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  • Best Boiler Replacement Cost

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  • Best Boiler Replacement Cost

    Updated: April 18, 2024

    How much is a new boiler?

    When considering purchasing a new boiler, cost is often a primary concern. While boilers can be a significant investment, opting for a quality unit is a wise decision for long-term efficiency and reliability. Discover the Best Boiler Replacement Cost with us.

    The cost of a new boiler is primarily determined by installation requirements, the type of home you reside in, and any additional features or upgrades.

    Ensuring your boiler is efficient and durable is essential for longevity. We’ll explore the costs associated with various types of boilers and the expenses involved in replacing your current system.

    Whether you’re interested in understanding the cost of a combi, system, or regular boiler, our team is here to provide guidance and assistance every step of the way.

    The price for a new boiler replacement can vary, depending on many crucial elements:

    • The type of boiler you want to install in your house (e.g. combi, system or regular)
    • Moving you boiler to a different location
    • The model you aim to buy (e.g. mid-range vs. premium)
    • Converting your current boiler with another type (e.g. system to combi)
    • The extras you get (e.g. filters, a controller or smart thermostats)

    Undoubtedly, replacing your current combi boiler with another is more cost-effective than converting your system boiler to a combi.

    Converting your boiler entails additional time, labor, and materials, not to mention the complexity of the entire process.

    The choice of boiler model also significantly influences the overall cost. Here at Let’s Heat, we offer some of the best brands in the industry, including Alpha, Worcester Bosch, and Viessmann.

    We provide multiple payment options for our customers. Whether you prefer to pay in cash or opt for a boiler finance plan, we ensure flexibility to suit your needs, allowing you to pay monthly for your new boiler.

    How much does a new boiler cost?

    Here’s a table of the average prices for boilers:

    New boiler install£2,899
    Combi to combi swap£1,795
    System to system£1,999
    System to combi conversion£2,499
    Back boiler to a combi£3,299
    Megaflo unvented boiler£2,499

    All in all, combi boilers sell for £1,500 to £2,750.  While system boilers can sell for £1,600 – £2,900 and regular or heat only boilers go for for £1800 – £3,200.

    How much does a standalone boiler cost?

    All things considered, it is hard to pinpoint exactly how much a standalone boiler costs. But the range starts from £600 to £2,500.

    How much does a new combi boiler cost?

    combi boiler can cost between £1,500 and £3,000 depending on the model in question. This price includes the following:

    • Firstly, the price of the new combi boiler itself.
    • Secondly, installation cost
    • Lastly, warranty registration

    This is the cost you can expect to pay. It also includes VAT.

    The labour cost can vary, without a doubt, if you want to replace:

    • An existing combi boiler with a combi boiler
    • A system boiler with a combi boiler
    • A regular (heat only) or a back boiler with a combi boiler

    Other factors which might influence the price for combi boilers:

    • The complexity around your boiler flue
    • Amount of new pipework
    • Moving your boiler
    • What floor your boiler is on (scaffolds might be needed in flats)
    • Location inside the UK (London has higher prices)
    • Warranty length

    As evident, several factors can impact the price of a combi boiler. However, replacing one combi boiler with another is typically a straightforward process.

    A mid-range combi boiler might cost approximately £1,800, offering a generous 10-year warranty. For instance, the Worcester Bosch 2000 boiler exemplifies such a cost-effective option.

    Undoubtedly, the cost will rise if you’re replacing your current boiler system with a different one.

    Regular Boilers and how does it works

    system boiler replacement cost

    The cost of replacing a system boiler with a combi boiler typically ranges from £2,300 to £3,000. By opting for a combi boiler, you can benefit from its space-saving design, which frees up additional space in your home.

    The process of replacing a system boiler with a combi boiler is a significant undertaking and involves additional work. It is estimated that the installation team will require 2-3 days to complete the job thoroughly.

    The cost of a system to combi boiler conversion starts at around £2,300 for a basic to mid-range boiler. If you prefer a higher-end boiler, the price would be approximately £3,000 in total.

    A System boiler replacement cost (swap)

    The cost of replacing your existing system boiler with another one can vary significantly, typically ranging between £1,600 and £2,900. This estimate covers the expenses associated with replacing the boiler unit itself, without including any changes to the water tank.

    If you’re looking for a basic system boiler with a warranty lasting five years, you can expect to spend around £1,600.

    On the other hand, a higher-end system boiler replacement, featuring advanced features and manufactured by a reputable brand, could cost you anywhere from £1,900 to £2,900, depending on the specific model andmanufacturer.

    Regular boiler replacement cost and prices

    Firstly, a regular boiler replacement can cost around £1,900 to £2,200.

    The price does not cover a new hot or cold water tank. You do not need to pay for a new water tank because, in most cases, they last for long.

    For one thing, a budget boiler with a low warranty could start at £1,900. Whereas a mid to high-end heat only boiler with a good length warranty might cost £2,200.

    Regular conversion to combi boiler cost and prices

    Converting you regular boiler to a combi boiler would probably cost £2,300 – £2,500.

    Your water tank will be removed since there is no need for it any longer.

    And sometimes the cold water tank will be left in its place due to the difficulties of removing it.

    You would pay £2,300 for a basic boiler, with a low warranty. For a mid-range boiler and some higher-end boilers you might pay £2,500.

    Back boiler replacement costs and prices

    It’s important to note that regulations typically prohibit the replacement of a back boiler with another one. Therefore, installation of new back boilers is not allowed.

    Back boilers are known for being expensive to operate, unreliable, and environmentally unfriendly.

    Many homeowners choose to replace their back boilers with combi boilers instead.

    Back boiler to combi boiler costs

    For a budget-friendly combi boiler with a limited warranty, the cost would range from £3,100 to £3,200. For a mid to high-end combi boiler, the price could be around £3,500.

    In addition to the boiler itself, you would also need to consider the cost of a boiler flue and a waste condensate pipe.

    Investing in a combi boiler is usually worthwhile, as it offers improved efficiency and can potentially increase the value of your home.

    The average cost of a new boiler

    Here’s a table of the average cost of a new boiler installed and fully working:

    Type of boilerAverage cost
    regular (heat only) boiler£2,100
    Average system boiler£1,950
    Average combi boiler£1,800
    Average Megaflo£1,900

    Gas boiler costs

    The price for a mid-range, gas combi boiler will be around £1,800. While a mid-range gas system boiler might be around £1,950. Lastly, a regular (heat only) gas boiler will be around £2,100 on average.

    Of course, the prices we just mentioned include the cost of installation and any other additional work needed.

    Boiler Installation in

    How long would a boiler last?

    A new boiler should at least last for 10 years. But the expected lifespan for a boiler is from 10 to 15 years working at high efficiency.

    Boiler relocation costs

    Relocating a boiler can be a more expensive endeavor as it involves additional fittings, fixtures, extra pipework, and substantial physical labor.

    We recommend avoiding boiler relocation unless it is absolutely necessary. Situations where relocation may be required include replacing a back boiler with a combi, system, or regular boiler.

    The cost of moving your boiler from the kitchen to an adjacent room might be around £200. However, relocating your boiler from the kitchen to the loft could cost approximately £400 to £600.

    New heating controls and smart thermostat cost

    Currently, managing your boiler’s operations is convenient, whether through a controller or a smartphone app.

    Controllers typically range from £30 to £300.

    In contrast, smart thermostats vary in price from £100 to £300, depending on the model.

    Plume Kit Expenses

    A plume kit serves as an extension attached to the boiler’s flue, necessary if your boiler is situated too close to neighboring properties.

    Plume kits for combi, regular, or system boilers generally cost between £75 and £150.

    Chemical Flush Investment

    Investing in a chemical flush may range from £50 to £150.

    These flushes effectively eliminate sludge from your heating system, which can otherwise impede efficient hot water circulation in your radiators.

    For radiators exhibiting cold spots at the bottom, a thorough cleaning, often via hot chemical flush, is recommended. However, caution is advised as improper flushing can cause damage.

    Boiler Flue Expenditure

    The boiler flue, a significant pipe directing exhaust gases outside, is essential for safety.

    Horizontal flue installation typically incurs no additional expenses.

    Conversely, vertical flues, requiring more intricate installation, entail higher costs. Prices for flues range from £500 to £20, depending on length and type, with vertical flues being more expensive than horizontal ones.

    Magnetic Boiler Filter Cost

    Magnetic boiler filters, vital for protecting boilers by trapping dirt and metal particles, typically cost between £100 and £200.

    Installed inline on pipework, these filters prevent debris from entering the boiler, minimizing potential damage and leaks.

    Prices for different boiler brands

    Combi boilers

    • Baxi £880 – £1,000
    • Glow Worm £700 – £990
    • Ideal £590 – £1,270
    • Potterton £650 – £1,350
    • Vaillant £1,160 – £1,410
    • Viessmann £780 – £1,280
    • Worcester Bosch £800 – £2,460

    Heat only boilers

    • WORCESTER-BOSCH GREENSTAR UTILITY 50 – 70 (OIL)– £1,700 – £1,900
    • GREENSTAR FS 42CDI REGULAR – £1,500-£1700
    • WB GREENSTAR 30CDI REGULAR -£1,200-£1,300
    • VAILLANT ECOTEC PLUS 428 – £800 – £900
    • ECOTEC PLUS 415– £600-£800

    What are the types of gas boiler replacement?

    If you’re getting a new boiler, then you should know that there are three major types:

    Combi boilers

    • Their compact design makes them perfect for homes with limited space
    • Do not require a hot water storage cylinder or a cold-water tank
    • Unsuitable for homes larger homes with multiple bathrooms and a high demand for hot water
    • Not suitable for areas with low mains water pressure

    Regular (heat only) boilers

    • Good for homes with multiple bathrooms and a high hot water demand 
    • Perfect for areas with low water pressure from the mains
    • Suitable for homes with older heating systems that may not be able to tolerate high pressure
    • They take space since they need a cistern tank
    • A tank in the attic can freeze in winter and might cause many problems if it starts leaking

    System boilers

    • Also recommend for homes with more than one bathroom and a high demand for hot water
    • Do not need a tank in the attic
    • Internal components can make installation much easier.
    • Unsuitable for areas with low water pressure 
    • Not suitable for homes with traditional heating systems that can’t tolerate high water pressure 
    • You need to consider where to put the water tank if a system boiler is replacing your combi boiler.
    Emergency Boiler Repair

    Which boiler brand to choose from?

    Worcester Bosch: Worcester Bosch is a highly regarded brand known for its reliability and energy-efficient boilers. They offer a range of models suitable for different heating systems.

    Vaillant: Vaillant is another reputable brand with a long history in producing reliable and efficient boilers. They provide a wide range of models, including combi boilers, system boilers, and regular boilers.

    Baxi: Baxi is a well-established brand that offers a variety of boilers known for their efficiency and durability. They have a range of options suitable for different heating needs.

    Viessmann: Viessmann is a German brand known for its high-quality boilers and innovative heating solutions. They offer a comprehensive range of boilers designed for efficiency and long-term performance.

    Ideal: Ideal is a popular brand known for its affordable yet reliable boilers. They provide a range of models suitable for different property sizes and heating systems.

    When choosing a boiler brand, it’s crucial to consider factors such as the size of your property, your hot water demands, fuel type (gas, oil, electric, etc.), and any specific features or requirements you may have.

    About Us

    At Let’s Heat, we’ve assisted numerous clients in upgrading and enhancing their heating systems. We take pride in our work and are dedicated to delivering top-notch heating solutions.

    Rest assured, with Let’s Heat, you’re getting the finest engineers in the industry. Our team comprises Gas Safe Registered professionals, ensuring superior work quality. Additionally, our boiler installation and repair specialists are fully certified and insured to meet the highest standards. Each member of our staff is a seasoned expert in their respective field, prioritizing safety above all else.

    We’re available seven days a week to provide exceptional boiler services. Count on Let’s Heat for your boiler installation and plumbing needs.

    Our extensive network of Gas Safe Registered engineers spans across England, Scotland, and Wales, ensuring comprehensive coverage.


    How much does it cost to swap out a boiler?

    combi boilers sell for £1,500 to £2,750.  While system boilers can sell for £1,600 – £2,900 and regular or heat only boilers go for for £1800 – £3,200.

    How often should a boiler be replaced?

    he average boiler lasts around 15 years if well maintained and although a yearly service can improve the lifespan, an older boiler has to work harder to heat your home.

    How much does it cost to install a replacement boiler?

    The most affordable boiler for most UK households is a new combi boiler, costing £500 – £3,000; or a conventional boiler

    When is the best time to get a new boiler installation?

    There’s not always a right time. However, if you’re planning on replacing yours before it completely packs up, then it is recommend that you do it during the summer months. Summer time is the best because you will be less reliant on heating and hot water so the process should be pain free.

    What does installing a new boiler involve?

    After the installation of your new boiler, you should make sure that the heating engineer provides you with a Building Regulations Compliance certificate. This certificate confirms that the unit has been safely installed, and that the installation of your boiler has been registered with the manufacturer to validate the warranty as well. Most manufacturers request that this takes place within 30 days of installation.
    In order to keep your warranty valid, your boiler should be serviced annually by a Gas Safe registered engineer. This means that they will inspect your boiler inside and out, checking the flue pipe, ensuring that the gas pressure is correct and checking how the boiler performs during operation.