How Much For a New Combi Boiler Fitted? A Comprehensive Guide

May 18, 2023

If you're considering upgrading your home's heating system, a combi boiler can be an efficient and space-saving option. Combi boilers, also known as combination boilers, provide hot water for both heating and hot water in a single unit, eliminating the need for a separate water tank.

Installing a new combi boiler in your home can be a great way to improve energy efficiency, reduce your carbon footprint, and lower your monthly energy bills. But one of the most common questions homeowners have is how much a new combi boiler installation will cost. In this article, we'll take a closer look at what factors can affect the cost of a new combi boiler installation and provide some tips for getting the best value for your investment.

But first, what is a Combi Boiler?

Before we dive into the costs of installing a new combi boiler, it's important to understand what a combi boiler is and how it works. A combi boiler, or combination boiler, is a highly efficient type of central heating system that provides both hot water and heating to your home from a single unit. They work by heating water directly from the mains, rather than relying on a separate hot water storage tank, which means they can provide hot water on demand and save space in your home.

Combi boilers are by far the most popular choice for British homeowners, given the increased efficiency, space savings, and ease of use it’s easy to see why.

But how much does a new combi boiler fitted cost? In this comprehensive guide, we'll explore the factors that can affect the cost of a new combi boiler installation.

  1. Boiler Cost: The price of the combi boiler itself is a significant factor in the overall cost of installation. Combi boilers are available in various brands, models, and sizes, and their prices can vary significantly. Higher-end boilers from reputable brands may come with advanced features and better warranties, but they can also be more expensive, anywhere from £1000 - £2000+ for a top end boiler. It's important to balance your budget with the quality and efficiency of the boiler to ensure a wise investment.
  2. Installation Cost: The cost of installing a new combi boiler can vary depending on the location and experience of the heating engineer or installation company. Installation costs typically include removing the old boiler (if applicable), installing the new boiler, connecting it to the existing pipework, and testing for proper operation. Installation costs are usually anything from £500 - £1000. Some installations may require additional work, such as modifying or upgrading the pipework, which can increase the cost. It’s also important to remember that whether you’re using a large national company, or a one man band sole trader the cost of the installation isn’t direct profit and it’s not going straight into the installer's pocket. Even sole traders will need to pay for Gas Safe registration, public liability insurance, vehicle insurance, vehicle maintenance, fuel, tools, phone bills, staff, call centres, websites etc. If you’re using a professional and reputable company who can offer you peace of mind and a professional service, there are often signifcant costs associated with just getting the engineer to your home.
  3. Additional Materials: In addition to the boiler and installation costs, there may be additional materials required for the installation, such as pipes, fittings, controls, and flues. Typically anywhere from £250 - £1000 the cost of these materials can vary depending on the type, length, and quality of the materials needed. For example, if your home requires a longer flue or your home insurance specifies specialised fittings, it may increase the overall cost of the installation. Likewise if you prioritise energy efficiency and opt for a top end control, the cost will increase significantly.
  4. Certifications and Permits: Installing a new combi boiler will require certifications or permits to comply with local building codes and regulations. These can include Gas Safe certifications, small electrical works certificates, and building regulations certifications. The cost of obtaining these certifications or permits should be factored into the overall cost of the installation.
  5. Additional Factors: Other factors that can affect the cost of a new combi boiler installation include the size of your home and its heating requirements, the complexity of the installation, and regional installation rates. For example, larger homes may require more powerful boilers, which can be more expensive. If your installation requires significant modifications to the existing pipework or if your home has unique heating requirements, it may increase the overall cost of the installation. The type of system clean you get to protect your new boiler, and its warranty can range from free, to £1500. Regional installation rates can also vary, with higher rates in urban areas or regions with higher living costs.

To get an accurate estimate for the cost of a new combi boiler fitted, it's recommended to obtain quotes from multiple reputable heating engineers or installation companies. They can assess your specific needs, provide you with a detailed estimate, and answer any questions you may have. When comparing quotes, be sure to consider the quality and efficiency of the boiler, the qualifications and experience of the installer, and any additional materials, certifications, or permits that may be required.

Investing in a new combi boiler can provide you with long-term energy savings and improved heating and hot water performance. However, it's essential to carefully consider the overall cost of installation to ensure that it fits within your budget and provides value for money. By understanding the factors that can affect the cost of a new combi boiler fitted, you can make an informed decision and enjoy the benefits of a reliable and efficient heating system in your home.

Tips for Getting the Best Value for Your Investment

If you're considering installing a new combi boiler in your home, there are a few tips you can keep in mind to get the best value for your investment:

  1. Obtain multiple quotes: To ensure you're getting a fair and competitive estimate, it's important to obtain a couple of quotes from different installers. You don’t want so many that you get confused by all the different options, but it’s nice to compare two or three. Be sure to compare the quotes carefully, looking at the overall cost as well as any differences in the quality of product, how many options each company gives you, how the whole process was from the initial call to actually receiving the written quote, and the equipment or services included.
  2. Consider financing options: If the upfront cost of a new combi boiler installation is too high, consider financing options such as a boiler finance plan. This can help you spread the cost of installation over time, making it more affordable and manageable.
  3. Choose a high-quality boiler: While a higher-end boiler may cost more upfront, it can provide better energy efficiency and last longer, which can save you money on energy bills and reduce the need for costly repairs and replacements in the future.
  4. Choose a qualified and experienced installer: Proper installation is crucial for the safe and efficient operation of your combi boiler, so it's important to choose a qualified and experienced installer. Look for installers with certifications such as Gas Safe registration or OFTEC accreditation, and ask for references or reviews from previous customers.


Installing a new combi boiler can be a significant investment, but it can also provide long-term savings in terms of energy efficiency and reduced energy bills. The cost of a new combi boiler installation can vary depending on factors such as the size and type of boiler, the brand and model, the complexity of the installation, and the qualifications and experience of the installer. To get the best value for your investment, it's important to obtain multiple quotes, consider financing options, choose a high-quality boiler, and select a qualified and experienced installer.

If you're in need of a new combi boiler installation, it's best to consult with a professional heating engineer or boiler installation company to assess your specific needs and provide you with an accurate estimate. They can help you choose the right boiler for your home and budget, ensure proper installation, and provide any necessary certifications or permits. Remember that investing in a high-quality boiler and professional installation can result in long-term savings through improved energy efficiency and reduced energy bills, making it a worthwhile investment for your home and comfort.

To ensure that you get the best value for your investment in a new combi boiler for your home. Don't hesitate to seek professional advice and make an informed decision to enjoy the benefits of a new, efficient combi boiler in your home.

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