UK Price Guide 2026
Boiler Install, Service & Repair Cost UK
A 2026 UK guide to all boiler costs — new combi, system and conventional installs, annual servicing, power flush and common repairs — with one instant calculator.
Heating System (Boiler, Radiators & Repair) Cost Calculator
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Estimated Price Range
£92–£135
per job · UK average
3 local pros available near you · Usually responds within 2 hours
Estimates only, based on UK market data 2026. Confirm with a local pro.
Average prices in the UK
| Type | Typical price | Notes |
|---|---|---|
| Annual boiler service / clean | £75 – £130 | Required to keep manufacturer warranty valid |
| Fault diagnosis & repair | £90 – £280 | First hour usually included |
| Power flush (full system) | £500 – £900 | 5–7 hours, removes sludge & debris |
| Magnacleanse / chemical flush | £250 – £450 | Quicker, less invasive than power flush |
| Pump / PCB replacement | £280 – £500 | Common on systems 8+ years old |
| Combi boiler (budget) | £1,800 – £2,400 | Ideal, Baxi — like-for-like swap |
| Combi boiler (mid-range) | £2,300 – £3,000 | Vaillant ecoTEC range |
| Combi boiler (premium) | £2,800 – £3,800 | Worcester Bosch Greenstar |
| System boiler | £2,400 – £3,800 | Requires unvented cylinder works |
| Conventional / regular | £2,600 – £4,200 | Tank + cylinder system |
| System → combi conversion | £2,800 – £4,500 | Includes pipework + cylinder removal |
How much does a new boiler cost in the UK?
A new combi boiler supplied and fitted in the UK typically costs £1,800–£3,800 in 2026. Budget brands like Ideal and Baxi sit at the lower end, mid-range Vaillant ecoTEC units fall in the middle, and premium Worcester Bosch Greenstar models occupy the top of the range.
System boilers cost £2,400–£3,800 because they require an unvented cylinder, while conventional (regular) boilers with a tank in the loft and hot water cylinder run £2,600–£4,200 fully fitted.
London and the South East typically add 10–20% to labour. Many UK installers offer 0% finance over 24–36 months, especially when fitting Worcester or Vaillant boilers under manufacturer-backed schemes.
What affects boiler installation prices?
The biggest cost drivers are the boiler brand and output, whether you're swapping like-for-like or relocating, and whether the system needs a power flush. Conversions from a conventional system to a combi typically add £600–£1,200 due to extra pipework and cylinder removal.
Output (kW) matters too — a 24kW combi suits a 1–2 bath flat, 30kW suits a 3-bed semi, and 35kW+ is needed for larger homes with multiple bathrooms. Higher output units cost £150–£400 more.
Building regulations now require a magnetic system filter, TRVs on every radiator and condensate disposal — most reputable installers include these, but cheap quotes sometimes leave them out.
Combi vs. system vs. conventional
A combi boiler heats water on demand and takes up the least space — ideal for flats and smaller homes. Limitation: it can only feed one shower or tap at a time at full pressure.
A system boiler stores hot water in an unvented cylinder, so multiple showers can run at once. It still doesn't need a loft tank, making it a good middle-ground for 3–4 bed family homes.
A conventional (regular) boiler uses a cold-water tank in the loft and a hot-water cylinder. Best for older properties with low mains pressure or homes that already have the pipework in place.
How to save money on a boiler install
Get at least three written quotes from Gas Safe registered engineers and check Trustpilot or Checkatrade reviews before booking. National installers (BOXT, British Gas) offer convenience but are usually £300–£800 more than reputable local Gas Safe engineers.
Time the install for spring or summer when installers are quieter — many offer 5–10% discounts during off-peak months. Always register the boiler with the manufacturer within 30 days to secure the full warranty (10–12 years on premium brands).
Frequently asked questions
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