New Boiler Cost: How Much is a New Boiler in 2025?

How much is a new boiler?

A new boiler with installation will cost between £1,500 and £15,000. 

The cost is made up of two main parts: the boiler unit itself and the installation of the boiler.

Boilers cost from £500 right up to £10,000 for the boiler only, whilst installation will cost an additional £1,000 to £5,000 depending on the additional components required to complete the job.

Boilers typically last between 10 and 15 years and then they start to wear out. Breakdowns can be costly and very inconvenient as your home can be left without heating and hot water. There will come a point when your boiler becomes beyond economic repair and you need to start thinking about a new one.

In this article we break down each element of the cost to help you understand what you should expect to pay for your new boiler, how the costs are calculated and help you get an online quote.

Costs by boiler type

There are different types of boilers and the cost of each differs based on the technology.

The main boiler system types are:

• Combi boilers
• System boilers
• Conventional boilers

And across the boiler types they can be powered by different fuels:

• Gas combi boilers for mains gas.
• LPG (liquefied petroleum gas) combi boilers for houses off the main gas grid 
• Oil combi boilers utilise an oil storage tank to fuel the boiler when no mains gas connection exists
• Electric combi boilers use electricity to heat the water for the central heating and hot water system.

We will cover the costs of each of these boiler types in more detail in the next sections

Combi Boiler costs

A combi boiler costs between £500 and £3,000 for the boiler only with no installation. Combi boilers are by far the most popular boiler type as they are space saving (no hot water tank required in an airing cupboard) and provide instant heating and hot water on demand.

Cost to replace Combi boiler

A new combi boiler to replace an existing combi boiler (same location) will cost between £1,500 and £4,000 fully installed.

Other boiler system swaps for a new combi boiler incur different costs due to additional work and are covered later in this article.

Gas Combi Boiler Cost

Gas combi boilers cost from £500 to £3,500 for the boiler only, when installation is included the cost range is £1,500 to £5,000 depending on the size of the job and the capacity of the boiler required.

LPG Combi Boiler Cost

LPG combi boilers cost between £550 to £3,550 (supply only), with installation that stretches to £1,550 to £5,050. 

An LPG (Liquid Petroleum Gas) combi boiler is usually exactly the same as a Gas combi boiler all it needs to run on LPG is a conversion kit which costs about £50. LPG boilers also required a supply of LPG usually from a tank in the garden, replacing the tank would be an additional cost.

Electric Combi Boiler Cost

Electric combi boilers cost between £1,250 and £4,000 just for the boiler and are typically £3,250 to £5,750 including installation.

Electric combi boilers are less complicated than Gas boilers as there are fewer moving parts and no gas supply required, so they are usually quick and easy to repair. However they do tend to be more expensive to run.

Oil Combi Boiler Cost

Oil combi boilers cost around £2,500 to £6,000 just for the boiler which rises to £3,500 to £8,000 including installation.

Oil combi boilers tend to cost more than boilers running on other fuels as they need bespoke parts and tend to be more complicated jobs. They are only installed in properties not connected to the mains gas grid and require an oil tank to supply the oil to the boiler. 

Oil boilers do tend to be less efficient than their gas equivalents so can cost more to run. As with LPG boilers replacing the oil tank is an additional cost.

Combi Boiler Running Costs

The cost to run a combi boiler depends on a few factors

• what fuel does the boiler run on and how much does that fuel cost to heat your home
• how reliable is the brand of boiler you've chosen
• what length of warranty you get as standard / have extended
• whether you purchase boiler cover / insurance

Gas to power a Gas combi boiler will cost about £100 to £130 a month to run, whereas electricity for an electric combi boiler will cost £190 to £210 per month to run. Electric combi boilers are much more expensive to run than gas combi boilers as the cost of buying electricity is higher than gas.

Oil combi boilers are typically less efficient than a gas combi boiler and oil tends to be more expensive than gas so running an oil combi boiler typically costs between £140 to £160 a month just for oil. 

So Gas combi boilers are the cheapest to run, then oil, then electric are the most expensive of the three from a fuel perspective.

It's worth doing your research into the boiler brand and model you are purchasing to check how reliable it is and the length of warranty. Typically boilers with longer manufactuerer backed warranties are the most reliable, so even if your boiler breaks down and you have a 10 year warranty you shouldn't have to pay anything for repairs. However if you go for a budget boiler with a 2 year warranty and it breaks don in year 3 the whole bill falls on you.

Most manufacturers recommend yearly boiler servicing to keep it in good working order and to keep you warranty valid. An annual boiler service is about £65.

If your boiler is out of warranty you may want to consider boiler insurance or a boiler care plan. Depending on the level of cover you choose it will cost between £10 and £50 a month.

Regular to combi boiler conversion cost

Replacing a conventional boiler with a combi boiler costs between £2,500 to £6,000 including full installation.

Changing the type of boiler is usually more expensive than a like for like boiler type install due to additional parts being needed and more work being required so higher labour costs.

System to combi boiler conversion cost

Changing a system boiler to a combi boiler will cost about £2,500 to £6,000 fully installed.

As with the conventional boiler swap the job will cost more than replacing with the same type of boiler due to the additional work needed to complete the job.

Back boiler to combi conversion cost

Removing an old back boiler to replace with a combi boiler will cost between £2,500 to £6,000 including installation.

Since 2005 installing new back boilers has been illegal in the UK so old back boilers will need to be replaced with a different boiler type. The new combi boiler will be in a different location to the back boiler which requires additional work and parts reflected in the higher price.

System boiler costs

A new system boiler will cost around £500 to £3,000 (supply only) and £2,000 to £5,000 with full installation.

System boilers can be fuelled by gas, LPG, oil and electric. They use the mains water supply to the property rather than a cold water tank so often have strong water pressure and store hot water in a separate tank.

Conventional boiler costs

A conventional boiler costs between £500 and £3,000 (boiler only) which rises to £2,000 to £5,000 including installation.

Conventional boilers can run on mains gas, LPG or oil. They are typically found in larger, older houses due to the space they need for the cold water tank (they are gravity fed systems so the tank is usually in the loft) and and the hot water tank (usually in an airing cupboard).

Condensing boiler costs

A condensing boiler will cost from £500 to £3,000 for just the boiler itself and between £2,000 and £5,000 with installation.

All new gas boilers installed in the UK since 2005 must legally be condensing boilers. They work by having two heat exchangers rather than the one that most non-condensing boilers have, meaning they are much more efficient. 

Biomass boiler costs

A Biomass boiler costs from £7,000 to £15,000 for the boiler only and with installation £10,000 to £18,000.

Biomass boilers come in various sizes depending on the heating requirement, the larger the boiler the bigger the cost. The other key factor on the cost of the biomass boiler is whether it is an automatic or manual fuel loading boiler. Manual are, of course, cheaper but less convenient.

They are expensive to buy and install compared to gas boilers but can be cheaper to run as the fuel costs between £450 and £1,500 a year depending on the type of wood used and how much is required;

• wood pellets are between £150 and £250 per tonne

• wood chips are around £60 per tonne

• wood logs are around £125 per tonne

Pros and cons of different boiler types

Each type of boiler has it's own pros and cons and some fit better with smaller homes and less strenuous hot water requirements than others. In this next section we explore each of the main boiler types in a bit more detail.

Combi boiler pros and cons

Pros

• Space saving as no need for cold or hot water tanks
• Instant hot water on demand, no waiting for tank to heat up
• Mains pressure hot water

Cons

• Not great for multiple simultaneous showers (drop in water pressure)
• Can’t use with power showers as no storage supply of hot water to pump from
• No hot water back up (immersion heater) as no hot water tank

System boiler pros and cons

Pros

• Mains pressure hot water
• No need for a cold water tank
• Great for high simultaneous usage households
• Built in components (e.g. pumps and expansion vessels) so space saving

Cons

• Need a home for the hot water cylinder
• Not instant hot water like combi boiler

Conventional boiler pros and cons

Pros

• Great for high simultaneous usage households
• Hot water back up with immersion heater

Cons

• Needs lots of space: requires cold water and hot water tank
• No instant hot water

Condensing boiler pros and cons

Pros

• Energy saving through higher efficiency and therefore lower gas bills
• Smaller environmental impact

Cons

• May need larger pipes and radiators as they have lower operating temperatures
• By product is acidic condensate
• Cost more than non-condensing boiler on initial outlay

New Boiler Installation cost

A big proportion of the cost of a new boiler installation, other than the new boiler itself, is the labour, parts and additional items.

The installer you choose must be accredited to install your boiler, with the regulations being split by fuel type

• A gas boiler can only be installed by a Gas Safe Registered installer

• An oil boiler can only be installed by an OFTEC Registered installer

• An electric boiler can only be installed by a Microgeneration Certification Scheme (MCS) Registered installer

For all boiler types the installer also needs to be a Part P electrically qualified electrician to wire in a boiler in the UK. If your installer doesn’t have this qualification they will need to also hire an electrician to complete this part of the install.

New Boiler Installation labour cost

A boiler installer’s day rate is usually £300-£400, so the labour cost of the new boiler installation will vary depending on the amount of days needed to finish the job.

• A simple combi boiler replacement typically takes 4-6 hours costing £250 to £400 in labour

• Changing boiler type can take 2 days costing £600 to £800 in labour

• Moving the location of a boiler typically takes an extra day costing £300 to £400 in labour

• A highly complex job swapping boiler types, moving the boiler location and adding new pipework may take 5 days costing £1,500 to £2,000 in labour

What impacts the cost of a new boiler installation

The total cost of a new boiler installation depends on many things which we’ll summarise now

Grants available for new boilers

One way to help pay for your new boiler is with available government grants.

Boiler grants in England and Wales

Currently the Boiler Upgrade Scheme can offer grants to help with the cost of a new heat pump or a new biomass boiler if it is replacing a fossil fuel boiler. Available are:

• £5,000 grant towards biomass boiler costs

• £7,500 grant towards air source, ground source or water source heat pump costs

Eligibility criteria

Very simply you need to meet the follow criteria to be eligible:

• own the property

• replace fossil fuel system



• with a biomass boiler or heat pump (on or after 1st April 2022)

Boiler grants in Scotland

Scotland has two grants and interest free loans on offer from the Scottish government for energy saving such as renewable heating, central heating, insulation and draught proofing:

• Home Energy Scotland Grant and Loan

• Warmer Homes Scotland Scheme

Eligibility criteria

• home owner or renter (private rentals only)

• lived in property for last 12 months



• struggling to pay energy bills

New Boiler Cost Summary

So now you know all there is to know about new boiler costs:

• what a new boiler will copst you based on your needs and requirements

• how the different boiler types, power outputs and requirements impact the cost

• what support is available from the government to help with the costs

Now all that is next is to compare new boiler costs