New Boiler Cost in 2025 & UK Installation Price Guide
Are you curious about how much a new boiler will cost in the UK in 2025? For UK homeowners, landlords, or those overseeing commercial properties, replacing or installing a new boiler represents a significant financial commitment.
This detailed guide provides a thorough breakdown of new boiler costs, covering supply, installation, and factors that influence gas boiler replacement costs, with pricing sourced from reputable UK merchants.
With energy prices climbing and efficiency becoming a priority, we offer expert insights to help you make an informed decision for your heating system in 2025.
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How Much is a New Boiler? Overview
The average cost of a new boiler in the UK falls between £1,800 and £6,000, including installation, depending on the boiler type, brand, property size, and installation complexity.
Below, we explore key factors affecting boiler replacement costs, supported by pricing data from City Plumbing and similar merchants.
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Key Factors Influencing Boiler Prices
When it comes to new boiler prices, the spectrum is quite broad, ranging from £550 to £3,000 for the best boilers, excluding installation and additional expenses. We always recommend getting a few new boiler quotes to ensure you get the best deals.
This vast range in boiler prices is primarily driven by the following factors:
- Boiler’s model
- Boiler manufacturer
- Performance
- Warranty
- Size (output rating)
For instance, a top-of-the-line best combi boiler from a renowned manufacturer with high performance and an extensive warranty will certainly cost more than a basic model from a lesser-known brand.
Installation complexity is another factor; a straightforward combi swap is less costly than converting from a conventional boiler to a combi, which may involve removing tanks and upgrading pipework.
The size of your property and its heating needs influence boiler prices, as larger homes or those with multiple bathrooms need higher-output boilers. Additional upgrades, such as power flushes, magnetic filters, or thermostatic radiator valves (TRVs), can increase the total cost.
Location affects boiler pricing, with labour costs being higher in London and the South East. Finally, government grants like the Boiler Upgrade Scheme (BUS) and ECO4 can significantly reduce costs for eligible households, particularly for low-carbon heating systems.
The Costs of Different Boiler Types
The boiler cost largely depends on its type. For instance, combi boilers typically cost between £500 and £3,000, while system boilers average from £590 to £3,500, and conventional boilers range from £610 to £3,500 without installation.
| Type of boiler | Price Range |
| Combi Boiler | £500 – £3,000 |
| System Boiler | £590 – £3,500 |
| Regular Boiler | £610 – £3,500 |
| Electric Boiler | £400 – £2,500 |
| Oil Boiler | £1,000 – £4,000 |
Each of these boiler types has its unique features and benefits, making them suited to different home sizes and energy needs.
Selecting the appropriate boiler type involves balancing cost, efficiency, and suitability for your property. Below, we detail the main boiler types, their average costs from merchants like City Plumbing, and their ideal applications, presented with pricing tables for clarity.
Combi Boiler Prices
Combi boilers are best suited for small to medium-sized homes or flats with one to two bathrooms. They offer lower boiler installation costs and a compact design, eliminating the need for additional tanks.
However, they may struggle to meet high hot water demand in larger homes or areas with low water pressure. The average cost for a combi boiler, including installation, ranges from £1,800 to £4,000.
| Combi Boiler Costs | Price Range | Details |
|---|---|---|
| Boiler (Supply Only) | £700–£1,800 | E.g., Worcester Bosch Greenstar 30i (£1,100), Baxi 624 Combi (£850) |
| Installation Cost | £800–£1,500 | Simple combi swap, varies by region |
| Total Cost | £1,800–£4,000 | Includes supply and installation |
Read more – What do if your boiler is broken
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System Boilers Prices
System boilers provide a consistent hot water supply, making them suitable for larger households, though they come with higher installation costs and the need for cylinder space. The average cost for a system boiler, including installation, ranges from £2,500 to £5,000.
| System Boiler Costs | Price Range | Details |
|---|---|---|
| Boiler (Supply Only) | £800–£2,000 | E.g., Vaillant ecoTEC Plus (£1,200) |
| Installation Cost | £1,000–£2,000 | Includes pipework and labour |
| Hot Water Cylinder | £500–£1,000 | Replacement or new cylinder |
| Total Cost | £2,500–£5,000 | Includes supply, cylinder, and installation |
Conventional Boilers
These gas boilers are reliable for high hot water demand and work well in larger homes, but their installation is complex, expensive, and time-consuming, requiring significant space for tanks. Conventional boilers are less common due to these factors. The average cost for a conventional boiler, including installation, ranges from £2,200 to £5,500.
| Conventional Boiler Costs | Price Range | Details |
|---|---|---|
| Boiler (Supply Only) | £700–£2,500 | E.g., Ideal Logic Max Heat (£1,000) |
| Installation Cost | £1,000–£2,500 | Includes pipework and labour |
| Tank Replacement | £500–£1,500 | Hot water cylinder and/or cold water tank |
| Total Cost | £2,200–£5,500 | Includes supply, tanks, and installation |
Boiler Replacement Costs
Moreover, the complexity of the boiler installation can make a significant difference in the overall cost.
Therefore, when purchasing and installing a new boiler, customers can expect to spend between £1,500 and £5,000 in total, which includes the boiler replacement costs required by a Gas Safe heating engineer.
| Type of installation | Average Cost |
| Combi boiler replacement | £2,295 |
| System to combi conversion | £2,699 |
| New boiler installation — no current boiler | £2,899 |
| Back boiler to a combi conversion | £3,499 |
| New system boiler replacement | £2,295 |
| Megaflo unvented boiler installation | £2,999 |
Back Boiler to Combi Conversion Costs
If you have a back boiler and are considering converting it to a combi boiler, you should be aware of specific costs and processes. The conversion process typically includes:
- Removal of old pipework and back boiler
- Installation of new pipework and the new boiler
- System flushing
- Full radiator balancing
This process usually takes around two days.
Cost to change from a back boiler to combi
The cost of converting from a back boiler to a combi boiler varies, typically ranging from £3,000 to £5,000, with an average cost around £4,000.
The total conversion cost is influenced by the specific new boiler selected, the location of the existing setup, and the complexity of the new pipework required, not just the purchase price of the boiler itself.
So, while the upfront cost of converting a back boiler to a combi boiler might seem high, the benefits of having a more efficient, space-saving, and maintenance-friendly heating system can make the investment worthwhile. It’s a major shift, but one that can lead to long-term comfort and savings.
Read more – Back boiler to combi conversion costs
Breakdown of Boiler Installation Costs
The cost of installing a new boiler typically ranges from £800 to £2,500, depending on the boiler type and installation complexity. Below is a detailed pricing table outlining the components of installation costs.
| Installation Cost Component | Price Range | Details |
|---|---|---|
| Labour Costs | £800–£1,250 | Standard combi swap; up to £2,500 for system/conventional |
| Materials | £100–£500 | Flue pipes, copper fittings, radiator valves |
| Power Flush | £300–£750 | Cleans sludge from heating system |
| Magnetic Filter | £100–£200 | Prevents blockages, extends boiler life |
| Flue Extension/Plume Kit | £75–£300 | Required for some installations |
| Pipework Upgrades | £200–£500 | To meet Gas Safe regulations |
| Waste Removal | £50–£150 | Disposal of old boiler/tanks |
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Popular Boiler Brands and Their Price Ranges
The choice of boiler brand affects both cost and long-term reliability. Below is a boiler pricing table for top UK brands available at City Plumbing and similar merchants.
| Brand | Price Range (Supply Only) | Details |
|---|---|---|
| Worcester Bosch | £1,000–£2,500 | Reliable, efficient, often Which? Best Buy |
| Viessmann | £900–£2,200 | Cutting-edge technology, sustainable |
| Baxi | £850–£1,500 | Budget-friendly, reliable (e.g., Baxi 624 Combi) |
| Vaillant | £1,000–£2,000 | High performance, long warranties |
| Ideal | £700–£1,800 | Competitive pricing, up to 12-year warranties |
Choosing brands with long warranties (10–12 years) and hiring Gas Safe-approved installers ensures reliability and compliance.
What about cheap boilers?
When considering the cost of cheap boilers, it’s also essential to understand that there are budget-friendly brands available in the market. Some of these brands include:
- Alpha
- Glow-worm
- Ideal Boilers
- Potterton
- Vokera
You can read more about our best combi boiler under £1,000 now for more information.
These brands offer affordable heating solutions and have a range of economically-priced models. Vokera, in particular, positions itself as a no-frills, cost-effective option.
While these brands may not offer the high-end features found in some premium brands, they can be a great choice for those on a tight budget. But remember, the initial cost is just one factor to consider.
Exploring Alternatives: Oil and Electric Boilers
Oil boiler cost
Not everyone has access to the gas network, such as homes in rural areas. For homes not connected to the gas network, oil boilers are a viable alternative, using oil or diesel fuel for heating.
The cost for a new oil boiler starts at £1,200, potentially exceeding £4,500, with the total replacement cost including installation ranging from £2,500 to £7,000.
It’s worth noting that oil boilers can incur higher annual running costs, approximately £1,300, making them pricier than gas options. If you need an oil boiler installation, then you will also require the expertise of an OFTEC registered engineer.
Electric boiler cost
In the search for cheaper alternatives to gas, you may have considered electric powered boilers.
Therefore, electric boilers present another option for those without gas connections or looking to reduce their carbon footprint; however, running costs are much higher.
Prices for electric boilers vary from £500 to £3,000, with electric boiler installation costs being around £1,500 to £3,000 depending on the type chosen.
While electric boilers are eco-friendlier, they are generally more expensive to run than gas and oil boilers due to the higher cost of electricity, limiting them mainly to flats or 1 bedroom homes.
Government Grants and Financial Support
Did you know that you could get assistance from the government to help with your boiler costs?
Homeowners who can’t afford a new boiler have access to several government schemes aimed at helping them upgrade their heating systems, including the Boiler Upgrade Scheme (BUS) and the ECO Scheme.
Government schemes can lower the cost of a new boiler or low-carbon heating system for eligible UK homeowners and landlords. The Boiler Upgrade Scheme (BUS) provides grants of £7,500 for heat pumps and £5,000 for biomass boilers, available until 2028.
The Energy Company Obligation (ECO4) offers funding for energy-efficient boiler replacements for low-income households, running until March 2026. The Home Energy Scotland Grant supports clean heating systems in Scotland.
| Grant Scheme | Funding Amount | Eligibility |
|---|---|---|
| Boiler Upgrade Scheme (BUS) | Up to £7,500 | Replacing fossil fuel systems with heat pumps/biomass |
| ECO4 | Varies | Low-income households, benefit recipients |
| Home Energy Scotland Grant | Varies | Scottish homeowners installing clean heating |
Contacting MCS-certified installers to confirm eligibility and obtain quotes for grant-supported installations is recommended.
Grants such as the HHCRO under the ECO scheme are targeted at homeowners who meet specific conditions pertaining to:
- benefits
- income
- boiler efficiency
- property size
Read more – Boiler tax
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Spreading the cost of a boiler
If you already think that you can’t afford a boiler, you can increase the cost by using our boilers as a finance service. This basically means that you can pay monthly for a new boiler over a set period of time from 2 years up to 10 years.
Boilers on finance
Our boiler finance options are:
- Interest-free
- £0 deposit
- Market-leading 9.9% APR
- Buy now pay later
You get all this at Boiler Central, which means that you get the boiler you need today and pay back at your own pace.
Choose interest-free boilers on finance, and you won’t pay any interest, which means if you get your boiler replaced, it won’t cost any more than it would if you paid upfront.
We also offer bad credit pay monthly boilers, including our Infinity plans and specialist lenders for people with a poor credit file or who have been declined boiler finance elsewhere.
Running Costs Of New Boilers: Tips and Tricks
Navigating new boiler costs can seem like a daunting task, but with the right tips and tricks, you can make informed decisions that save you money.
Switching to a new, energy-efficient boiler is a cost-smart move for reducing carbon footprint.
It can save households approximately £1,080 while waiting for new renewable technologies to become more financially viable.
Switching from older, less efficient boilers to newer models leads to a reduction in monthly bills as central heating running costs are lower, plus the added bonus of lower repair costs.
While it might be tempting to try and reduce costs by doing some preparation work yourself, it’s important to remember that improper installation can lead to high repair costs down the line.
Running costs of an electric boiler can be lowered by utilising renewable energy options and government support schemes in the UK. So, consider not only the upfront costs but also the long-term running costs and potential savings when planning your new boiler installation or replacement.
Seasonal Offers & Summer Discounts
To minimise expenses related to boiler maintenance and acquisition, leveraging seasonal offers and summer discounts can prove highly beneficial.
Many companies initiate enticing promotional campaigns during traditionally slower sales periods, like offering cheaper boilers during summer, to stimulate demand.
These campaigns often feature significant markdown – sometimes up to 25% off energy costs when installing new, more efficient boilers.
These discounts not only reduce the upfront cost associated with purchasing a new boiler but also ensure ongoing savings through reduced energy expenditures.
By taking advantage of these offers, homeowners can alleviate initial financial pressures and enjoy reduced operational costs over the boiler’s lifespan.
Our Verdict
We’ve taken a deep dive into the world of new boiler costs, exploring factors like boiler type, brand, fuel type, and modern technologies that can impact the final price tag. We’ve also discussed government grants that can help offset the cost of gas boiler replacement and offered tips and tricks to navigate new boiler costs effectively.
The key takeaway is that while the initial cost of a new boiler can be substantial, considering factors like energy efficiency, long-term running costs, and potential savings can provide a clearer perspective.
Whether you’re considering a combi boiler, a system boiler, or a conventional boiler, remember to do your research, get multiple quotes, and consider both your comfort needs and budget.
This means you get to see the price of a combi boiler or system boiler before you purchase, allowing you to get the best deal possible.
After all, a new boiler is not just an expense but an investment in your home’s comfort and efficiency.
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Frequently Asked Questions
How much is a new combi boiler?
The price of a new combi boiler in the UK usually ranges from £1,600 to £4,000, including installation, although this can differ depending on a number of factors.
Many homeowners spread the combi boiler replacement cost with finance options, making the purchase easier.
Can I Purchase a Boiler Directly from the Manufacturer?
Yes, you can sometimes find great deals by purchasing directly from manufacturers; however, in the same breath, they can also charge more for going direct. Prices for new boilers, when bought directly, can vary significantly based on the brand, type, and model, and you should always get a range of quotes.
Are there any potential hidden costs in boiler installation?
Installation costs can vary widely depending on the complexity of the installation, the need for additional pipework, or changes to your home’s heating infrastructure. Switching boiler types or installing the boiler in a new location can also add to the cost.
How many years should a boiler be replaced?
You should replace your boiler around every 15 years. An older boiler has to work harder to heat your home, so it’s best to replace it after this time period.
How much do British Gas charge for a new boiler?
A British Gas new boiler costs between £2,500 to £4,500 for a new gas boiler installation, including the cost of the boiler and installation labour, but the price can vary based on location and the scope of the installation.
Is replacing a boiler a big job?
Replacing a boiler can be a significant job, especially if it involves changing to a new type or location, which may require extensive work like removing floorboards and pipework. The duration of boiler installation depends on the size of the property.
