler plan.

Accidental, deliberate & cosmetic damage

Boiler cover protects against mechanical and electrical breakdown — not against you, the dog, or the decorator.

• Accidental damage (e.g. a knock that cracks a casing) is generally excluded unless bought as an add-on.
• Deliberate damage or misuse, and damage from unqualified tampering, are excluded.
• Wear and tear is excluded — though the line between "wear and tear" and "breakdown" is where disputes happen.
• Cosmetic damage — dents, scratches, faded casing — is not covered.

How to avoid being declined (checklist)

Most declined claims trace back to a handful of avoidable things. Do these and you remove the provider's easiest get-outs.

• Service it every year and keep the receipts. Use a Gas Safe registered engineer for a gas boiler; dated invoices defeat the "no service history" decline.
• Fit a magnetic filter and use inhibitor. This is your evidence against the "system not maintained" / sludge clause.
• Declare the boiler's age and condition honestly when you buy — a misdeclaration can void everything.
• Read the IPID and policy document, specifically the per-claim cap, labour cap, callout limit and age rules — and whether it's FCA-regulated insurance or an unregulated service plan.
• Match the tier to your system — if you want radiators, controls or cylinders covered, pick the tier that includes them.
• Consider a no-excess boiler cover plan if you'd rather not pay per callout, and look for no-service-history plans if your records have gaps.
• Don't try to claim in the waiting period — and don't buy cover for a fault that already exists.

When you're ready to weigh tiers, caps and exclusions side by side, see how to compare the best boiler cover for 2026.

This article is general information, not financial or gas-safety advice. We compare a selected panel of providers, not the whole market, and may earn a commission if you buy through our links. Always have gas appliances checked and repaired by a Gas Safe registered engineer; in a gas emergency call 0800 111 999. Prices are indicative UK guides for 2026 — confirm current prices on the provider's own site.