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Combi boiler installation cost guide

Although installing a replacement boiler isn’t the most exciting of home improvements, a fully functioning, energy-efficient boiler is key for your home’s central heating. In this guide, we look at the average combi boiler installation cost in the UK.

When replacing your existing boiler, it’s important to consider your current boiler system and what new system you’re looking for. A combi boiler has a lot of benefits, but you need to make sure it’s the right choice for you.

What is a combi boiler?

There are three main types of boiler in the UK: regular, system and combi. Where regular and system boilers need a hot water cylinder to store hot water, a combi boiler takes its water supply directly from the mains and produces instant hot water.

Nowadays, the majority of new boiler installations in the UK use combi boilers. That’s commonly due to their excellent energy efficiency, the convenience of having hot water at the twist of a tap, and their compact size.

How much does a combi boiler installation cost?

ItemRange - LowRange - HighAverage cost
Supply and installation of combi boiler£1,500£3,000£2,250

The average supply and installation of a combi boiler will cost £1,500 to £3,000. That said, the cost of your installation will vary on a number of factors, particularly the existing boiler system that will be replaced.

If you’re replacing a different type of boiler then your combi boiler installation will generally cost more to convert the system.

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cost of combi boiler installationFactors affecting your combi boiler installation cost

The price you’ll pay for your combi boiler installation cost will vary, depending on a number of factors. Generally speaking, the more complex the installation or the more premium the boiler, the higher the cost. The main factors affecting the cost of combi boiler installation are:

  • Type of existing boiler system
  • Make and model of a new combi boiler
  • Warranty length
  • The complexity of the installation
  • Any new pipework that needs adding
  • If the boiler needs to be moved
  • Where you live (prices for engineers in London will inevitably be higher.)

Combi boiler and radiator installation cost

If you’re looking to install a new combi boiler and you also need to replace or install a radiator system, speak to your local boiler experts for prices for doing both at the same time.

Pros and cons of installing a combi boiler

Before you rush to buy and install a combi boiler, it’s worth weighing up the advantages and drawbacks:


  • High energy efficiency
  • Lower energy bills
  • Compact size
  • Easy to install
  • Hot water on demand
  • Mains water pressure


  • Not suitable for large homes
  • Can be incompatible with old pipework
  • Not good for homes with weak water main pressure

cost of combi boiler installation

Types of combi boiler

If you’ve decided on a combi boiler, great. Now you need to decide on the type of combi boiler you want. Gas combi boilers are the most popular choice in the UK, but you also have oil, LPG and electric combi boilers.

Gas combi boilers use natural gas and are a common choice for any home that’s connected to the gas network.

Oil combi boilers are an option for homes without an existing gas connection, using an oil storage tanker located in your home instead.

LPG combi boilers use liquefied petroleum gas (or LPG for short) and have a similar setup to oil combi boilers, with a tank usually located in your garden.

Electric combi boilers function slightly differently as they heat water by passing it over a hot element instead of burning fuel.

Useful combi boiler checklist

  • Check your existing boiler system to see if it needs replacing. If necessary get a local boiler expert to do an inspection.
  • When choosing a new boiler system, research the different options to see which is the best choice for your home.
  • Contact local boiler experts for professional advice and accurate quotes.
  • Shop around for fair and competitive installation costs for your combi boiler.
  • Always hire a qualified tradesperson with experience and relevant qualifications and/or accreditations.

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