How much does a new boiler cost

How much does a new boiler cost?

If you’re wondering how much a new boiler costs, you’re not alone — it’s the most common question homeowners ask when their boiler starts playing up.

In the UK (and across Kent), the cost of a new boiler can vary quite a bit depending on the type of installation, but most homeowners fall within a fairly predictable range.

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Average cost of a new boiler in the UK

For a typical home, you can expect:

• £2,500 – £4,000 for a straightforward boiler replacement
• £3,500 – £5,500+ for more complex installs
• £3,700 average for a standard upgrade (Energy Guide)

In some cases, costs can go higher — especially if pipework, flues, or location changes are involved — with full installs reaching £3,000 to £15,000 in extreme cases (Checkatrade)

👉 In reality, most homes in Kent sit somewhere in the £3k–£4.5k range.

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Boiler cost by type

The type of boiler you choose has a big impact on price:

• Combi boiler: £2,000 – £3,500 installed (most common) (ExpertSure™)
• System boiler: £3,000 – £4,500 installed (Energy Guide)
• Regular (heat-only): £3,200 – £5,000 installed (Energy Guide)

Combi boilers are usually the cheapest because they don’t need tanks or cylinders.

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What affects the cost of a new boiler?

This is where prices really change — and it’s why quotes can vary a lot.

1. Boiler relocation

Moving a boiler (e.g. into a loft) will increase the cost due to:

• Extra pipework
• New flue runs
• Additional labour

Even a simple move can add £500–£1,500+ to the job (ExpertSure™)

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2. Changing boiler type

Switching from:

• System → Combi
• Regular → Combi

…usually costs more due to system changes and removed components.

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3. Pipework upgrades

Upgrading gas pipes (e.g. to 22mm) or extending heating pipes will increase labour and materials.

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4. Flue changes

A new flue position or vertical flue through the roof can add cost — especially if roof work is required.

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5. Boiler brand and warranty

• Budget boilers: cheaper upfront
• Premium brands (like Worcester Bosch): higher cost but longer warranties

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A realistic example (typical Kent job)

• Like-for-like combi swap → £2,500 – £3,200
• Boiler moved to loft → £3,500 – £5,000+
• Full system change → £4,000 – £6,000+

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Is a new boiler worth it?

A modern A-rated boiler can save up to £500 per year on energy bills (Energy Guide)

So while the upfront cost can feel high, it often pays back over time.

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Final thoughts

So, how much does a new boiler cost?

👉 Most homeowners in Kent will pay between £3,000 and £4,500 for a new boiler installation.

The exact price depends on your home, your current setup, and what you want to achieve.

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Need a fixed price?

The best way to get an accurate cost is with a proper quote — not a guess.

At Plumble, we provide clear, fixed-price boiler quotes with no hidden extras.