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myBoiler Installation Cost
At a Glance
- The average boiler installation cost is around £2,400 in the UK.
- It typically takes 1 day for a heating engineer to install a new boiler.
- How much a new boiler costs in the UK, the labour cost to fit a boiler, and what impacts the prices you're quoted in 2025.
- How long the job usually takes, what's involved in replacing a boiler, and additional tasks you might want to schedule for the same time.
- How to find and hire a local heating engineer.
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£2,400
Table of Contents
- How Much is a New Boiler Installation?
- What Impacts Boiler Installation Costs?
- Additional Boiler Installation Costs
- How Much to Fit a Boiler? (Labour Only)
- How Much Is a New Boiler? (Supply Only)
- Boiler Fuel Type
- Do I Need a New Boiler?
- What Are The Benefits of a New Boiler?
- What's Involved in a New Boiler Installation?
- What Qualifications Do You Need For a Boiler Installation?
- Checklist: Getting a New Boiler Installed in 2025
- FAQs
- Sources
How Much is a New Boiler Installation?
The average boiler installation cost across the UK is around £2,400. This includes the cost of a new boiler, as well as the boiler fitting cost.
Boiler replacement costs you're quoted will mainly depend on the type of boiler you're installing, whether you're moving the boiler at the same time or need new pipework, and where you're located in the UK.
Excluding supply costs, and in standard cases, you should expect the cost of boiler installation to be around £1,000. However, prices you're quoted for labour could be as low as £600 or as high as £1,700.
Gas combi boiler installation costs typically range between £1,200 and £4,000. This remains the most commonly installed type of boiler in the UK.
Homeowners who get quotes for the fitting of a mid-range gas combi boiler will land in the middle of this range — in the £1,800 to £2,800 bracket. You can replace a gas combi boiler for less than this, but only if it's a simple swap-out for a basic boiler model.
Keep reading for an overview of how much all the different types of boilers cost to install in 2025.
I'd like to have a smart, hi-tech boiler fitted. Are there any specific requirements to accommodate this type of installation?
"It all depends on the location of your gas meter and where you want to put the boiler. Also, what type of system do you have? It can depend on many factors, all new boilers are A-rated and condensing."
Boiler Installation Prices
The table below provides an overview of typical new boiler installation costs in the UK.
| Boiler Type | Average Cost (Supply + Installation) |
|---|---|
| Combi Boiler | £1,200 – £4,000 |
| System Boiler | £1,750 – £4,500 |
| Conventional Boiler | £1,100 – £3,400 |
| Electric Boiler | £2,300 – £4,600 |
| Biomass Boiler | £8,400 – £16,200 |
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What Impacts Boiler Installation Costs?
Boiler installation costs are determined by:
- The boiler's brand - Premium boiler brands like Viessmann, Vaillant, and Worcester Bosch will typically charge more than mid-range boiler brands like Baxi and Ideal.
- Your home's location - Homes in London or the surrounding areas can cost £250 to £700 more than those living in the north of the UK due to increased demand.
- Replacing boiler like-for-like - Swapping your old combi boiler for a new combi boiler will have significantly lower labour costs than if you were to change fuel type.
- Replacing boiler with a different fuel type - New pipework, fuel lines, upgrading or removing water tanks, electrical and flue work will all bump up your installation costs if you're changing your boiler's fuel type.
- National or local heating engineer - Opting for a local heating engineer will carry lower labour costs than if you were to choose a national installation company, as their overheads will be lower, saving you between £500 to £1,500 in labour costs.
Additional Boiler Installation Costs
Replacing your boiler doesn't mean you need to overhaul your home's entire heating system.
Depending on your goals, here's what you can consider:
If You Want To Protect Your System
- Add a magnetic filter to your boiler to stop future debris buildup. These cost around £120 to £250.
- Aim for an annual boiler service to detect problems early. Boiler services cost around £100.
If You Want To Boost Your Energy Efficiency
- Smart thermostats offer complete control over your home's heating via your phone, and can learn your routine to save on energy costs when you're not home. Installing a smart thermostat costs £265.
- Installing thermostatic radiator valves (TRVs) lets you set your radiators to different temperatures depending on what room they're in, so you can turn them down in rooms you don't use often to reduce your energy consumption. They typically cost around £70 to £140 per radiator.
If You Want To Upgrade Your Heating Setup
- If you've had your radiators bled and your system flushed and you're still experiencing cold spots and poor heat distribution, it's time to replace them. Radiator replacement costs £200 per radiator.
- To keep your space tidy, you may want to box in your new boiler to streamline your room. Boxing in your boiler costs £335.
How Much to Fit a Boiler? (Labour Only)
The average cost of labour when getting a new boiler installed is between £600 and £1,700.
However, these costs are dependent on the following:
- If you're having a like-for-like boiler replacement (e.g., same type of boiler, in the same location), or a new fuel type installed
- The ease of access to the current boiler position
- If you want the new boiler installed in a different location
The bottom line: the more straightforward the job, the less you'll pay in labour.
How much does a combi boiler installation cost (labour only)? Could I also get a price for replacing 11 radiators (4 doubles, supply and labour)?
"I would say roughly £400 to £800 for the boiler installation if it's a straight swap, but if it's a conversion, then it could be anything up to £1,000.
For the radiators, I would say it's a day's work (if all went well), so between £300 and £400."
For the radiators, I would say it's a day's work (if all went well), so between £300 and £400."
How Much Is a New Boiler? (Supply Only)
Boilers range in price depending on the type of boiler and the manufacturer.
| Boiler Type | Supply Cost |
|---|---|
| Combi Boiler | £600 - £2,300 |
| System Boiler | £1,150 – £2,800 |
| Conventional Boiler | £500 – £1,700 |
| Electric Boiler | £1,700 - £2,900 |
| Biomass Boiler | £7,800 - £14,500 |
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Let's look at the most common boiler types in detail:
Combi Boiler Cost
Combi boilers are one of the most popular options for new boilers in the UK. A combi boiler is efficient and compact, and takes water directly from the mains.
A combi boiler can run on either electricity or gas, and it is usually small enough to fit into a cupboard. Typically, a combi boiler costs £600 to £2,300 for supply only.
Pros
- ✔ Efficient and compact design
- ✔ Hot water on demand
- ✔ Connected to mains, so no need for a separate water tank
Cons
- ✖ Requires high water pressure
- ✖ Might not be suitable for very large homes with high demand
- ✖ Might not work if multiple showers or taps are being used at the same time
System Boiler Cost
A system boiler heats water straight from the water mains, similar to a combi boiler. This type of boiler doesn't need a water tank, and allows for more than one hot water outlet.
This also allows the system to provide hot water through multiple taps without any loss of water pressure. The supply cost of a system boiler is between £1,150 to £2,800.
Pros
- ✔ Doesn’t require a water tank
- ✔ Good water pressure
- ✔ Useful for homes with more than one bathroom
Cons
- ✖ Requires a separate hot water cylinder
- ✖ More space required compared to a combi boiler
- ✖ Hot water can run out
Conventional Boiler Cost
Conventional boilers are perfect for larger homes.
They are composed of two water cylinders – one for heating water and the other for storing the water for usage. This type of boiler is fuelled by gas or oil.
The supply cost of a conventional boiler is between £500 to £1,700.
Pros
- ✔ Great for heating larger homes
- ✔ Good water pressure
- ✔ Works well even when multiple taps are used at the same time
Cons
- ✖ Requires two water cylinders (a hot water cylinder and a cold water tank)
- ✖ Can take up a lot of room
- ✖ More disruptive and invasive to install than other boiler types
Electric Boiler Cost
An electric boiler is a great option for a new boiler as they are energy-efficient and environmentally friendly, running at almost 100% efficiency.
Electric boilers cost around £1,700 to £2,900 for supply only.
Pros
- ✔ Almost 100% efficient
- ✔ Compact design
- ✔ No flue required
Cons
- ✖ May need a hot water cylinder
- ✖ Not suitable for large households with high demand
- ✖ Running costs are typically higher than gas
Biomass Boiler Cost
A biomass boiler is an environmentally-friendly option for a new boiler.
They work by burning wood to produce the energy required to heat your water. This is usually done with wood chips, pellets, or logs.
A biomass boiler is great for the environment in comparison to other models, while also being energy efficient, potentially saving you between 30% to 50% on your energy bills.
A biomass boiler costs around £7,800 to £14,500.
Pros
- ✔ Environmentally-friendly
- ✔ Useful for off-grid homes
- ✔ Uses renewable fuel
Cons
- ✖ Expensive upfront cost
- ✖ Requires bulky water tank
- ✖ High level of maintainence required
How often should a biomass boiler be serviced?
"As manufacturer instructions recommend, every twelve months."
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Boiler Fuel Type
Let's look at the potential running costs associated with different fuel types, along with their pros and cons:
Natural Gas
Natural gas is the most common type of fuel used for boilers in the UK.
Gas running costs are around 10p per kWh (as per the 2025 Ofgem price cap).
Pros
- ✔ Cheapest fuel per unit
- ✔ Largely available throughout the UK
Cons
- ✖ Not an option for off-grid homes
- ✖ Uses fossil fuel to operate
Electricity
Electricity-fuelled boilers are less common than gas boilers, but can be useful in homes without a gas connection. They're typically noiseless, compact, and very efficient.
Electricity running costs are around 29p per kWh (as per the 2025 Ofgem price cap).
Pros
- ✔ Almost 100% efficient
- ✔ Produces heat without noise
Cons
- ✖ Much higher operational costs compared to gas
- ✖ Not an efficient option for large households
Oil
Oil boilers are commonly found in off-grid properties.
The oil is stored in a tank close to the property, and it needs to be ordered in advance.
Oil running costs are around 9p to 11p per kWh (as of 2025).
Pros
- ✔ Cheaper per kWh than electricity
- ✔ Suitable alternative for off-grid properties
Cons
- ✖ Oil needs to be ordered in advance
- ✖ A tank must be close to home for oil storage
Biomass
A biomass boiler can be heated using wood pellets, chips, or logs.
The heat from the wood is usually stored in a hot water tank for use when needed.
Biomass running costs are around 7p to 9p per kWh (as of 2025).
Pros
- ✔ A renewable, low-carbon fuel option
- ✔ Low running costs
Cons
- ✖ Requires hot water tank
- ✖ Wood-fuelled boilers are expensive upfront
Do I Need a New Boiler?
Is it time to replace your boiler?
Here are the tell-tale signs to look out for that signal your current boiler is reaching the end of its life:
Common Signs You Need a New Boiler
- Odd noises - If you're hearing popping, knocking, or hissing noises while your boiler's in use, it might be a sign that the internal components are failing.
- Frequent repairs - Your boiler should be serviced once a year, but if you're finding yourself booking additional repair services each year, it can be a sign that it needs replacing with a newer model.
- Leaking system - Repeated leaks or loss of pressure can be cause for concern and can lead to dangerous carbon monoxide leaks. These should always be investigated and, if deemed faulty, replaced as soon as possible.
- Temperature fluctuations - If you've noticed your water takes a long time to heat up or switches between hot and cold when running, it can be an indicator that something's wrong with your boiler.
- Boiler age - If your boiler is over 15 years old, it's time to replace it. Doing so can save you around £250 to £350 per year on your energy bills.
- Planning an extension - You should add a new boiler to your house extension costs if you're planning on extending your home, as your existing boiler may be too small to heat your new square footage adequately.
My water supply is hot when the tap is opened, but after a short time, the water runs cold - what's the problem?
"Sounds like your heat exchanger is blocked up, hence the problem. Best to get it checked out and replaced if advised."
What Are The Benefits of a New Boiler?
While a new boiler system might be essential if your old system is failing, it can also be a welcome upgrade if you want to trim your energy costs and have a better-optimised model.
Let's look at some new boiler benefits in more detail:
- Improved boiler efficiency - A-rated boilers can be over 90% efficient, cutting household bills by £250 to £350 per year.
- Better heating control - Modern systems allow you to set your radiators to different temperatures in each room, cutting down on wasted energy.
- Quieter boiler operation - Most modern boiler systems are designed to be very quiet.
- Smaller size - Modern boilers tend to be much smaller than older models.
What's Involved in a New Boiler Installation?
Once you've decided you need a boiler replacement and have found a heating engineer, here's what your installer will do based on the steps to install a standard gas combi boiler:
- Remove the old boiler – The time this takes will vary depending on the existing system and the complexity of the job.
- Flush and clean – Your engineer will clean and flush out your system to prevent your new boiler from being damaged by any existing debris in the system.
- Upgrade or change pipework (if required) – For example, if you're moving your boiler location, you'll need new pipework.
- Fit the new boiler – The installer will then fit your new boiler. This will either be in the same location as your old boiler or in a new location, which will take extra time to complete.
- Add protective extras – A good engineer will typically recommend having a system filter installed to protect your boiler from any sludge and debris that may build up in the system. Some other accessories that your engineer may recommend include a filling loop or a magnetic filter.
- Commission the system – Once your boiler and all accessories and pipework have been completely fitted, your engineer will then commission the system to ensure it's working correctly.
- Handover – Your engineer will then complete a handover with you. This ensures that you are as informed as possible on how to operate the boiler, how to use all of the controls, and how to do some basic maintenance checks during the lifetime of the boiler. This can include topping up the pressure and bleeding radiators.
- Register the boiler – The final step is to register your boiler with the manufacturer so that your product’s guarantee is valid. This will ensure that you are covered in the event that any problems may occur within the warranty period.
Do most heating engineers perform a power flush per standard when installing new boilers?
"Not a "Power Flush", heating engineers are required to flush the system i.e flush out all the old water and chemicals prior to installing. The difference of a "Power Flush" is that a special machine is brought in which is for more of a heavy duty flush, this enables us to clear blockages etc. within a system."
What Qualifications Do You Need For a Boiler Installation?
You shouldn't install a new boiler as a DIY project.
The consequences of poor boiler installation can be fatal, and it isn't something you should cut corners with.
You need to hire a heating engineer who is qualified to work with the type of boiler you're looking to get installed.
Depending on the type of boiler you're having installed, your heating engineer will need different certifications:
- Gas boiler installers must be Gas Safe registered, a legal requirement for anyone working with gas appliances in the UK.
- Electric boiler installers need to be qualified electricians, ideally NICEIC registered.
- Oil boiler installers must be OFTEC registered.
- Biomass boiler installers need to be HETAS registered.
Checklist: Getting a New Boiler Installed in 2025
There are a few things you will need to consider before hiring someone to install a new boiler for you - here's what we suggest:
- Gather at least 3 quotes from different heating engineers near you to compare local prices.
- Ask for an itemised breakdown of costs to see what's included, keeping an eye out for hidden costs.
- Make sure your heating engineer's qualifications match your fuel type (e.g., gas boilers need Gas Safe registered engineers by law).
- Read their customer reviews to get an idea of their work ethic.
- Be sure to ask about warranties and guarantees on their work.
FAQs
What is a combi boiler?
A combi boiler is a type of boiler that uses both gas and electricity for power and to heat the water needed for your hot water and heating system. This type of boiler is the most common type of new boiler in the UK.
What should the boiler pressure be when the heating is on?
As a general rule, your boiler pressure should be between 1 and 2 bar. However, you should read your boiler’s manual or ask for advice from your engineer if you are unsure of the required pressure for your particular boiler model.
How long does a boiler last?
The average boiler in the UK should last between 10 and 15 years before it needs to be replaced.
Sources
https://www.planningportal.co.uk/permission/common-projects/boilers-and-heating/planning-permission
https://www.directline.com/home-cover/magazine/need-a-new-boiler
https://great-home.co.uk/new-boiler-benefits
https://www.stovesonline.co.uk/arikazan-ventum-vg-log-gasification-boilers
https://www.prestige-plumbers.co.uk/a-step-by-step-guide-to-boiler-installation/
