Updated: 19th September, 2025
New boiler cost can be a baffling topic, but our iHeat expert guide will clear things up!
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New Boiler Cost | |
|---|---|
Type of Boiler | Boiler Cost (inc. installation) |
Combi Boiler | £1,500 - £4,500 |
System Boiler | £1,750 - £4,500 |
Conventional Boiler | £1,750 - £5,000 |
Electric Boiler | £1,500 - £4,500 |
Oil Boiler | £2,200 - £5,300 |
Biomass Boiler | £8000 - £18,000 |
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Type: The cost of a new boiler can depend on what type of boiler it is, with the most popular, combi boilers, often being the cheapest to install due to their convenient, space-saving design.
Brand: With boiler brands you tend to get what you pay for, and the reputable big name brands garner slightly higher prices due to their boilers’ reliability and performance. Names such as Worcester Bosch, Vaillant and Viessmann are trusted and celebrated giants of the heating industry.
Size (kW Output): Larger homes with a greater number of water outlets such as sinks, showers and baths naturally require larger boilers with a higher kW output, and can therefore be slightly higher in price.
Complexity: Some boiler installations are straightforward, such as a direct combi to combi swap, but some are a tad more complex and require more of the engineer’s time and skill, and can in turn be slightly more costly.
Location: A big factor in boiler installation cost is the location of the property as labour rates vary across the UK, often with London being the most expensive.
Add Ons: Extras such as smart thermostats can round off a new boiler installation bundle and allow you to maximise your home’s heating.
Current Condition: pipework that is damaged, unsafe or massively outdated could hinder even a new boiler’s performance as well as being dangerous, upgrading these would add to the total.
Check out our Youtube video on new boiler costs!
New Combi Boiler Average Cost: £2,500 - £3,500
Advantages: Space-saving, energy efficient, on-demand hot water.
Combi boilers have long since been the most popular type of boiler in the UK due to the fact they conveniently ‘combine’ both a home’s central heating duties and hot water production into one compact, powerful unit.
This sleek and space-saving design removes the need for external storage tanks and cylinders, making them a fantastic choice for smaller properties or flats.
Best property match: smaller homes to medium homes, flats, properties with only one shower or bath.
Is a combi boiler the right choice for your home? If so check out our expert picks for the best combi boilers around.
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New System Boiler Average Cost: £2,200 - £3,500
Advantages: Powerful, stores hot water, great for larger spaces.
System boilers are perfect for homes with higher hot water demands, such as those with two or more bathrooms. System boilers work with a water cylinder which stores hot water to allow for high pressure service to multiple outlets at the same time.
In a system to system swap, depending on the condition of the external hot water cylinder, you may or may not need to upgrade this also, which can bump up the overall cost by £350 on average.
Best property match: Larger properties or properties with more than one bathroom.
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New Conventional Average Boiler Cost: £1,800 - £3,200
Advantages: Suited to large properties, reliable and consistent.
Conventional (heat-only or regular) boilers are very hardworking and a tad more long standing in terms of their design and function. They do however require an external hot water cylinder and cold water storage tank.
If you live in a larger home with multiple bathrooms or a generally lower water pressure, a conventional boiler could be perfect for you due to their consistency and efficiency. Conventional boiler costs can often vary depending on the current state of your existing pipework system and whether the tank or cylinder need upgrading, which can add a few hundred pounds to the total.
Best property match: Big homes with more than one bathroom or lower water pressure.
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New Electric Boiler Average Cost: £1,800 - £3,500
Advantages: Very high-efficiency, more environmentally friendly
Electric boilers are a fantastic option for larger homes, especially those without a connection to gas. New electric boilers are not only highly efficient but also considered ‘green’ due to their lack of reliance upon fossil fuels.
Often the cost of an electric boiler may be cheaper than gas due to the fact they do not require a flue or specific pipework. However, it should be noted that electricity is actually more expensive in terms of running costs compared to gas.
Best property match: Properties with no established gas connection, ‘green’ homes.
New Oil Boiler Average Cost: £2,600 - £5,200
Advantages: Great for homes that are rural or off-grid
Oil Boilers are an older type of system, strong but most commonly found in rural properties or homes that do not have an established gas connection.
Oil boilers also require an external storage tank, this along with already slightly higher installation fees can bump up the total cost over that of modern gas boilers such as combis.
Best property match: Rural or countryside homes within no gas connection.
New Biomass Boiler Average Cost: £9,000 - £15,000
Advantages: reduced carbon emissions, run on renewable energy sources.
Biomass boilers are the most eco-friendly way of heating your home and work by burning either logs or wood pellets/chips. Biomass boilers can be highly efficient also being kind to your wallet as well as the environment.
The cost of a new biomass boiler can be higher due to their larger size, complex installations and external components in order to ensure full efficiency.
Best property type: Homes that have no gas connection or are in more rural parts of the country.
There are many boiler brands on the market, all promising you the world in terms of home heating, so it can be confusing at times when it actually comes to selecting the RIGHT boiler brand for your home.
Our handy and clear boiler brand cost comparison table can help. (all prices guide only and exc. installation)
Boiler brand | Combi boiler | System boiler | Conventional boiler |
Worcester Bosch | £1,600 – £3,800 | £1,300 – £2,800 | £1,300 – £2,800 |
Vaillant | £1,600 – £4,000 | £1,300 – £2,400 | £1,300 – £2,400 |
Viessmann | £1,600 – £3,800 | £2,200 – £2,700 | £2,200 – £2,700 |
Ideal | £1,400 – £2,700 | £1,400 – £2,700 | £1,400 – £2,700 |
Alpha | £1,100 – £2,600 | £1,100 – £2,600 | £1,100 – £2,600 |
Baxi | £1,400 – £2,700 | £1,400 – £2,700 | £1,400 – £2,700 |
Check out our full expert guide on the best boiler brands and what they can do to revamp your home’s central heating.
It may be worth noting that with boiler brands you often get what you pay for, and our selection of the best boiler brands are all trusted and championed companies, whose boiler performance is excellent and their customer service is equally gleaming.
The temptation to go all out in terms of low cost via budget-boilers, or boilers whose brands have a poor reputation with both customers and professionals alike, could end up costing you more in the long run due to poor efficiency and performance or avoidable maintenance repairs.
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A quick guide on what common additional costs you may need to account for when it comes to getting a brand new shiny boiler.
Of course the main fee for boiler installation is that of the actual new boiler unit itself, without labour. New Boilers (just for the boiler unit) often can cost into the early thousands, especially for trusted and award-winning models.
Average boiler unit cost: £800 - £2,000
The next most vital fee to consider is the cost of the boiler being installed by a Gas Safe heating engineer.
This exact amount of this fee is usually dependent on several factors unique to each boiler installation, such as:
Region of the property
Complexity of the install
Boiler type and model
Number of engineers required
Added work (system or piping replacements)
Some more straightforward installations such as direct like for like swaps are far quicker and less expensive than old system conversions, for example.
Installation costs are always included in any fixed price iHeat new boiler quote, so you don't have to worry.
Average installation costs: £700 - £1,500
The flue is the pipe that transports exhaust gases to outside the home, an essential safety feature. Flues can either be vertical (straight up through the roof) or horizontal (sideways through a wall).
Vertical flues often require more intensive labour to fit correctly, and can therefore provide a higher cost.
Average vertical flue cost: £350 - £550
A plume kit is a component which extends the flue in order to divert the exit fumes in a safe manner, should the flue be deemed too close to features such as windows or gardens. A tad annoying as an additional cost perhaps, but an essential piece of safety equipment.
Average plume kit cost: £80 - £150
If your home has 15mm pipes they’ll need to be upgraded to roomier, and more efficient 22mm ones.
Here at iHeat, we safely swap out all old 15mm piping to new robust 22mm completely FREE, at no extra cost where applicable.
iHeat gas pipe upgrade cost: FREE
The added labour of physically moving a boiler to a new home within the property can bolster fees due to the added complexity of the install. The boiler, as well as pipework must safely be relocated and connected to ensure a smooth transition and continuation of central heating performance.
If this is something you think you require, please take a look at our in depth guide on boiler relocation.
CO (carbon monoxide) alarms are a specialist bit of kit that alerts a homeowner to potentially life threatening hazardous gas leaks.
With every new boiler installation iHeat offers a FREE CO alarm.
iHeat CO alarm cost: FREE
Helpful technology such as wireless thermostats allow a homeowner to easily control or adjust their property’s central heating or hot water production, all at the click of a button.
with every new boiler installation, iHeat offer a FREE wireless thermostat.
iHeat wireless thermostat cost: FREE
A boiler warranty is a little extra peace of mind for a homeowner that should a boiler begin to have issues at no fault of their own, within an appropriate time period, the manufacturer agrees to either fix or replace the unit.
Boiler manufacturers often offer extended warranties highlighting their confidence in their boilers performance and longevity.
Magnetic boiler filters trap pesky debris within the system to keep your boiler in the best possible working condition for the longest amount of time possible.
With every iHeat installation you get a FREE magnetic filter to protect your boiler from sludge and debris.
iHeat magnetic boiler filter cost: FREE
Chemical flushes are a system cleaning procedure that will remove any unwanted bits and bobs to allow your new boiler to run as best it can.
Chemical flushes are offered as part of every new boiler installation for FREE with iHeat.
iHeat chemical flush cost: FREE
Even after installing a brand new boiler, if your property's radiators are useless, your home still won’t be as toasty as you desire. If this is the case it’s worth replacing the older radiators with new and heat efficient ones.
Average radiator cost (full set): £300 - £400
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If you happen to qualify, the UK government actually runs a grant scheme to help aid with the financial aspects of getting a new and efficient gas boiler installed.
The ECO4 scheme is a government initiative that hopes to improve the UK’s energy efficiency while reducing fuel poverty. The government wants this scheme to be as helpful as possible with plans of upgrading 500,000 boilers by next year.
Qualifying criteria for a reduced cost boiler upgrade can include:
Universal credit
Pension credit
Child tax credit
Housing Benefit
Income support
(If you think your home would benefit from a biomass boiler, check out our guide on the Boiler Upgrade Scheme)
Modern gas boilers are far more energy efficient than older models, meaning by installing a new boiler, you would actually start to save money long term due to the reduced energy bill costs.
How much will you save with an A-rated boiler, you ask? Well, here’s a quick breakdown:
Property type | G (<70%) | F (70–74%) | E (74–78%) | D (78–82%) |
Bungalow | £385 | £275 | £220 | £170 |
Detached house | £715 | £515 | £415 | £330 |
Flat (mid-floor) | £170 | £110 | £90 | £65 |
Semi-detached | £430 | £310 | £245 | £190 |
Mid-terrace | £360 | £250 | £200 | £155 |
The average new boiler cost in the UK can vary depending on the type of new boiler and the complexity of the installation.
Combi Boilers - efficient and space-saving, combi boilers are the UK’s most popular boiler with an average cost of £2,500 - £3,500.
System Boilers - powerful and suited to large properties, new system boilers have an average cost of £2,200 - £3,500.
Conventional Boilers - reliable and straightforward, ‘heat-only’ boilers have an average cost of £1,800 - £3,200.
Electric Boilers - environmentally friendly and very efficient, these boilers have an average cost of £1,800 - £3,500.
Oil Boilers - traditional and robust, oil boilers have an average cost of £2,600 - £5,200.
Biomass Boilers - the greenest option for eco friendly homes, these boilers have an average cost of £9,000 - £15,000.
It can be important to remember that the cost of a new boiler installation isn’t only the cost of the appliance itself, but also everything that goes into the process to ensure safety and efficient performance.
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Most households pay between £2,000 and £4,000 for a new boiler supplied and installed. The price depends on the make, size, warranty, and whether extras like a filter or system flush are included.
In the UK, the average cost for a like-for-like replacement is £2,000 to £4,000. Regional labour rates, how straightforward the installation is, and any regulation upgrades can all change the total.
A combi-to-combi swap is usually £2,200 to £3,800. Converting from a system or regular boiler will cost more because tanks need removing and extra pipework is involved.
Gas boilers typically range from £2,000 to £4,000 installed. Electric models cost a similar amount to fit but are usually more expensive to run, while oil and LPG sit at the higher end.
For a typical 2–4 bedroom home, budget around £2,500 to £3,500 fully fitted. Moving the boiler or upgrading gas pipes and flues will add to the cost.
Gas combi, system or regular boilers usually run between £2,200 and £4,200 installed. Choose the kW output to suit your hot water demand and radiator load, not just the brand.
Labour for a simple replacement is normally £800 to £1,500. More complex jobs, like conversions or moving the boiler, can rise to £1,200–£2,500.
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