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Last updated: 6th March, 2024


Boiler Installation Cost Calculator

Boiler Installation Cost Calculator

Key takeaways

  • Factors influencing boiler installation costs include brand, type, and complexity of installation.
  • It's essential to assess your home's heating and hot water demands when choosing a boiler.
  • Considering labour, fitting costs, and future repairs can help in selecting the best option for your needs.

Unlock the insights you need to estimate boiler costs in the UK accurately. Our comprehensive guide covers factors influencing new boiler expenses, ensuring you make informed decisions tailored to your budget and heating needs.

Boiler installations ensure efficient heating and hot water in your home. When considering a replacement gas boiler and its installation, it's crucial to understand the factors influencing the overall cost. 

The cost of a new boiler may hinge on elements such as the brand, warranty length, type of boiler, installation complexity, and additional features. Remember, investing in a quality boiler ultimately leads to savings in energy bills, improved comfort, and even adherence to safety regulations.

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Different types of boilers, such as combi, system, or regular, offer unique features and functions that cater to specific household needs.

Converting from other boilers, upgrading an existing system or simply replacing a boiler can impact installation costs.

Evaluating your specific heating and hot water requirements is essential to identify the most cost-effective and efficient option for your home.

Furthermore, labour and fitting costs, combined with potential future repair expenses, should be considered when making a decision.

Understanding Boiler Installation

When considering a replacement gas boiler, it's important to grasp the various aspects of boiler installation. Knowing the different types of boilers, their cost and the installation process can help to make a well-informed decision.

There are three main types of gas boilers: combi boilers, system boilers, and conventional boilers. 

Combi boilers are compact and efficient, providing central heating and instant hot water without the need for a separate storage cylinder. Their installation is relatively simple, with costs typically ranging from £1,600 - £2,500.

System boilers are similar to combi boilers in that they provide central heating and hot water. However, unlike combi boilers, they store hot water in a separate cylinder, making them suitable for homes with multiple bathrooms. These boilers can be more expensive to install, with costs falling between £1,700 - £2,000.

Conventional boilers, also known as regular or back boilers, require a cold-water storage tank and a hot water cylinder. They are best suited for larger homes. While these boilers are less energy-efficient, they might be the only option for some older properties. Installation costs for conventional boilers typically range from £1,900 - £2,200.

Gas boiler installation costs depend on several factors, including brand, warranty length, the complexity of the installation, and any extras such as smart thermostats. Installation packages usually include the boiler, necessary parts, labour, and certification, but costs can vary between £1,500 and £3,500.

Choosing a gas boiler with an efficiency of over 90% is essential. This helps lower energy consumption, reducing monthly running costs and contributing to a greener environment. Older models may have efficiencies lower than 50%, leading to higher energy bills.

In summary, installing a gas boiler involves selecting the right type, considering the costs and potential energy savings. To make an informed decision, it's advisable to research different brands and inquire with certified technicians about installation services and possible complications.

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Factors Influencing the Installation Cost

Numerous factors can influence the final price When considering the installation cost for a new gas boiler in the UK. It is essential to know these elements to understand better the expenses involved.

The cost of the boiler itself varies significantly depending on the make and model. On average, prices for a new boiler can range from £600 to £2,500. Other factors that affect the boiler's cost include the warranty length, fuel type, and brand quality.

Labour cost also plays a substantial role in determining the total boiler installation cost. Skilled heating engineers charge different rates depending on their experience and expertise. Aside from that, the complexity of the installation, such as the time required and additional modifications to the property, can impact labour costs.

The location of the boiler within the property is another contributing factor. Installing a gas boiler in a hard-to-reach spot or requiring significant pipe rearrangement can add to the installation expenses. Furthermore, the type of property and its size can affect the overall cost. For instance, larger properties with more rooms to heat would require a higher-capacity boiler, which may be more expensive.


Your postcode may influence the installation costs as well. Labour rates and the cost of materials may vary depending on the region you live in — with higher costs in large cities and lower expenses in more rural areas.

The choice of fuel type for the boiler can also have an impact on the installation cost. Gas boilers are generally more affordable and widely available, whereas oil or biomass boilers might be more expensive due to their fuel sources.

Finally, water pressure within your home's plumbing system can affect the type of boiler you need and thus affect the installation costs. Higher water pressure requires a more powerful boiler, while lower pressure might necessitate a different boiler system.

In conclusion, when researching and budgeting for a new boiler and its installation costs, it is essential to consider all the relevant factors to make an informed decision. By taking into account elements such as location, property type, fuel type, and water pressure, homeowners can ensure they get the most suitable boiler system for their needs while balancing cost-efficiency.

Key Differences in Boiler Types

Combi Boilers

Combi or combination boilers are central heating units and water heaters in one compact system. They heat water directly from the mains, eliminating the need for a separate storage tank. Because of their efficiency and space-saving design, combi boilers are popular in the UK. However, combi boiler costs can range from £600 to £2,000, depending on factors such as brand and installation complexity.

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System Boilers

Unlike combi boilers,

System boilers require a separate storage cylinder for hot water. They are suitable for homes with multiple bathrooms or high hot water demands. System boiler costs typically fall between £1,000 and £2,000, excluding installation fees. Key advantages of system boilers include a constant supply of hot water and reduced energy consumption in larger households.

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Conventional Boilers

Often referred to as regular or traditional boilers, conventional boilers use a separate storage tank for hot water and a feed/expansion tank for central heating. These boilers are suited for homes with an existing heating system or older radiators that may not tolerate high water pressure. Regular boiler costs vary between £1,200 and £2,500, excluding installation fees. Despite their lower efficiency than modern combi and system boilers, conventional boilers remain reliable for many households.

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Back Boilers

Back boilers, once popular in the UK, are now considered outdated and inefficient. These boilers are installed behind the fireplace and provide hot water and central heating. Back boiler replacement costs can be high, as modern alternatives such as combi and system boilers offer greater efficiency. It is recommended to replace back boilers with more energy-efficient options for cost-effective and environmentally-friendly heating.

Each of these boiler types has its own set of advantages and disadvantages. Understanding the key differences can help homeowners make the best choice for their specific needs and budget. Installation fees may vary depending on the job's complexity and location.

Boiler Replacement Costs

When considering a boiler replacement, it is essential to be aware of the various costs involved. Upgrading your current boiler to a new gas boiler can come with expenses associated with its price, installation, and any additional features or adjustments required.

The average cost for a new boiler in the UK ranges between £600 and £2,500. However, when including installation fees, which can range from £1,500 to £3,500, the total expenditure can be between £2,000 and £4,000. Several factors influence these costs, such as the boiler brand, warranty length, type of boiler, installation complexity, and any extras you may desire.

When replacing a boiler with a like-for-like model, the installation process tends to be simpler and more cost-effective. This is because the system and components are already compatible and in place, requiring minimal adjustments. However, opting for a newer model with improved efficiency and advanced features may necessitate additional work, thus increasing the overall costs.

Considering the running costs of a new gas boiler is crucial. On average, these start at £90 per month but vary depending on the efficiency and usage of your boiler. A major advantage of upgrading to a new boiler is that modern models can achieve over 90% efficiency, while older boilers' efficiency rates can be lower than 50%. This improved efficiency can contribute to considerable savings on energy bills over time.

Ultimately, when weighing up the costs associated with a boiler replacement, it is essential to consider the initial investment, installation fees, and potential running costs. By prioritising efficiency, you can expect long-term savings and enjoy the benefits of a reliable and eco-conscious heating system.

The Role of Brands in Installation Cost

Regarding new gas boiler installations, your chosen brand significantly affects the overall cost. Some well-known boiler manufacturers, such as Ideal, Worcester Bosch, and Viessmann, offer high-quality products trusted by professionals and homeowners alike.


Although the price of the boiler itself is an essential factor to consider, other elements also contribute to the installation cost. Different boiler brands offer varying warranty lengths, materials used in construction, and after-sales support. These factors can impact the overall value of performance, longevity, and customer satisfaction.

Some of the top boiler brands include:

  • Ideal: Known for their Efficiency and Reliability, Ideal has an extensive range of combi, system, and conventional gas boilers for both domestic and commercial customers. Their products are generally regarded as cost-effective solutions without compromising on quality.

  • Worcester Bosch: This brand is highly regarded for its robust and durable boilers. Renowned for their Greenstar range, Worcester Bosch offers long warranty periods and extensive after-sales support, making them a popular choice among homeowners and engineers.

  • Viessmann: Often praised for their technologically advanced boilers, Viessmann stands out with their innovative approach. Their sleek designs and energy-efficient models have attracted many customers looking to upgrade their home heating systems.

In conclusion, the brand you choose for your new gas boiler can significantly impact the installation cost. It's essential to balance the initial price with the quality, performance, and after-sales support the manufacturer provides. 

By doing a thorough research and comparing quotes from multiple installers, you can make an informed decision to maximise the return on your investment.

Considerations for Upgrades and Extras

When planning the installation of a new gas boiler, homeowners must consider the various upgrades and extras that will impact the overall cost. 

Always consider what size kW boiler you would need as the price does vary for each size. Take a look at our handy boiler kw size calculator tool for a good estimate on the size you would need for your home.

This can include hot water cylinders, water storage tanks, thermostats, pipework alterations, magnetic filters, and more. Having a clear understanding of these factors will ensure an effective and efficient boiler installation process.

Firstly, upgrading the existing hot water cylinder or installing a new one may be necessary alongside the new gas boiler. 

Hot water cylinders are crucial in providing a constant hot water supply for homes with multiple bathrooms or high hot water demands. However, replacing a water cylinder can add to the overall expense, so it is essential to budget accordingly.

Secondly, water storage tanks might require upgrading or replacement. Modern boilers are more efficient, so the existing storage tank may not match the new system's requirements. Upgrading the water storage tank will ensure the entire heating system functions correctly and efficiently.

Thirdly, installing a new thermostat can significantly improve the heating system's energy efficiency. A wide variety of thermostats are available, including smart controls that allow for remote heating system management. Investing in a high-quality thermostat will provide better control and help reduce energy bills.

Fourthly, any alterations to the existing pipework should be accounted for when calculating installation costs. This may involve moving or replacing sections of pipework, which can be time-consuming and add to the overall expense. Discussing this with the installer is crucial to avoid unexpected costs later.

Finally, adding a magnetic filter to the new gas boiler installation is an excellent measure to protect the system from debris and sludge. This will increase the lifespan of the boiler and improve its efficiency. Although this is an optional extra, it is still worth considering due to its long-term benefits.

Considering these factors when planning a new gas boiler installation will ensure a smooth process, an efficient heating system, and a better understanding of the overall costs. Remember always to obtain multiple quotes from accredited professionals to get the best deal without compromising on quality or safety.

Efficiency and Energy Bills

When considering a new gas boiler and installation costs in the UK, looking at efficiency and energy bills is crucial. An efficient boiler can significantly affect your energy expenses, as heating and hot water account for over half of what you spend in a year on energy bills.


Energy efficiency in a boiler is directly linked to savings in energy bills. Modern, well-maintained boilers tend to burn fuel efficiently, whereas older or poorly maintained models may sometimes operate with lower efficiency levels - even below 50%. By contrast, installing a new energy-efficient boiler can lead to efficiency levels greater than 90%, translating directly into cost savings for the homeowner.

Multiple factors can impact the efficiency of a boiler, such as the brand, type of boiler, and installation complexity. Proper maintenance and timely servicing are essential for maintaining high efficiency and prolonging the lifespan of your boiler, which typically ranges between 10 to 15 years.

Additionally, the energy source used by the boiler plays a role in its efficiency and overall cost. Gas boilers are usually more energy-efficient than other alternatives, such as electric or oil boilers. Therefore, investing in a new gas boiler may lead to greater energy savings in the long run.

When selecting a new boiler, it is vital to consider energy-efficient models that adhere to the UK's energy efficiency standards. These models not only help reduce energy bills but also contribute to a more environmentally friendly approach to heating your home.

In summary, prioritising boiler efficiency while considering a new gas boiler and installation costs in the UK is crucial. With higher efficiency, homeowners can enjoy reduced energy bills and a more environmentally sustainable heating system. Careful consideration of boiler types, brands, and proper maintenance practices will help ensure optimal boiler efficiency and long-term savings.

Heat and Hot Water Demand

When considering a new gas boiler and installation in the UK, it's essential to account for your household's heat and hot water demand. 

Various factors, such as the number of bathrooms, bedrooms, and radiators, contribute to the heat and hot water demand.

The number of bedrooms and bathrooms plays a significant role in determining the size and capacity of the boiler needed. For instance, a household with more bedrooms and bathrooms will require a larger boiler to adequately supply hot water and heat the rooms. Assessing the number of radiators in your home is also crucial in calculating the output required from your new gas boiler.

Besides the number of bathrooms, bedrooms, and radiators, water pressure plays a substantial part in your hot water system's overall comfort and efficiency. Low water pressure can result in poor performance when using multiple simultaneous hot water outlets, such as showers and taps. 

A combi boiler might be the right choice for homes with lower hot water demand, as it only heats water when needed. However, homes with high hot water demand may benefit from a system or regular boiler paired with a hot water cylinder.

To sum up, evaluating factors like hot water usage, the number of bathrooms and bedrooms, radiators, and water pressure will help determine the most suitable gas boiler and installation for your UK home. 

By doing so, you can ensure an energy-efficient system that meets your household's heating and hot water requirements.

Gas Safety Regulations and Peace of Mind

When installing a new gas boiler, it is essential to consider gas safety regulations and adhere to them strictly. An essential requirement in the UK is to ensure that only Gas Safe registered engineers perform the installation. This guarantees that the work complies with the Gas Safety (Installation and Use) Regulations 1998, ensuring complete peace of mind.

When selecting a new boiler, warranty length is vital in providing additional peace of mind. Different boiler manufacturers offer varying boiler warranty lengths, so paying heed to this detail is essential. Warranty length may range from 2 to 10 years, depending on the brand and model. 

A longer warranty length is desirable as it covers the cost of repairs or replacement in case of boiler malfunction or failure. Ensuring that your boiler is installed and maintained by Gas Safe registered engineers; otherwise, you might invalidate the warranty.

It's not only the boiler warranty length that contributes to peace of mind, but also the guarantee provided by the Gas Safe registered engineer. This guarantee ensures that all work carried out meets the necessary safety standards. 

If anything goes wrong due to faulty workmanship, the engineer must rectify the problem at their expense. Always ensure that you receive a written guarantee from the installer to avoid any misunderstandings in the future.

Adhering to gas safety regulations and selecting a boiler with an appropriate warranty length ensures your heating system functions smoothly and efficiently. When you employ Gas Safe registered engineers, you can rest assured that the installation and maintenance work will be carried out meticulously and professionally. 

Ultimately, following these guidelines will result in a safe and reliable boiler, providing you with maximum peace of mind in your home.

Converting from Other Types of Boilers

When considering a boiler upgrade or replacement, it may be necessary to convert from one type of boiler to another. This could involve switching from an LPG or biomass boiler to a more modern, efficient gas boiler. This section will briefly discuss the process and costs of such a conversion.

Converting from an LPG boiler to a gas boiler is relatively straightforward. It generally involves replacing the LPG boiler with a gas-compatible boiler and connecting it to the gas main, if not already.

The cost of this conversion will depend on the new boiler chosen and installation fees, which can range from £1,600 to £2,500 for a combi boiler, and £1,700 to £2,000 for a regular boiler. Additional costs may be incurred if a new gas connection is needed.

Switching from a biomass boiler to a gas boiler is more complex. This conversion requires removing the existing biomass boiler and associated equipment, such as fuel storage. Additionally, a new gas connection may be necessary if one is not already in place. 

Costs for this conversion are generally higher due to the complexity of the process and the need for additional infrastructure. Expect to pay around £2,000 to £4,000 for the supply and installation of a new gas boiler, plus any additional costs for gas connection and decommissioning of the existing biomass system.

It's worth noting that both LPG and biomass boilers have higher running costs compared to gas boilers. Converting to a gas boiler can result in significant savings in the long term due to lower energy bills and reduced maintenance costs. 

Furthermore, modern gas boilers are more efficient, with efficiency ratings often exceeding 90%, while older LPG and biomass boilers can have efficiency ratings below 50%.

In conclusion, converting from an LPG or biomass boiler to a gas boiler can be a cost-effective solution for homeowners seeking improved energy efficiency and reduced running costs. 

The initial investment in the conversion process will be offset by long-term savings in energy bills, with the added benefit of a more eco-friendly heating system.

Labour and Fitting Costs

Regarding boiler installation, labour and fitting costs significantly determine the overall expense. It is essential to consider these factors as they can greatly affect the price of a new gas boiler and its installation in the UK.


On average, the labour cost for boiler installation ranges from £500 to £1,000. This variation depends on geographical location, the installer's experience, and the job's complexity. 

Additionally, fitting costs can be subject to the type of boiler, its brand, and any necessary extras, such as power flushing or upgrading the heating controls.

Boiler installations usually require the expertise of a Gas Safe registered engineer. Their fees generally depend on their experience level and the region where the installation occurs. 

For example, the installation costs in London will likely be higher due to increased demand and living expenses. Obtaining quotes from multiple engineers is important to clearly understand your area's competitive rates.

There are a few steps involved in a typical boiler installation process, contributing to the labour and fitting costs:

  • Removing the old unit

  • Installing the new boiler and flue system

  • Adjusting or upgrading the central heating controls

  • Performing a power flush on the heating system, if necessary

These steps, along with the time taken for installation, influence the final cost. Generally, the process takes anywhere from a day to three days, depending on the complexity of the job and the installer's efficiency.

To summarise, labour and fitting costs for a new gas boiler and its installation in the UK are influenced by various factors, such as the location, the installer's experience, and the specific boiler system requirements. 

By obtaining multiple quotes from different professionals, you can compare prices and make an informed decision that suits your budget and home requirements.

Cost of Repairs vs New Installation

When considering boiler repairs, it's crucial to weigh the costs of repairing an older boiler against the cost of installing a new, more efficient one. It is not uncommon to receive a repair quote that may seem steep; however, you must consider the potential energy savings and increased efficiency that a new boiler could offer.

Boiler repairs typically cost between £100 and £500, with an average price of around £300, including parts. 

The repair cost will depend on several factors, such as the issue's complexity, labour rates, and components required for the fix. In certain cases, the expense of repairing a boiler can rival that of a new installation, making replacement a more viable option.

On the other hand, the cost of a new boiler installation ranges from £2,000 to £4,000, depending on several factors. These factors include the type of boiler, brand, warranty length, and installation complexity. 

You may expect increased efficiency with a new boiler, with high-quality boilers achieving greater than 90% efficiency. In contrast, older models can operate below 50% efficiency, leading to higher energy bills.

There are a few aspects to consider when deciding between repairing an existing boiler and replacing it with a more modern system:

  • Lifespan: Most boilers have a life expectancy of 10 to 15 years; therefore, if your boiler is nearing the end of its life, a new installation might be a better long-term investment.

  • Frequency of repairs: If your boiler frequently requires repairs, then it's worth considering investing in a new installation to save on future repair costs.

  • Energy efficiency: A new boiler may significantly reduce energy consumption, resulting in lower monthly bills compared to an older, less efficient system.

In conclusion, it's essential to carefully examine the costs and efficiency of repairing your current boiler against the potential benefits of a new boiler installation. If your boiler is frequently malfunctioning and nearing the end of its lifespan, a new energy-efficient system could be a more sensible investment in the long run.

Calculate Your Boiler Installation Cost

A boiler installation cost calculator can be helpful When estimating the cost of a new gas boiler and its installation. 

These calculators consider various factors to estimate the cost of purchasing and installing a new boiler.

The cost of a new boiler and installation in the UK varies widely, with the average price ranging from £1,600 to £2,500 for a combi boiler, £1,700 to £2,000 for a regular boiler, and £1,900 to £2,200 for system boilers. These figures include both the boiler and the installation costs. A boiler installation cost calculator can be used to simplify the process and obtain a more accurate estimate.

A boiler cost calculator allows you to compare boiler prices from various brands and suppliers, giving you a clearer understanding of the overall costs. 

By inputting information about your home, such as the type of fuel, property size, and the number of bathrooms, the calculator generates an estimate tailored to your needs. It is essential to compare multiple quotes from different installers to ensure you are getting the best value for your money.

The average costs mentioned above are worth considering when using a boiler installation cost calculator. However, it is crucial to remember that these are just estimates. Factors such as the brand, warranty length, type of boiler, installation complexity, and any additional features can significantly impact the final cost.

In conclusion, a boiler installation cost calculator is a convenient way to estimate the expenses of upgrading your home's heating system. 

By comparing various boiler prices and taking note of average costs, you can clearly understand the budget needed for this important home improvement project. Consider multiple quotes and factor in any potential additional costs for a comprehensive and accurate assessment.

Best Boiler Brands: Vaillant, Viessmann, Alpha, Ideal, Worcester Bosch

Selecting the right boiler brand is pivotal for ensuring efficiency, reliability, and longevity in home heating. Among the myriad of options, brands like Vaillant, Viessmann, Alpha, Ideal, and Worcester Bosch distinguish themselves with innovative technology and customer satisfaction. Below is an in-depth comparison of these brands, focusing on their standout models and unique industry positions.

Comparative Analysis of Standout Models


Standout Model

Energy Efficiency

Unique Features

Environmental Impact


ecoTEC Plus


Eco-friendly, quiet operation

Reduced carbon emissions


Vitodens 100-W


Compact design, smart compatibility

Low emissions technology


E-Tec Plus

High efficiency

Compact, cost-effective

Energy-saving operation


Logic Plus


User-friendly, easy installation

Efficient energy use

Worcester Bosch

Greenstar i


Robust build, smart controls

Eco-conscious design


Vaillant's eco-friendly ethos shines in their ecoTEC range, particularly the ecoTEC Plus and ecoTEC Exclusive models. These boast top-tier energy efficiency and reduced carbon footprints. They're known for quiet operation and user-friendly controls, making them a harmonious blend of performance and environmental responsibility.


Viessmann's Vitodens series, especially the 100-W and 200-W, are hallmarks of high-efficiency and technology. These models feature compact designs and stainless steel Inox-Radial heat exchangers for durability. Advanced features like smart thermostat compatibility offer enhanced control and user convenience.


Alpha Heating Innovation's E-Tec range, particularly the E-Tec Plus, offers a fine balance between affordability and quality. Notable for their impressive energy efficiency and compact size, these boilers are suitable for various home types, making them an ideal choice for straightforward, efficient heating solutions.


Ideal Boilers, especially the Logic Plus range, are lauded for their reliability and value. These boilers stand out with their efficiency, user-friendly interface, and compactness, favoured for their ease of installation and maintenance. They come with comprehensive warranties, offering peace of mind and reliability.

Worcester Bosch

A leader in the market, Worcester Bosch is synonymous with quality and reliability. The Greenstar range, including models like Greenstar i, Si, and CDi, is known for its efficiency and robust build quality. These boilers blend innovative features such as smart thermostat compatibility with user-friendly controls, making them a top choice in many homes.

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Frequently Asked Questions

How much should it cost to fit a boiler?

The cost of fitting a boiler can vary based on factors such as brand, warranty length and boiler type. On average, a new boiler may cost between £600 and £2,500, while a new boiler installation ranges from £1,500 to £3,500. Keep in mind that installation costs can differ depending on your location, the complexity of the job, and any additional parts needed.

How much does labor cost to install a boiler?

Labour costs can vary depending on where you live in the UK and the complexity of the installation process. Typically, labour costs for boiler installations can range from £500 to £2,000 or more. It's important to get a few quotes from trusted engineers to get an accurate labour cost estimate.

How much does it cost to install a boiler in a house?

The cost of installing a boiler in a house depends on factors such as the size of your property, the type of boiler you're installing and the complexity involved. Costs range from £1,500 to £3,500 on average, but can be higher or lower depending on your specific circumstances.

How do I calculate the cost of my boiler?

To calculate the cost of your boiler, you can use boiler installation cost calculators, like those found online. They typically take into account the brand, boiler type, warranty length, and installation complexity. Be sure to gather all necessary information before using a calculator for an accurate price estimate.

How much does it cost to have a system boiler installed UK?

System boiler installations in the UK can have a wide range of costs. The average price is between £2,000 and £4,000, but it can vary depending on factors such as the boiler brand, warranty length, and any additional parts needed. Remember, installation costs may differ based on your location and the complexity of the job.

What are the running costs of gas combi boilers in the UK?

The running costs of gas combi boilers in the UK will depend on factors such as the size of the property, boiler energy efficiency, and gas prices. In general, an energy-efficient gas combi boiler may cost between £500 and £1,000 per year to run; however, you can save on running costs by insulating your home and using energy-saving features when available.

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Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.