How much does a new combi boiler cost installed in 2026?

A new combi boiler fully installed typically costs £2,000 to £3,500 in 2026 for a straightforward like-for-like swap. If the boiler needs to be relocated or the pipework changed, expect £3,000 to £4,500. Premium brands and complex installations can push the total above £4,000.

What is the cheapest type of boiler to install?

A like-for-like combi boiler swap is usually the cheapest installation because it requires the least amount of pipework changes. Budget combi boilers from brands like Baxi or Alpha can be installed for as little as £2,000 in a straightforward swap. However, the cheapest option is not always the best value — a mid-range boiler with a longer warranty often costs less over its lifetime.

How long does a boiler installation take?

A straightforward like-for-like boiler swap takes around 1 day (6 to 8 hours). Moving the boiler to a new location, converting from one type to another, or removing a back boiler typically takes 2 to 3 days. Your installer should confirm the timeframe in their quote.

Should I get a combi or system boiler?

For most UK homes with 1 to 2 bathrooms, a combi boiler is the best choice — it is compact, efficient and heats water on demand. If your home has 2 or more bathrooms and you regularly use hot water from multiple taps at once, a system boiler with a cylinder gives better flow and pressure. See our combi boiler vs cylinder guide for a detailed comparison.

Is a new boiler worth the investment?

If your current boiler is over 12 to 15 years old, a new boiler will typically save £200 to £350 per year on gas bills by running at 90 to 94% efficiency instead of 65 to 80%. Over 10 years, that is £2,000 to £3,500 in savings — roughly the cost of the new boiler. Add in fewer repairs, a long warranty and improved reliability, and the investment usually pays for itself.

Can I get a grant for a new boiler in 2026?

The ECO4 scheme provides grants for energy-efficient heating upgrades if you are on certain benefits or have a low household income. The Boiler Upgrade Scheme offers £7,500 towards a heat pump installation but does not cover gas boilers. Some local councils in Devon also run their own energy efficiency schemes. Ask your installer to check your eligibility.

What about the 2035 gas boiler ban?

The UK government plans to ban new gas boiler installations in new-build homes from 2035, but this does not affect existing properties. You can still install a gas boiler in an existing home after 2035. If you are replacing your boiler now, a gas boiler is still a practical and cost-effective choice. Consider a hydrogen-ready model if you want future flexibility, although the hydrogen network rollout remains uncertain.

How do I choose a good boiler installer?

Always use a Gas Safe registered engineer — this is a legal requirement for any gas work. Check their Gas Safe registration number at gasregister.co.uk. Get at least three written quotes, ask about their warranty terms and whether they are accredited by the boiler manufacturer (which can extend the warranty). Read our guide to finding a good plumber for more advice.

How Much Does a New Boiler Cost in 2026? (Complete UK Price Guide)

A new boiler is one of the biggest home expenses you will face — but the price varies enormously depending on the type of boiler, the complexity of the installation and which brand you choose. This guide breaks down real 2026 costs so you can budget with confidence.

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New Boiler Prices by Type

The type of boiler you need is the single biggest factor in the total cost. Here is what each type costs to buy and install in 2026.

Combi Boiler

Heats water on demand — no separate hot water cylinder needed. The most popular choice in UK homes, ideal for small to medium properties with 1 to 2 bathrooms.

Supply only£800–£2,000

Supplied + installed£2,000–£3,500

Best forFlats, terraced houses and smaller semis

System Boiler

Works with a hot water cylinder (usually in an airing cupboard) but does not need a cold water tank in the loft. Good for homes with higher hot water demand.

Supply only£1,000–£2,500

Supplied + installed£3,000–£5,000

Best forLarger homes with 2 or more bathrooms

Regular (Heat Only) Boiler

The traditional setup with a hot water cylinder and a cold water tank in the loft. Often found in older properties and usually replaced like-for-like.

Supply only£800–£1,800

Supplied + installed£2,500–£4,000

Best forOlder homes with existing cylinder and loft tank

Not sure which type you have? Read our combi boiler vs cylinder guide.

Installation Costs by Scenario

The total cost depends on what work is involved. A straightforward swap is much cheaper than moving the boiler or converting to a different type.

Installation Scenario	Typical Cost	Timeframe
Like-for-like combi boiler swap	£2,000–£3,500	1 day
Combi boiler in a new location	£3,000–£4,500	1–2 days
System boiler with new cylinder	£3,000–£5,000	1–2 days
Regular boiler like-for-like	£2,500–£4,000	1 day
Convert regular to combi	£3,500–£5,500	2–3 days
Convert combi to system	£3,500–£5,500	2–3 days
Back boiler removal + new combi	£4,000–£6,000	2–3 days

Prices include the boiler, labour, parts and VAT. Estimates for the Exmouth and East Devon area. Get a quick estimate with our cost calculator.

What Affects the Price?

Two identical boilers can cost very different amounts to install. Here are the main factors that move the price up or down.

Boiler Location

A straightforward like-for-like swap in the same location is the cheapest option. Moving the boiler to a different room or wall requires rerouting gas, water and flue pipes, which adds £500 to £1,000 or more.

Pipework Changes

If your existing pipework is incompatible with the new boiler — common when converting from a regular to a combi — the plumber will need to cap off, reroute or replace sections. This is one of the biggest variable costs.

Boiler Brand & Output

Budget brands (Baxi, Ideal) start from around £800 supply-only. Mid-range (Worcester Bosch, Vaillant) cost £1,200 to £2,000. Premium models with longer warranties cost more upfront but may save on repairs long term. A larger output (kW) boiler for bigger homes also costs more.

System Complexity

Homes with multiple heating zones, underfloor heating, smart thermostats or megaflo cylinders require more complex installations. Each addition increases the labour time and parts cost.

Flue & Gas Route

If the flue needs to be extended, routed through a wall or fitted with a plume management kit (to prevent condensation affecting neighbours), this adds £100 to £300. Gas pipe upgrades may also be needed if the existing supply is undersized.

Access & Building Work

Difficult access — boxing in, tight cupboards, loft work — increases labour time. If the old boiler is in a kitchen cupboard that needs modifying, or a back boiler needs removing from a fireplace, expect additional costs.

Boiler Brand Comparison (Supply-Only Prices)

Here is how the most popular UK boiler brands compare on price and warranty. These are supply-only prices — installation is on top.

Brand	Price Range	Warranty	Notes
Baxi	£700–£1,200	7–10 years	Budget-friendly, widely available parts
Ideal	£750–£1,400	7–12 years	Good mid-range value, popular with installers
Worcester Bosch	£1,000–£2,200	8–12 years	Market leader, excellent reliability record
Vaillant	£1,000–£2,000	7–10 years	German engineering, very efficient models
Viessmann	£1,200–£2,200	10–12 years	Premium brand, long warranties
Alpha	£600–£1,000	5–7 years	Budget option, shorter warranty

Supply-only prices for combi boiler models. Warranty length varies by model and may require annual servicing to remain valid. Prices are estimates for 2026.

How to Save Money on a New Boiler

A new boiler is a significant investment, but there are practical ways to reduce the cost without cutting corners.

Book in Summer

Gas engineers are quietest between May and September. Many offer lower prices or faster availability during the off-season. You also avoid the risk of being without heating during winter while the work is done.

Stick with Like-for-Like

Replacing a combi with a combi in the same location avoids costly pipework changes. Converting from one boiler type to another can add £1,000 or more in labour and materials.

Get Three Quotes

Always get at least three written quotes from Gas Safe registered engineers. Compare what is included — some quotes cover thermostats, system flush and magnetic filters; others charge extra.

Consider Finance

Many installers offer 0% finance over 12 months or low-interest plans over 3 to 5 years. Some manufacturers (Worcester Bosch, Vaillant) run their own finance schemes through accredited installers.

Choose the Right Size

Do not overspend on a boiler that is too powerful for your home. A 1-bed flat does not need a 35kW combi. An oversized boiler costs more to buy, wastes energy and does not heat your home any faster.

Check for Grants

The ECO4 scheme and Boiler Upgrade Scheme may offer grants towards a new boiler or heat pump if you meet the eligibility criteria. Your installer can check whether your property qualifies.

New Boiler Cost FAQs

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Not sure if you need a new boiler? Read our boiler repair vs replacement guide. Already know you need a repair? See our boiler repair page. Wondering which type of boiler suits your home? Check our combi boiler vs cylinder comparison. For general pricing, see our plumber costs guide. Need a full system installed? See our central heating installation page. Most manufacturers require a power flush on the existing system before a new boiler is fitted, or the warranty is invalid. Make sure your installer is properly certified — read our Gas Safe certificate guide.