New Boiler Cost in 2025: UK Price & Installation Guide

Buying a new boiler in 2025 takes a lot of time, research, and money. Boilers are an essential part of our homes that keep us warm and cosy during the winter months. If you are planning to buy or replace a boiler, it is important to understand the new boiler cost in the current market. Determining the right cost can be tricky, as many factors influence the final price you pay.

In this blog, we will guide you through the process of estimating the cost of a new boiler, discuss the various factors affecting pricing, and provide updated insights for the UK in 2025. Read until the end to make a well-informed decision.

How Much Does a New Boiler Cost in 2025?

In general, the new boiler cost UK ranges between £1,500 and £6,000, depending on the boiler type, size, and installation complexity. Installation costs, including parts and labour, can range from £1,200 to £4,500, depending on your location and requirements.

Several factors contribute to these costs, which we will cover in detail. First, let’s explore the common types of boilers popular in the UK.

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Types of Boilers

Searching for a new boiler can be overwhelming due to the wide variety of options. To simplify things, here are the most common types of boilers in the UK:

1. Heat-only Boiler

• Description: Suitable for larger homes, a heat-only boiler provides hot water and central heating using a hot water cylinder and a cold-water storage tank. Ideal for homes with more than three bedrooms that require hot water in multiple bathrooms simultaneously.
• Cost: The estimated cost of a heat-only boiler is £1,500–£3,500, and the average cost including installation is £2,900–£4,000.

2. System Boiler

• Description: System boilers provide hot water and heating without needing an additional cold-water storage tank. They are connected directly to the mains and are more space-efficient than heat-only boilers.
• Cost: The cost of a system boiler ranges from £1,600–£3,800, with an average installation cost of £2,800–£4,200.

3. Combi Boilers

• Description: Combi boilers (combination boilers) are ideal for smaller homes or flats. They heat water and provide central heating without the need for a separate storage tank, making them space-efficient and easier to install. Suitable for homes with 2–3 bedrooms. Many modern combi boilers include a preheat function for instant hot water.
• Cost: A combi boiler cost typically ranges from £1,500–£4,000, including installation.

To know more about combi boilers, read our detailed blog: All About Combi Boilers: How They Work, Types, Advantages, and More Other Types

4. Electric Boiler

• Description: Electric boilers use electricity to heat water and provide central heating. They are ideal for homes off the gas grid or for households wanting a low-carbon option. They are easy to install, requiring no flue or condensate pipe. Electric boilers achieve up to 99% efficiency, compared to 70–90% for gas boilers.
• Cost: The estimated price ranges from £1,750–£3,250, with installation included. Electric boilers are also compatible with solar panels for additional energy savings

5. Biomass Boiler

• Description: Biomass boilers use renewable energy sources such as wood pellets to heat water and provide warmth. They are highly eco-friendly but require space for installation and storage of fuel.
• Cost: Biomass boilers are more expensive, with prices ranging between £6,000–£14,500 including installation.

Cost Comparison Table (2025)

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Additional Factors That Affect New Boiler Cost

1. Boiler Size

The bigger your home, the larger the boiler required, which increases cost. Consider:

• Number of bedrooms
• Number of bathrooms
• Number of radiators
• Level of home insulation

To know more about combi boilers, read our detailed blog: What size of boiler do I need?

2. Boiler Type

Switching from one type to another (e.g., heat-only to combi) affects costs due to installation complexity, including flue, pipework, and additional labour.

3. Model and Brand

Top brands such as Worcester Bosch, Vaillant, Ideal, Glow-worm, and Vokèra offer reliable models with warranties. Premium brands may increase the new gas boiler cost but offer long-term reliability.

4. Fuel Type

Another important factor that you must consider that influences the cost of a boiler is the fuel type. Primarily, you will be choosing among three options:

• Electric Boilers:

£1,750–£3,250, installation £2,800–£3,900.

• Gas Boilers:

Most popular in the UK; cost ranges from £2,000–£4,000, with installation £1,500–£4,000.

• Oil Boilers:

Suitable for homes off the gas grid; cost ranges £1,200–£2,800, installation £2,500–£4,000.

5. Boiler Relocation

Changing the boiler location increases costs due to extra pipework, labour, and fixtures.

6. Radiator Replacement

Old radiators may need replacement for optimal performance; estimated cost £200–£400 per radiator.

7. Magnetic Filter

Installed inline to prevent sludge and corrosion; cost ranges £100–£200.

8. Chemical Flush

Removes debris from central heating; cost £100–£150. Power flush may be needed for older systems.

9. Upgrading Warranty

Extended warranties are recommended for peace of mind and long-term reliability.

How to Avoid High Boiler Costs

• Obtain Multiple Quotes: Compare providers to find the best price for your needs.
• Monthly Payment Plans: Spread the cost of fitting a new boiler over time.
• Government Schemes: ECO4 and Boiler Upgrade Scheme offer financial support for energy-efficient boilers.
• Plan Ahead: Factor in radiator replacement, magnetic filters, and maintenance.

New Boiler Cost for a 4-Bedroom House

For a 4-bedroom house in 2025, you can expect:

• Combi Boiler: £2,500–£4,500
• System Boiler: £3,000–£4,500
• Heat-Only Boiler: £3,500–£5,000

These prices include installation but may vary depending on location, property type, and additional work needed.

Key Takeaways

Understanding the average new boiler cost, new boiler installation cost, and factors like type, fuel, brand, and home size will help you make an informed choice. By getting multiple quotes and exploring grants, you can optimise your expenditure while upgrading your home heating system.

For homeowners in London, expect slightly higher new boiler cost London due to labour and material charges.

If you’re unsure where to start, 247 can guide you through the process. Contact us on 0345 3192 247 for personalised advice.