System Boiler Prices & Installation Costs

Last Updated on January 28, 2025

When it comes to upgrading or replacing your home’s heating system, understanding system boiler prices and installation costs is essential. Choosing the right boiler for your home is a significant investment, and with so many options available, it can be overwhelming to determine which one is best suited to your needs and budget.

This guide is here to simplify the process. We’ll discuss the various factors that influence system boiler costs, from the price of the boiler itself to the cost of installation. Whether you’re looking for a high-efficiency model to reduce energy bills or comparing the latest brands to find the best value, we’ve got you covered.

From understanding the impact of boiler size, output, and fuel type on pricing to comparing system boilers with other heating systems, this guide will equip you with the insights you need.

Let’s dive in!

System Boiler Prices – Summary

• System boiler prices vary depending on brand, size, output and fuel type.
• Considerations such as the cost of installation and features should be taken into account when selecting a system boiler.
• Comparing different types of boilers can help homeowners make an informed decision to find the most cost-effective heating solution for their home.

How Much Does a System Boiler Cost?

According to industry insights, the cost of a new system boiler typically ranges from £700 to £2,500, depending on factors such as:

• Brand
• Size
• Output
• Fuel Type

Additionally, installation costs can range from £500 to £1,500, depending on the complexity of the installation and your home’s specific requirements.

It’s important to note that these figures are estimates, and the final cost may vary based on your unique circumstances. Comparing quotes from multiple reputable installers is a great way to find the best deal that suits your budget.

While lower-cost options may seem appealing, investing in a higher-quality, energy-efficient system boiler can save you money in the long run through reduced energy bills and lower maintenance costs.

Factors That Affect System Boiler Costs

Let’s take a closer look at the factors that affect system boiler prices.

Brand

You have likely seen multiple boiler manufacturers throughout your time as a homeowner. Knowing which system boiler brand best suits your home and what price range they are in will help you massively in deciding on your new boiler.

The brand of the system boiler can affect the price, with premium brands typically costing more but offering better quality and longer warranties. For instance, Worcester Bosch, a renowned brand in the UK, can have a higher price tag when compared to other market offerings.

However, other brands like Baxi can be priced more competitively. Consider the advantages and disadvantages of each brand, including aspects like:

• Reliability
• Efficiency
• Performance
• Warranty
• Aftercare and servicing

Different system boiler brands offer warranties ranging from 1 to 10 years, which can have an impact on the overall cost. Longer warranties can provide greater peace of mind, and some brands may even offer extended warranties that can be purchased for an additional fee.

When comparing system boiler prices, always consider the warranty offered by different brands.

Size and output considerations

The size and output of a system boiler play a crucial role in determining its cost. System boilers are available in a range of sizes, typically measured in kilowatts (kW), which indicates their heating capacity. Choosing the correct size for your home is essential to ensure efficient and effective heating.

Larger homes with more radiators and higher hot water demands will require a boiler with a higher kW output to meet their needs, which often comes at a higher price. Conversely, smaller properties may only require a lower-output boiler, which can be more affordable.

It’s important to strike the right balance—purchasing a boiler that’s too small for your home can lead to inefficiency and insufficient heating, while one that’s too large may result in unnecessary energy consumption and higher operating costs.

If you’re specifically looking for a boiler that can efficiently handle larger homes or high hot water demands, check out our list of the Best 40kW System Boilers. We’ve carefully selected some of the top 40kW system boilers that offer impressive performance and value. By choosing the right size, such as these larger models, you can ensure your home stays warm and your energy use remains efficient.

Consulting with a heating professional can help you determine the optimal size and output for your home, ensuring you get the best value for your investment.

Fuel type and efficiency

Throughout the UK, boilers use different types of fuel to power them, with the fuel depending on the type of boiler you have installed. For example, a boiler could use natural gas as the fuel, or you may have an oil system boiler or an electric boiler.

The fuel type and efficiency of the system boiler will also affect the price. Here are some factors to consider:

• Gas boilers: These are popular in the UK due to their cost-effectiveness and ease of connection to the gas grid. However, they have higher carbon emissions than other fuel types.
• Oil boilers: These are more affordable upfront but may be less efficient and eco-friendly compared to other options.
• Electric boilers: These are generally more expensive upfront but are highly efficient and eco-friendly.
• LPG boilers: These are an alternative to gas boilers and are often used in areas without access to the gas grid.

LPG system boilers are more eco-friendly than gas or oil boilers but require an external tank and can be more expensive to run. On the other hand, electric system boilers are the most environmentally friendly option, with efficiency ratings of up to 99% but higher running costs due to electricity prices.

When selecting the best system boiler for your home and budget, keep in mind the fuel type and energy efficiency.

Types of System Boilers

Having examined the factors influencing new system boiler prices, we will now discuss the various types of system boilers and their costs, including:

• Gas system boilers
• LPG system boilers
• Electric system boilers
• Oil system boilers

Each system boiler type has unique advantages and disadvantages. Understanding these differences can aid in making a knowledgeable decision when selecting the right system boiler for your home.

From the most popular gas system boilers to the eco-friendly electric options, the choice of fuel type and boiler features can significantly impact the overall cost and efficiency of your heating system. We will now examine how each type of system boiler works and their respective costs.

Gas system boilers

Gas system boilers remain a popular choice in the UK due to their affordability and the widespread availability of the gas grid. They are particularly suitable for homes with multiple bathrooms or high hot water demand, providing both central heating and hot water efficiently.

As of 2025, the cost of gas system boilers in the UK varies based on brand, size, and features. Economical models typically range from £700 to £1,000, while mid-range options are priced between £1,000 and £1,500. Premium models with advanced features can exceed £2,000.

It’s important to note that these prices are approximate and can fluctuate based on factors such as brand reputation, energy efficiency ratings, and additional features. Therefore, it’s advisable to compare different models and consult with reputable installers to determine the most suitable option for your specific needs and budget.

LPG system boilers

LPG (Liquid Petroleum Gas) system boilers are an excellent alternative for homes not connected to the natural gas grid. They offer efficient heating solutions, though it’s important to consider both the initial and ongoing costs associated with them.

Cost Considerations:

• Boiler Price: As of 2025, LPG system boilers are available in various models and outputs. For instance, the Worcester Bosch Greenstar 8000+ 30kW LPG System Boiler is priced at approximately £1,717.39, while the Worcester Greenstar 4000 18kW System Boiler LPG is around £1,374.22.
• Installation Costs: The total cost of purchasing and installing an LPG boiler ranges between £3,300 and £5,300. This includes the boiler unit, installation labour, and the LPG storage tank.

Efficiency and Environmental Impact:

LPG boilers are known for their high efficiency, often achieving over 90% efficiency rates, meaning a significant portion of the fuel is converted into usable energy. While LPG is a cleaner-burning fossil fuel compared to oil, it still produces carbon emissions. However, it is considered more environmentally friendly than traditional oil boilers.

Additional Considerations:

• Fuel Storage: LPG requires an external storage tank, which can be either above or below ground. This necessitates adequate outdoor space and regular fuel deliveries.
• Running Costs: The price of LPG can be higher and more variable compared to natural gas, leading to potentially increased running costs. It’s advisable to research local LPG suppliers and consider long-term fuel contracts to manage expenses effectively.

When evaluating LPG system boilers, it’s crucial to balance the initial investment, installation requirements, and ongoing operational costs. Consulting with a qualified heating engineer can provide personalised insights to determine if an LPG system boiler is the most suitable and cost-effective solution for your home’s heating needs.

Electric system boilers

Electric system boilers are considered an environmentally friendly heating option, as they produce no on-site emissions. However, due to higher electricity costs, they can be more expensive to operate compared to gas or oil boilers. Unlike traditional boilers, electric system boilers heat water directly from the mains when a hot tap is turned on, eliminating the need for a hot water storage cylinder or a cold water storage tank.

Cost Considerations:

• Boiler Unit Price: As of 2025, electric system boilers are available in various models and outputs. For instance, the Elnur Mattira 3kW electric system boiler is priced at approximately £1,200, while the Heatrae Sadia Electromax 9kW electric boiler is around £2,000.
• Installation Costs: Installation expenses for electric boilers typically range from £500 to £1,000, depending on the complexity of the installation and regional labour rates.

Efficiency and Running Costs:

Electric boilers boast high efficiency ratings, often up to 99%, meaning nearly all the electricity consumed is converted into usable heat. However, electricity prices are generally higher than those of gas or oil, leading to increased running costs. For example, between 1 January and 31 March 2025, electricity prices are capped at 24.86p per kilowatt-hour (kWh), while gas prices are capped at 6.34p per kWh.

This significant difference means that, despite their efficiency, electric boilers can be less cost-effective over time.

Additional Considerations:

• Environmental Impact: While electric boilers produce zero on-site emissions, the overall environmental benefit depends on the electricity source. Utilising renewable energy sources can enhance their eco-friendliness.
• Suitability: Electric boilers are ideal for smaller homes or flats with lower hot water demands. They are also a viable option in areas where gas supply is unavailable or installation of gas boilers is impractical.

When considering an electric system boiler, it’s essential to weigh the higher operational costs against the environmental benefits and installation simplicity. Consulting with a qualified heating engineer can help determine if an electric boiler is the most suitable choice for your home’s heating requirements.

Oil system boilers

Oil system boilers are a reliable heating solution for homes not connected to the gas grid, offering efficient heating and hot water. However, it’s important to consider both the initial investment and ongoing operational costs when selecting an oil boiler.

Cost Considerations:

• Boiler Unit Price: As of 2025, oil system boilers are available in various models and outputs. For instance, the Navien LCB700 21kW Internal Oil System Boiler is priced at approximately £2,266.
• Installation Costs: Installation expenses for oil system boilers typically range from £500 to £2,000, depending on the complexity of the installation and regional labour rates.

Efficiency and Running Costs:

Modern oil system boilers can achieve efficiency ratings of up to 90%, meaning a significant portion of the fuel is converted into usable heat. However, oil prices are subject to market fluctuations, which can impact running costs.

Additional Considerations:

• Fuel Storage: Oil boilers require an external storage tank, which can be either above or below ground. This necessitates adequate outdoor space and regular fuel deliveries.
• Environmental Impact: While oil boilers produce carbon emissions, they are generally more efficient than older models, leading to reduced emissions. However, they are still less environmentally friendly compared to gas or electric boilers.

When evaluating oil system boilers, it’s essential to balance the initial investment, installation requirements, and ongoing operational costs. Consulting with a qualified heating engineer can provide personalised insights to determine if an oil system boiler is the most suitable and cost-effective solution for your home’s heating needs.

Top System Boiler Brands

There are many boiler brands all over the UK and Europe, all offering different types of boilers at different costs.

These are top system boiler brands in the UK:

• Worcester Bosch
• Vaillant
• Ideal
• Baxi
• Viessmann

Each of these brands offers a range of high-quality system boilers designed to cater to different home heating needs. Understanding their differences can help you make an informed decision when choosing the right system boiler for your home.

By comparing the prices, features, and warranties provided by these leading system boiler brands, you can guarantee the best value for your money and a dependable heating solution for your home. Make sure to explore our detailed guide on the best system boilers to find the perfect model that fits both your budget and your needs.

Comparing System Boiler Costs with Other Boiler Types

Having an understanding of system boilers and their costs, it’s important to contrast them with other boiler types, such as combi and conventional boilers, to assist you in making the best decision for your home’s heating needs.

By comparing the costs and features of each boiler type, you can ensure that you’re getting the most suitable and cost-effective heating solution for your home.

Each boiler type has its own set of advantages and disadvantages, and understanding these differences can help you make an informed decision when choosing the right boiler for your home. We will now examine combi and conventional boilers more closely to see how they compare to system boilers in terms of cost and functionality.

Combi boilers

Combi boilers are more compact and provide instant hot water, making them a popular choice for smaller homes and those with limited space. These boilers have the following advantages:

• They heat water directly from the mains when a hot tap is turned on, eliminating the need for a hot water storage cylinder or a cold water storage tank.
• They are energy efficient, as they only heat the water that is needed.
• They provide a constant supply of hot water, without the need for waiting for a storage tank to heat up.
• They are easy to install and require less pipework.

The typical range of combi boiler costs is between £1,500 and £2,500.

While combi boilers can be more cost-effective and space-saving, they may not be suitable for larger homes with high hot water demand. In such cases, a system boiler or a conventional boiler might be a better fit, as they can provide a more consistent supply of hot water for multiple bathrooms and higher heating demands.

If you’re trying to decide between a system and a combi boiler, check out our system boiler vs combi boiler blog post. We’ve compared the key differences between these two types of boilers to help you make an informed decision about which one best suits your home’s needs.

Whether you’re looking for the space-saving benefits of a combi boiler or the reliable hot water supply of a system boiler, our guide will provide valuable insights to help you choose.

Conventional boilers

Conventional boilers, also known as regular or traditional boilers, require additional components and space, including a hot water cylinder and a cold water tank, but can be more suitable for homes with multiple bathrooms or low water pressure.

A regular boiler operates by heating water in the hot water cylinder, which then supplies the household’s central heating system.

The typical cost of a conventional boiler ranges from £1,500 to £3,000, making them comparable in price to system boilers. When considering a conventional boiler, it’s important to weigh the benefits and drawbacks, such as the need for additional space and components, against the potential advantages of providing a consistent hot water supply for homes with higher heating demands.

How Much Does It Cost to Install a System Boiler?

System boiler installation costs can vary depending on factors such as the complexity of the installation, the need for additional components, and the installer’s fees. The estimated cost range for system boiler installation is £650-£2,500.

To secure the best rates for system boiler installation in your area, it’s recommended to consult several installers and use services which can link you with up to 3 local, vetted installers for a system boiler installation.

A licensed heating engineer should be consulted for a system boiler installation. They can conduct an in-depth evaluation of your home and suggest a boiler that is precisely sized and suitable to satisfy your specific needs.

By obtaining several quotes and comparing the services provided by various installers, you can make sure you’re getting the most excellent boiler installed at a competitive price.

Get Your Free Quote for a System Boiler Today!

Ready to upgrade your home heating with a new system boiler? Requesting a free quote is easy! Simply fill in our quick and simple online form, answer a few straightforward questions about your home’s heating needs, and we’ll get back to you with a personalized quote within minutes.

No hidden costs, no obligation—just transparent pricing to help you make an informed decision. Don’t wait, get your free quote today and find the perfect system boiler for your home!

Our Verdict

In conclusion, system boilers offer a reliable and efficient heating solution for homes with multiple bathrooms or high hot water demand.

By understanding the factors affecting the cost of system boilers, such as brand, size, output, fuel type, and installation costs, you can make an informed decision when choosing the right system boiler for your home.

Comparing system boiler costs with other boiler types, such as combi and conventional boilers, and exploring the top system boiler brands can help you find the perfect heating solution for your home.

With this guide, you’re now equipped to make the best choice for your home’s heating needs, ensuring warmth and comfort for you and your family.

Frequently Asked Questions

Is a system boiler better than a regular boiler?

It depends on your needs. System boilers are ideal for homes with multiple bathrooms and a high hot water demand because they have an integrated water storage tank and can provide hot water to multiple taps simultaneously.

Regular boilers, also known as conventional boilers, require a separate hot water tank and are best suited for smaller homes with lower water demand.

Is a system boiler connected to the mains?

Yes, a system boiler is connected to the mains water supply, which provides a constant flow of water for heating and hot water.

Do system boilers run out of hot water?

System boilers are less likely to run out of hot water as they have a built-in hot water cylinder that stores water. However, if the cylinder runs out or is in high demand, you may experience a temporary shortage.

How long does water stay hot in a system boiler?

The water in a system boiler’s storage cylinder can stay hot for several hours, depending on the size of the cylinder and the insulation. However, it may need to be reheated if all the stored hot water is used.

Are system boilers more reliable?

System boilers are generally reliable due to their integrated components, which reduce the need for additional parts like a separate hot water tank. However, their reliability depends on regular maintenance and proper installation.