Updated: 6th January, 2025
Try a new boiler quote, finance available including 0% APR.
The cost of a new boiler depends on the installation type and many different variable costs. On average the cost of a new boiler installed can range between £1,500 and £4,500.
Getting a new boiler is an important decision for any UK homeowner or landlord. It’s not just about keeping your home warm; it’s also an opportunity to improve energy efficiency and save money in the long term.
In the UK, the cost of a new boiler typically ranges from £1,000 to £4,500, depending on the type, size, and features of the boiler. If you’re upgrading from an older back boiler to a modern combi boiler, the installation may cost more due to extra work like updating pipework or flue systems.
The price is also influenced by factors such as the brand, complexity of installation, and your location. Choosing the right boiler for your property ensures it operates efficiently and meets your heating needs.
Get a quote in 60 seconds, fitted as fast as next day!
0% APR finance available.
Always hire a Gas Safe registered engineer to install your boiler, ensuring safety and compliance. While the initial cost might seem high, a new boiler can save you money on energy bills and improve home comfort over time.
If affordability is a concern, there are finance options, grants, and payment plans available to help spread the cost. This means you can enjoy a warm, energy-efficient home without financial stress.
Whether you’re exploring boiler replacement costs or researching combi boiler prices, understanding these factors will help you make a smart decision that fits your budget and keeps your home cosy.
New Boiler Type | Cost (excl. Installation) | Cost (inc. Installation) | Quote |
Combi swap | £500 - £3,000 | £1,500 - £4,500 | |
System boiler | £580 - £3,500 | £1,700 - £4,000 | |
Conventional boiler | £600 - £3,500 | £1,700 - £4,000 | |
Electric boiler | £500 - £2,500 | £1,600 - £3,500 |
System type | Price (inc. Installation) | Quote |
Combi conversion | £1,500 - £4,500 | |
New full system install | £3,000 - £6,000 | |
Back boiler conversion | £3,000 - £5,000 |
(all tables are intended as a guide only)
In the UK, a boiler and boiler cost is central to a home's heating system, providing the necessary warmth and hot water throughout the year.
The weather can dictate a heavier reliance on a working boiler, especially during the colder months, making an efficient heating system paramount for both comfort and reducing energy costs.
Getting a new boiler with iHeat is simple, fast, and designed with your needs in mind. Our innovative approach ensures that the process is easy and hassle-free, putting customers at the heart of everything we do.
With iHeat, you can get a free, fixed-price online quote in seconds. We offer a range of premium, energy-efficient boilers designed to save you money, with next-day installation available to get your home warm again quickly.
The cost of installing a new boiler in the UK varies depending on factors like property size, boiler type, and installation requirements. In 2025, prices typically range from £1,600 for a basic system boiler to over £4,000 for advanced models with extended warranties and added features.
Smaller properties, such as flats, often require less powerful boilers than larger houses, which can help reduce costs. Regional differences also play a role, with installations in London and surrounding areas typically costing more.
High-efficiency boilers, including combi, system, and conventional models, can have higher upfront costs but often provide long-term savings on energy bills. Optional extras, such as smart thermostats and advanced controls, can increase the overall price but offer added convenience and energy management benefits.
For example, the cost of a new combi boiler generally falls between £1,500 and £3,000, with installation costs ranging from £500 to £1,500 depending on the job's complexity. Replacing an old boiler often costs between £2,000 and £3,500, especially if significant modifications, such as pipework updates, are required.
At iHeat, we prioritise transparency and ensure there are no hidden fees. Our expert team will guide you through selecting the best boiler for your home and ensure a smooth installation process, making upgrading your boiler stress-free and straightforward.
When choosing a boiler for home heating, it's important to understand the various types available to find the best fit for your needs:
Combi boilers are a great choice for smaller homes or apartments where space is limited. These compact units provide both heating and hot water directly from the boiler, so you don't need extra tanks or cylinders taking up room. They're perfect for properties with one bathroom, offering a quick and efficient solution for your heating and hot water needs.
However, if you have a larger household or often use hot water in multiple places at the same time, a combi boiler might struggle to meet high demands.
Boiler type | Prices |
Combi Boiler with Installation | £1,500 - £4,500 |
Combi Boiler without installation | £500 - £3,000 |
System boilers are a fantastic choice for homes with higher hot water demands, such as medium to large-sized properties with multiple bathrooms. Unlike combi boilers, they require a separate cylinder to store hot water, but the main heating components are built into the boiler itself, making installation quicker and more streamlined. If you have the space for a hot water cylinder but don’t need a cold water tank, a system boiler could be the perfect solution for your home’s heating and hot water needs.
It’s ideal for families who use hot water in several places at once, as the system can keep up with the demand.
Boiler type | Prices |
System Boiler with Installation | £1,500 - £4,000 |
System Boiler without installation | £550 - £3,000 |
Often known as 'regular' or heat-only boilers, these are perfect for older, larger homes with traditional radiator systems that have enough space for a separate hot water cylinder and a cold water storage tank. If your home has several bathrooms and high hot water demand, a regular boiler can efficiently supply multiple outlets at once, making it an ideal choice for larger families.
While they require more space for installation, they are highly effective at meeting the needs of bigger households where hot water usage is high throughout the day.
Boiler type | Prices |
Heat-Only with Installation | £1,700 - £4,000 |
Heat-Only without installation | £600 - £3,500 |
Electric boilers offer an eco-friendly solution, especially for smaller properties like apartments or smaller homes where gas isn’t an option. They’re highly efficient, easy to install, and produce no emissions on-site, making them a great choice for those looking to reduce their environmental impact. Electric boilers are particularly appealing if your electricity comes from renewable sources, as they align with green energy goals.
With prices ranging from £600 to £2,500 for the unit itself, they’re a cost-effective option for those prioritising sustainability and simplicity in their home heating.
Boiler type | Prices |
Electric Boiler with Installation | £1,600 - £3,500 |
Electric boiler without installation | £600 - £2,500 |
Biomass boilers are perfect for rural homes or properties with space to store fuel such as wood pellets, chips, or logs. They provide a sustainable heating solution by using biofuels to produce heat and hot water, helping to reduce reliance on fossil fuels. Ideal for those looking for an eco-friendly option, biomass boilers do require space for both the larger unit and the fuel storage. Installation costs for biomass systems typically range from £7,000 to £15,000, reflecting the advanced technology and the complexity of installation.
Boiler type | Prices |
Biomass Boiler with Installation | £12,000 - £20,000 |
Biomass Boiler without installation | £3,000 - £12,000 |
Condensing boilers are a versatile choice, suitable for properties of all sizes, from small flats to large detached homes. They are highly efficient because they capture heat from exhaust gases that would otherwise be lost through the flue, making them a great option for those wanting to reduce energy consumption and lower heating bills.
With their ability to make the most of every bit of heat, condensing boilers offer an eco-friendly and cost-effective solution for homeowners looking to improve their heating efficiency.
Boiler type | Prices |
Condensing Boiler with Installation | £1,500 - £4,500 |
Condensing Boiler without installation | £500 - £3,500 |
Average Price Range: £1,800 - £2,000
Cost Including Installation: £2,000 - £4,000
A new combi boiler combines a high-efficiency water heater and central heating boiler in one compact unit. Installation costs vary by complexity and installer rates.
Energy Efficiency: Lower energy costs.
Hot Water on Demand: No need for a separate hot water cylinder.
Space-Saving: Ideal for smaller homes.
High Demand Limitations: May struggle in larger homes.
Cold Water Inconvenience: No hot water if it breaks.
High Installation Cost: Though mitigated by energy savings.
Average Price Range: £1,600 - £2,800
Cost Including Installation: £2,100 - £3,500
New system boilers heat your central heating system and produce hot water for a storage cylinder. They are typically easier and less expensive to install than conventional boilers.
System boilers are beneficial for homes with multiple bathrooms as they provide a constant supply of hot water to any number of taps simultaneously. They are also:
Energy Efficient: Reduced heat loss.
Space-Efficient: Requires less space.
Compatible with Solar: Easily integrates with solar thermal systems.
However, system boilers also have drawbacks. They:
Require a Cylinder: A hot water tank is necessary, which can take up valuable space.
Do Not Provide Water on Demand: Unlike combi boilers, hot water isn't instant.
Initial Cost: Higher upfront costs compared to combi boilers, due to the cylinder and additional components.
Average Price Range: £1,800 - £3,500
Cost Including Installation: £2,300 - £4,500
Also known as new conventional or regular boilers, these systems work with a separate hot water cylinder and cold water storage tank.
Energy Efficiency: Less prone to leakage.
Substantial Hot Water Supply: Ideal for larger households.
Higher Initial Costs: For replacing old systems.
Space Requirements: Needs additional room for the hot water cylinder and tanks.
Potential Higher Running Costs: May not be as efficient as newer boilers.
Choosing the right boiler for your home can be integral to ensuring efficient heating and hot water in one's home. With a variety of brands offering distinct 2025 models that promise reliability and performance, it's important to compare the best options available.
Brand | Notable 2025 Model | Warranty Length | Noteworthy Features | Avg cost |
Vaillant | Vaillant ecoTEC Series | Up to 10 years | User-friendly controls, advanced safety | £1,000 - £3,500 |
Worcester Bosch | Worcester Greenstar Series | Up to 12 years | Energy-efficient, innovative technology | £1,400 - £3,000 |
Viessmann | Viessmann Vitodens Series | Up to 10 years | Premium materials, leading-edge tech | £1,200 - £3,000 |
Ideal | Ideal Logic Max | Up to 10 years | Cost-effective, reliable safety features | £1,000 - £2,500 |
Alpha | Alpha E-Tec | Up to 7 years | Simple operation, efficient performance | £1,000 - £2,500 |
(guide only)
As households aim to become more energy-efficient, new boiler installation presents a clear path to achieving that goal. Through improved boiler efficiency and advanced heating controls, homeowners can enjoy not just warmth but also long-term savings and an enhanced property value.
Why Upgrading to a Modern Boiler Makes Sense
Modern boilers are designed for superior performance, with energy efficiency levels far higher than older models. This means they use less fuel and distribute heat more evenly throughout your home, helping to keep energy bills down.
Smart Features for Better Control
New boilers often come with smart thermostats and smart radiator valves, giving you more control over your heating. This allows you to save energy without sacrificing comfort.
Long-Term Savings with a New Boiler
While the initial cost of a new boiler may seem high, the savings over time make it a worthwhile investment. Thanks to their improved efficiency, modern boilers can reduce your energy bills each month.
Energy Savings: Efficient boilers can significantly lower your energy bills.
Lower Maintenance Costs: New boilers are designed to require less maintenance, keeping costs down.
Peace of Mind: Many new boilers come with a warranty, reducing the chance of unexpected repair costs.
Increase Your Property’s Value with a New Boiler
A new, energy-efficient boiler can boost the appeal and value of your home. Potential buyers are often attracted to homes with modern, eco-friendly heating systems. Installing a new boiler could be a smart move if you’re looking to sell, as it makes your property stand out in a competitive market.
Boost Property Appeal: Modern heating systems make your home more attractive to buyers.
Better Return on Investment: Although the upfront cost of installation may be high, the added value to your home can make it well worth the expense.
In London and the South, boiler installation costs are generally higher due to the increased cost of living and labour. For a budget-friendly combi boiler, you can expect to pay between £2,000 and £2,500, including installation. If you're opting for a high-end model, the cost could rise to around £3,000.
In the North, including cities like Manchester and Liverpool, prices are typically a bit lower. Homeowners can expect to pay between £1,800 and £2,200 for a new combi boiler, including installation and labour.
Boiler installation costs in Birmingham and the Midlands are relatively moderate. Prices for a new boiler installation generally range from £1,700 to £2,100, with variations depending on the type of boiler and the complexity of the installation.
In Scotland, the cost of installing a new boiler is similar to that of the Midlands. Homeowners can expect to pay between £1,650 and £2,000 for a standard boiler installation, including labour.
Boiler installation costs in Wales are in line with those in Scotland and the Midlands. On average, you’ll pay between £1,600 and £2,000 for a new boiler, including installation and labour.
These figures give you an overview of boiler installation costs across different regions in the UK for 2025. As expected, prices tend to be higher in the South and lower in the North, with some regional variation depending on factors like boiler type and installation complexity.
Location | New Combi (inc. installation)* |
London | £1,970 - £2,045 |
Wider South | £1,945 |
Greater Manchester | £1,895 - £1,945 |
Wider North | £1,945 |
Midlands | £1,895 - £1,945 |
Scotland | £1,945 |
Wales | £1,945 |
*(Intended as a guide only and based on replacing an existing combi boiler with an Alpha E-tec Combi Boiler)
iHeat boiler prices are stress-free, fixed price and literally takes 60 seconds, with installation dates as fast as the next day.
Costs vary by region due to living expenses and labour rates.
London and the South are the most expensive.
The North and Midlands offer moderate pricing.
Scotland and Wales are comparable to the Midlands.
Deciding the right time for boiler replacement hinges upon several factors. A boiler's average lifespan is about 15 years; beyond this, it may become inefficient and costly to run.
They should recognise the symptoms of a boiler in decline which often include unusual noises, frequent breakdowns, and an increase in energy bills due to inefficiency.
Boilers can face issues such as rust and sludge accumulation which hinders performance; if a routine boiler service reveals such problems, they may consider a replacement.
Additionally, visible leaks are a clear sign the unit could be approaching the end of its viable life. An inefficient boiler not only raises operating costs but also impacts the environment negatively.
When evaluating new boiler options, efficiency and reliability are essential considerations. For systems like Worcester boilers, maintaining proper Worcester boiler pressure ensures long-term performance and energy savings, making your investment in a new boiler worthwhile. Pressure management is key to preventing unexpected faults and maximising your heating system’s lifespan.
If they observe that the boiler struggles to heat the home or water adequately, or if repairs are becoming more frequent and expensive, these could be indications that it's time to upgrade. Here's a concise checklist:
The boiler is older than 15 years
Persistent breakdowns and faults
An uptick in energy bills despite regular use
Presence of rust and sludge within the system
Leakages from the boiler
Inadequate heating or hot water provision
Understanding when to replace your boiler is paramount for ensuring comfort, safety, and efficiency in a home. If they experience any of the above issues with their boiler, they should consider consulting with a professional to discuss the possibility of a new, more efficient system.
Selecting the appropriate size of a boiler for one's home hinges on several pivotal factors, including the property's size, the heating requirements, and hot water needs.
It's about finding a balance between efficiency and ensuring you have enough hot water when you need it, without overspending on a heating system with excess power.
For a typical UK home, experts suggest allocating approximately 1.5 to 2 kilowatts (kW) per radiator. Consider this a starting point. Let's illustrate with some figures:
Number of Radiators | Ideal Boiler Size |
1-10 Radiators | A combi boiler between 21-28kW is typically adequate. |
11-15 Radiators | A 29-35kW combi boiler would likely suffice. |
16-21 Radiators | One should consider combi boilers of 36kW and above. |
When a property includes a hot water storage cylinder or tank, an additional 3kW is usually necessary to service this component of the system.
Therefore, accuracy in calculating the size becomes crucial, as an undersized boiler may lead to insufficient heating, while an oversized one could incur unnecessary costs.
Moreover, the decision also depends on the property size—larger homes necessitate more robust systems.
A terraced two-bedroom house, by contrast with a detached five-bedroom property, will have markedly different boiler size requirements.
In the case of combi boilers, which offer hot water on demand, the power output additionally defines the volume of hot water available at any given moment.
Hence, for homes with multiple bathrooms used simultaneously, homeowners may need to scale up the boiler power to meet the increased hot water requirements.
Try our iHeat boiler size calculator for expert boiler sizing advice in a few easy clicks!
For homeowners and tenants facing financial hurdles, the prospect of installing a new boiler might seem daunting.
However, various finance options and government schemes are specifically designed to make boiler replacement affordable for low-income households, ensuring that warmth and efficiency are not exclusive privileges.
Boilers on Finance offer a practical solution for those unable to pay the upfront costs. Many companies provide finance options, allowing customers to spread the cost over manageable monthly payments. With agreements often ranging from 3 to 10 years, the financial burden is significantly lessened.
Monthly Payments: Tailored to suit individual affordability
Credit Checks: Typically required to ensure eligibility
Boiler finance is available with iHeat, below is an example of how the prices work (guide only).
Brand | Interest rate (%) | Term (months) | Deposit | Price (£) | Interest payable (£) | Loan (£) | Payable (£) | Monthly |
Alpha | 12.9 | 120 | 50% | £1,965 | £724 | £985 | £2,689 | £14 |
Worcester | 12.9 | 120 | 50% | £2,295 | £848 | £1,155 | £3,143 | £17 |
Vaillant | 12.9 | 120 | 50% | £2,745 | £1,009 | £1,375 | £3,754 | £20 |
Ideal | 12.9 | 120 | 50% | £2,395 | £885 | £1,205 | £3,280 | £17 |
Overview
The Affordable Warmth Obligation is part of the broader Energy Company Obligation (ECO4) scheme. This initiative focuses on increasing home energy efficiency and reducing fuel poverty among underprivileged households in the UK. It provides support for the installation of energy-efficient and low-carbon heating systems, such as new boilers and insulation, to improve the overall energy efficiency of homes.
Goals
Support Vulnerable Households: By improving heating efficiency, the scheme aims to reduce energy costs and enhance living conditions for those in need.
Reduce Fuel Poverty: The program targets households struggling with high energy bills, helping them achieve more manageable energy costs.
Overview
ECO4 represents the fourth phase of the government's Energy Company Obligation initiative. This scheme works in partnership with the UK's largest energy suppliers to enhance the energy efficiency of homes, particularly focusing on those in need. ECO4 supports a variety of improvements, including boiler upgrades, better insulation, and other energy-efficient measures.
Goals
Reduce Energy Bills: By upgrading to more efficient heating systems and improving home insulation, the scheme helps reduce household energy bills.
Lower Carbon Emissions: ECO4 aims to decrease carbon emissions by promoting the adoption of energy-efficient technologies and practices.
Overview
The LA Flex Scheme provides local authorities with greater flexibility to identify and assist households that may not meet the national eligibility criteria under the ECO4 program. This empowerment allows councils to address specific local needs and ensure that more households can benefit from energy efficiency improvements.
Goals
Expand Reach: By broadening eligibility criteria, the scheme includes households that might otherwise be excluded, increasing the overall impact of the government's energy efficiency initiatives.
Address Local Needs: Local authorities can tailor support to meet the specific needs of their communities, effectively combating fuel poverty on a more localised level.
Overview
The Boiler Upgrade Scheme (BUS) provides financial assistance to homeowners and landlords to replace old, inefficient fossil fuel heating systems with newer, greener technologies like heat pumps and biomass boilers. This initiative is part of the UK's effort to promote sustainable heating solutions and reduce carbon emissions.
Goals
Promote Low-Carbon Heating: By offering financial support for the installation of heat pumps and biomass boilers, the scheme encourages the adoption of low-carbon heating technologies.
Reduce Environmental Impact: The initiative aims to decrease the environmental footprint of home heating, contributing to the UK’s broader carbon reduction targets.
iHeat have rapidly become one of the heating industry's leading lights, revolutionising the way people buy boilers and putting the customer first.
Due to their efficiency, expertise and ease of use, iHeat are one of the most reliable and celebrated names in UK heating, as evidenced by over 7,000 five-star reviews on Trustpilot to date.
Another hallmark of iHeat's passion and performance is their Which? trusted trader accreditation, the gold standard in new boiler installation.
New boilers offer increased reliability, reducing the likelihood of breakdowns and providing peace of mind during colder months. Improved home heating quality ensures a consistently warm living environment, while new boilers can also boost property value.
Understanding how much a new boiler costs, including the boiler installation cost and overall cost in the UK, helps homeowners make informed decisions.
When considering a boiler replacement cost, it's essential to factor in potential energy bill savings. New boiler prices can vary, but high-efficiency models often justify the expense. Evaluating the overall cost of a new boiler, including potential government incentives, allows homeowners to plan effectively.
The cost of a new boiler varies depending on the type, brand, and size of the unit. On average, new boilers cost between £1,500 and £4,500, including installation. Factors such as energy efficiency, warranty, and additional features can influence the price. For an accurate quote tailored to your home, it’s best to consult a professional installer.
In the UK, the price of a new boiler typically ranges from £1,500 to £4,500, including installation. This depends on factors like the boiler type (combi, system, or regular), the size needed for your property, and any optional extras such as smart controls. Investing in a modern, energy-efficient boiler can help save money on energy bills in the long run.
The cost of a new boiler should fall between £1,500 and £4,500, including installation, depending on the type, brand, and size of the boiler. While cheaper options are available, it’s important to balance cost with quality and energy efficiency to avoid higher running costs in the long term. Always get multiple quotes and ensure the installer is Gas Safe registered to ensure the best value for your money.
A new combi boiler typically costs between £1,500 and £4,500, depending on the brand, output, and installation requirements. Combi boilers are popular in the UK for their efficiency and compact design, as they provide hot water and heating directly without the need for a storage tank.
The cost of a new gas boiler ranges from £1,500 to £4,500, including installation. Gas boilers remain one of the most common heating options in the UK due to their efficiency and reliability. Costs can vary based on the boiler’s size, energy rating, and any additional features like smart controls. For precise pricing, it’s best to consult a Gas Safe registered engineer.
Replacing a boiler typically costs between £1,500 and £4,500, depending on the type of boiler, its energy efficiency, and the complexity of the installation. Factors like removing the old boiler, upgrading pipework, or adding smart controls can increase the cost. To ensure value for money, always get a detailed quote from a qualified Gas Safe registered engineer.
08th January, 2025
Zoned heating is a way to improve efficiency in heating and cooling systems. It divides a...
Read Article
07th January, 2025
When a boiler overheats, it can cause significant issues. Components inside can get damage...
Read Article
06th January, 2025
Boiler corrosion happens when metal parts in boilers break down due to chemical reactions....
Read Article
