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Gas boilers

How Long Do Gas Boilers Last in the UK?

Most gas boilers last 10–15 years. Some keep going much longer; others fail early. Here's what makes the difference.

3 min read · Updated October 2026

Gas boiler on a kitchen wall beside a calendar and clock showing a typical lifespan of 10–15 years

Typical lifespan

A well-maintained modern boiler typically lasts 10–15 years. Older, simpler boilers sometimes lasted longer, but they were far less efficient. Premium boilers with long warranties may last beyond 15 years.

What affects boiler life

See boiler servicing explained and power flushing explained.

  • Annual servicing
  • System cleanliness – sludge and debris damage components
  • Water quality – hard water can cause limescale
  • Correct installation and sizing
  • Quality of the boiler
  • How hard it works

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Signs of an ageing boiler

See signs you need a new boiler and boiler making noises.

  • Frequent breakdowns
  • Rising energy bills
  • Strange noises
  • Pressure problems
  • Parts becoming hard to source

Repair or replace?

If your boiler is over 12 years old and needs an expensive repair, replacement is often better value. See the cost to replace a gas boiler. Get quotes from local boiler installers.

Common questions

How long does a combi boiler last?

Typically 10–15 years with regular servicing.

Should I replace a 15-year-old boiler?

Not necessarily if it's working well, but plan for replacement and consider efficiency.

Does servicing extend boiler life?

Yes. Regular servicing helps spot problems early and keeps the boiler running efficiently.

Can a boiler last 20 years?

Some do, but efficiency and reliability usually decline.

What is the most reliable boiler brand?

Reliability depends on installation and maintenance as much as brand. Look for long warranties.

Keep reading

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Signs you need a new boiler

Boilers don't come with an expiry date, but there are clear signs that one is near the end of its working life. Spotting them early gives you time to compare quotes calmly.

Heating engineer servicing a wall-mounted gas boiler with its front cover removed in a kitchen

Boiler servicing explained

An annual boiler service keeps your heating safe, efficient and reliable – and often keeps the manufacturer's warranty valid. Here's what to expect.

Heating engineer beside a new combi boiler in a kitchen, with a price card showing £2k–£4.5k and a stack of coins

How much does it cost to replace a gas boiler in the UK?

Most homeowners pay between £2,000 and £4,500 to replace a gas boiler, including fitting. The boiler itself is only part of the bill – here's where the rest of the money goes.

Gas boiler with a shield and tick symbol and a calendar representing the warranty

Boiler warranties explained

A long warranty is a selling point for a new boiler, but it usually comes with conditions. Here's how to make sure you're covered.

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