Boiler Installation Costs UK 2026
Combi, system and regular boilers compared, with realistic fitted prices.
5 min read · Updated 2026
Key takeaways
- ›A new combi boiler fitted costs £1,800–£3,500.
- ›System and regular boilers cost more, £2,500–£4,500 fitted.
- ›Gas work must be done by a Gas Safe registered engineer.
Choosing the right boiler
A combi boiler heats hot water on demand and needs no tanks — ideal for most homes with one bathroom. A system boiler uses a hot-water cylinder and suits homes with two or more bathrooms. A regular (heat-only) boiler works with a cold tank and cylinder and is often a like-for-like replacement in older properties. Switching types (for example tank to combi) adds pipework cost.
Typical price ranges (UK 2026)
- •Combi boiler (incl. fitting): £1,800–£3,500.
- •System boiler (incl. fitting): £2,500–£4,000.
- •Regular / heat-only boiler: £2,000–£3,800.
- •Changing boiler type (extra pipework): £400–£1,200 extra.
- •Magnetic filter, flue and controls often included — confirm.
Safety and warranties
Any gas boiler must be fitted by a Gas Safe registered engineer — ask to see their ID card and check the number on the Gas Safe Register. A new boiler should come with a manufacturer's warranty of 5–10 years; an annual service is usually required to keep it valid. If you are renting out the property, you must also have an annual gas safety certificate (CP12).
Frequently asked
How long does a boiler install take?
A like-for-like combi swap usually takes a day; changing boiler type can take 2 days.
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