Most boilers sit quietly until they do not. Then the choice is usually a local Gas Safe engineer you already know, a call-out network, or the manufacturer’s own out-of-guarantee repair. Several makers sell that last option as a fixed-price repair: one published fee for the visit, labour, and most boiler parts, rather than an open-ended parts-plus-time bill.
That is not the same as boiler cover (a monthly or annual plan) or an in-guarantee warranty claim. It is also not a substitute for the checks on our repairs page. Gas work in the UK still needs a Gas Safe registered engineer. If you can smell gas, hear a leak, or a carbon monoxide alarm is sounding, leave the property and call the National Gas Emergency Service on 0800 111 999.
What a manufacturer fixed-price repair is
You book the maker (or their appointed service arm), pay a published one-off fee, and their engineer attends with genuine parts. Typical extras on the official pages include a gas safety or combustion check, a short guarantee on the parts and labour they fit, and a reduced charge if the boiler cannot be repaired.
It is aimed at boilers that are out of manufacturer guarantee. If the appliance is still in warranty and the terms have been kept (annual service, Benchmark paperwork, registered installer), the repair should go through the guarantee, not a paid package. Say so when you book.
When the manufacturer cap makes sense
- The engineer already knows you need more than one major part — for example a PCB and a fan — so a time-and-parts quote will sit near or above the published cap.
- You want genuine OEM parts and the maker’s own short repair warranty (often 12 months on parts and 90 days on labour; Intergas states one year on parts and workmanship).
- You would rather a factory-trained engineer who stocks that brand than a generalist who has to order the part.
- The boiler is old enough to be out of guarantee, but not so far gone that the maker will call it beyond economical repair and only charge a diagnosis fee.
A local independent is still often the better buy for a single cheap part, a condensate freeze, a filling-loop or pressure top-up, or a fault that turns out not to be the boiler. Get a written quote from both routes before you pay the manufacturer fee — those fees are usually taken at booking.
Typical exclusions
Each brand writes its own list. Read the live page and the service schedule before you pay. Common themes on the official documents we checked in October 2026:
- Vaillant — heat exchanger and expansion vessel are excluded from the fixed-price parts list. If they cannot repair it, they charge only the fixed engineer time (£99 on the current page).
- Worcester Bosch — labour, VAT and most parts on the boiler and Worcester controls; a significant or structural part (they give shell, tank or back plate as examples), or a beyond-economical-repair decision, is re-quoted on the day. The 22 January 2026 service schedule also limits the visit to three major components and excludes heat banks, slave tanks and superstructure.
- Baxi, Main and Potterton — one-off repair is call-out, parts, labour and VAT. If they cannot fix it they keep a £90 inspection fee and refund the rest. The published page does not list a heat-exchanger exclusion the way Vaillant does; confirm in the booking terms.
- Intergas — labour and boiler parts on a fixed charge. If the fault is not the boiler they keep a call-out fee and refund the rest.
- Glow-worm (Vaillant Group) — if it is uneconomical they charge £99 for engineer time. The public repair page does not publish a heat-exchanger exclusion.
- Ideal — T&Cs treat beyond-economical-repair and similar no-repair outcomes as a partial refund, keeping the call-out and inspection element.
Scale, sludge, hidden pipework, flues, third-party controls, and the rest of the heating system are routinely outside a boiler-only package. That is why a manufacturer visit is not a system flush or a landlord safety certificate.
Independent quotes, without stale pound figures
The hub page used a 2017-ish parts table (pressure sensor about £20, fan £150, PCB £200, labour £80). Those numbers are not safe to republish. Trade part prices, VAT, and call-out rates move with the region and the brand. Treat the comparison below as a decision aid, dated October 2026, not a price list.
| Kind of job | Usually cheaper locally | When the manufacturer cap can win |
|---|---|---|
| No parts, or a small sensor / PRV / condensate job | Yes — one visit, cheap parts | Rarely; the published cap is built for a bigger repair |
| One major part (fan, PCB, or pump) | Often, if the engineer stocks or can source the part | If the OEM part plus labour lands near the cap, or you want the maker’s repair warranty |
| Two or more major parts on the same visit | Only if their written quote still undercuts the cap | Usually — this is what the packages are for |
| Heat exchanger, expansion vessel, or a structural shell / tank | Get both quotes; some maker packages exclude these | Only if that brand’s live terms actually include the part |
Ask any independent for a Gas Safe registration number, a written parts-and-labour figure, and whether the parts are genuine OEM. A cheaper pattern-part can look attractive and still leave you without the maker’s repair warranty.
Manufacturer offers (checked 5 October 2026)
Fees change. If a figure below no longer matches the official page, trust the manufacturer and still use their link. VAT is shown here only where the source page or T&Cs state it.
| Brand | Published one-off fee | Book / call | What they say is in or out |
|---|---|---|---|
| Vaillant | £399 inc VAT (was £299 on the hub) | Boiler care: repairs and servicing. Book via myVaillant Web. In-guarantee: 0330 100 3150. Questions: 0330 102 8573. | Most parts except heat exchanger and expansion vessel. Gas safety check. Parts 12 months, labour 90 days. Cannot repair: £99 engineer time. |
| Worcester Bosch | From £381 inc VAT for a standard wall-mounted boiler (15 years or older £411; floor-standing from £413). Hub had £298. | Out of guarantee repair. Customer Care on the service T&Cs: 0330 123 9339. | Boiler and Worcester controls, labour, VAT, most parts. Structural parts (shell, tank, back plate) or BER re-quoted. Schedule dated 22 January 2026: up to three major components; heat bank / slave tank / superstructure excluded. |
| Baxi, Main, Potterton | From £453, including call-out, parts, labour and VAT | Baxi repairs (Main’s old repairs URL now serves this page). Book-a-repair line listed by Baxi: 0330 678 0630. | Cannot fix: £90 inspection fee, rest refunded. Parts 12 months, labour 90 days. Confirm the exact model price at booking. Hub “variable” / 0344 871 1570 is out of date. |
| Intergas | Fixed price, but no figure on the public page — check the current price with Intergas | Book a repair or 01527 888000 (Mon–Fri 8am–5pm, Sat 9am–12pm). Email [email protected]. | Labour and boiler parts. Parts and workmanship one year. Return visit free within 30 days if the product was not successfully repaired. Non-boiler fault: call-out kept, rest refunded. |
| Viessmann | £372 for Vitodens 025-W / 050-W / 100-W / 111-W; £426 for Vitodens 200-W / 222-F up to 35 kW. Confirm whether VAT is included when you book — the table does not say. | Book a product service or repair (replaces the old /boiler-service.html hub link). Customer Service on their callout T&Cs: 01952 675000. | Repair of the original fault guaranteed 30 days; fitted parts 12 months on the T&Cs we read. They also sell a repair-plus-service bundle. |
| Glow-worm | £439 one-off inc VAT on the offer block. An FAQ on the same page still says “average cost is £365” — confirm the live booking figure. | One-off boiler repair. Support: 0330 100 3142. In-guarantee: 0330 100 3150. | Gas safety check. Genuine Glow-worm parts. Parts 12 months, labour 90 days. Uneconomical: £99 engineer time. Vaillant Group engineers. |
| Ideal | £359. T&Cs dated 17 July 2026 say that figure includes VAT (£99 inspection + £260 repair). The marketing page was last marked May 2025 — confirm when you book. | Out of warranty protection or 01482 498660. | All required boiler parts plus labour. Cannot repair: partial refund, inspection element kept. 30-day repair warranty; 12 months parts-only on parts used. |
Alpha Heating Innovation publishes BoilerCare plans and a warranty helpline, not a one-off fixed-price repair tariff we could verify. Use their own support pages rather than inventing a fee.
VAT, booking, and “Repair & Care”
Vaillant, Worcester Bosch and Glow-worm state inc VAT on the consumer pages. Baxi says the one-off fee includes VAT. Ideal’s T&Cs say the £359 is inclusive of VAT. Intergas’s homeowner FAQ says their service appointments are inclusive of VAT; they do not print the repair figure. Viessmann’s table is silent — ask.
Several brands also sell a Repair & Care (or similar) plan through Domestic & General: you pay monthly for an initial repair plus a few months of cover, sometimes with a contribution if the boiler is written off. That is a different contract from the one-off fee. Do not mix the two prices.
Related
- Boiler repairs — what you can check first, and when to call an engineer
- Boiler cover — warranty, home insurance, self-insuring, and service plans
- Fault codes A–Z
- Combi boiler problems
- Boiler service
Guidance only, checked against official public pages on 5 October 2026. Manufacturers change fees, exclusions and phone numbers. Gas work in the UK needs a Gas Safe registered engineer. A manufacturer visit is not a reason to skip an annual service.