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New gas boiler cost guide
by
Checkatrade

Your gas boiler breaking can be such an inconvenience as a homeowner. Or maybe your boiler is just really inefficient and needs upgrading. Whatever the issue, we’ve put together this new gas boiler cost guide to help you budget for a replacement.

Knowing the right time to replace your gas boiler is important. Too soon and you’re unnecessarily paying out the cost of a new gas boiler. Too late and you’re stuck with a broken boiler and no hot water.

Keep reading to find out more about the costs of getting a new gas boiler, and tips for knowing when you need to replace your existing gas boiler.

Type of boilerRange - Low Range - HighAverage cost
Combi boiler£1,500 £2,750£2,125
System boiler£1,600£2,900£2,250
Heat only boiler£1,800£3,200£2,500
Gas boiler installation£250£1,000£625

How much does a new gas boiler cost?

The price you pay for a new gas boiler will depend on the type of boiler you’re installing. In this guide, the prices include supply and installation by a qualified gas installation expert. Prices will also vary depending on the exact make and model of the boiler you choose, and the tradesperson who installs it.

For a new gas combi boiler the average cost is about £1,500 to £2,750. If you need a system boiler then your new gas boiler will cost from £1,600 to £2,900. For a heat only gas boiler, you’ll be looking at an average cost of £1,800 to £3,200.

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gas boiler installation costFactors affecting the cost of a new gas boiler

There are a number of factors that can influence the price you pay for installing a new gas boiler. They include:

  • Make and model of the boiler
  • Type of new boiler
  • Type of existing boiler
  • The time it takes to install the new boiler
  • The complexity of the boiler system
  • Where you live

Gas boiler installation costs

Most gas boiler experts will quote you for the combined cost of the supply and installation of your new gas boiler. However, it’s always good to know how much the installation itself costs in case you want to source the boiler separately.

A one-day installation for your gas boiler can range from £250 to £500. If it’s a two-day installation then the cost will be around £400 to £800. For more complex boiler systems it can take up to three days and the gas boiler installation can cost £600 to £1,000. Three-day boiler installations are rare but can happen so it’s good to discuss rates with the tradesperson upfront.

When do I need to replace my boiler?

Here are some simple ways to help you decide when it’s the right time to replace your boiler:

  • A qualified engineer has told you your existing boiler is beyond repair.
  • Your current boiler doesn’t offer suitable flexibility or have a thermostat.
  • You notice your energy bills increasing without using your boiler more.
  • The boiler system has a ‘dry cycle’ that wastes energy by continuing to heat your home even when it’s at the desired temperature.
  • Your boiler has a continuous pilot light (this is common on old boilers and wastes gas).
  • Your existing boiler is G-rated for energy efficiency.

If in doubt, contact your local gas boiler specialists to come and inspect your existing boiler to see if it needs replacing. Depending on the issue, your boiler may just need servicing. If so, read our dedicated cost guide on boiler servicing costs here.

Useful gas boiler checklist

  • Check your existing boiler for signs of needing to be replaced.
  • Speak to your local gas boiler experts for professional advice and accurate quotes.
  • Decide which type of boiler system you want for your new boiler.
  • Shop around for fair and competitive costs for your new gas boiler.
  • Always hire a qualified gas installation professional to carry out any work on your gas boiler system.
  • Ask for proof of their qualifications and accreditations.

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