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  • Best Boiler Replacement Cost

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  • Best Boiler Replacement Cost

    Updated: March 5, 2023

    How much is a new boiler?

    The first thing you might think of when buying a new boiler is the possible cost. Boilers can be expensive but getting a good boiler is a good investment, Best Boiler Replacement Cost .

    To begin with, the cost of a new boiler mostly depends on the installation requirement and the type of home you live in. In addition to any add-ons.

    You will of course want your boiler to be efficient and to last for years to come. We will look into the cost of different kinds of boilers as well as the cost of replacing you boiler with another system.

    Whether you want to know the cost of a combi, a system or a regular boiler, we’re here to help.

    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)

    Without a doubt, replacing you current combi boiler with another is cheaper than converting your system boiler to a combi boiler.

    Converting your boiler requires more time, more labour and more materials. Not to mention how complex the whole process is.

    Which model you pick also plays a huge role in determining the cost for a new boiler. Here at Let’s Heat, we offer some of the best brands in the boiler industry such as Alpha, Worcester Bosch and Viessmann.

    With Let’s Heat you can choose from the multiple ways of payment we offer to our customers. You can pay in cash or get a boiler finance plan that will enable 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 can be seen, many things can affect the price and cost of a combi boiler. However, replacing a combi boiler with another combi is a straightforward job.

    A mid-range combi boiler will probably cost you around £1,800 with a long 10-year warranty. In this case, the Worcester Bosch 2000 boiler is a good example for such a cost.

    Without a doubt, the cost will increase if you’re replacing your current boiler system with another one.

    New Boiler Cost

    system boiler replacement cost

    Replacing a system boiler with a combi boiler ranges from £2,300 – £3,000.

    A combi boiler takes less space than a system boiler. As a result, you will have more space in your home after you get a combi boiler.

    Replacing a system boiler with a combi boiler is a big job and includes additional work. It might take the installation team 2-3 days to finish the work to be sure.

    A system to combi boiler conversion costs around £2,300 for a basic to a mid-range boiler. And for a higher-end boiler the price would be around £3,000 on the whole.

    A System boiler replacement cost (swap)

    Replcing your system boiler with another system boiler will cost you between £1,600 to £2,900.

    In this case, you would only replace the boiler and not the water tank.

    For a basic boiler with a five-year warranty, the cost would be around £1,600.

    A mid to high-end system boiler replacement might cost you £1,900 to £2,900 depending on the model and manufacturer.

    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

    To begin with, you can’t replace a back boiler with another one because of some regulations.

    It’s ok to use an existing back boiler but you can’t install a new one.

    They are expensive to run, unreliable and dirty.

    Most people usually replace their back boilers with combi boilers.

    Back boiler to combi boiler costs

    For a budget combi boiler with a low warranty you would pay £3,100 to £3,200. And for a mid to high range combi boiler you could pay £3,500.

    You will need a boiler flue, a waste condensate pipe. Thus, the additional cost.

    This kind of investment is certainly worth it. Moreover, a combi boiler would 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.

    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 your boiler can cost more money. It will involve several new fittings and fixtures, as well as extra pipework, and a lot of physical labour.

    We advise you to avoid relocating your boiler unless you have to. You might need to relocate your boiler if you’re replacing a back boiler with a combi, a system or a regular boiler.

    Moving your boiler from the kitchen to the next room might cost you £200. However, moving your boiler from the kitchen to the loft might cost around £400 to £600.

    New heating controls and smart thermostat cost

    Best Smart Thermostats In The Uk In 2022

    Presently, you can turn off and on your boiler easily using a controller or your smartphone.

    The average price for a controller is between £30 and £300.

    In short, smart thermostats cost between £100 to £300 depending on the model.

    Plume Kit Cost

    To begin with, a plume kit is an extension kit attached to the flue of the boiler. You will need one if your boiler is too close to your neighbour.

    The average cost of a plume kit for your new combi, regular or system boiler ranges from £75 to £150.

    Chemical flush cost

    A Chemical flush might cost you £50 to £150.

    On the positive side, they help you get rid of sludge from your heating system. If not cleared, sludge can block the hot water from flowing efficiently around your radiators.

    You will need a deep clean if your radiators are cold at the bottom. The most common way to do this is by using a hot, chemical flush.

    But you must be careful. Flushes can do more damage than good. Not to mention that a lot of damage can be caused by forcing high-pressure water through a heating system.

    Boiler flue cost

    To clarify, a boiler flue is a big piece of pipe which leads from the boiler to the outside.

    The flue ensures that the flue gases and condensation are pumped outside and not into your face.

    Of course, flues leaving your home horizontally adds no extra expenses.

    On the other hand, flues leaving your home vertically through your roof require more work and as a result more expenses.

    The typical cost for a flue is between £500 to £20, depending on the length needed and type.

    To sum up, a vertical flue is more expensive than a horizontal flue.

    Magnetic boiler filter cost

    The cost for a magnetic boiler filter ranges from £100 to £200.

    Firstly, filters protect your boiler. They are installed inline on the pipework. They trap small particles of dirt and metal, stopping them from going into the boiler and causing unnecessary 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.

    Which boiler brand to choose from?

    We offer a variety of different boilers from different brands. You can take a look at some of the types we offer down below:

    Viessmann Boilers

    Viessmann boilers have won plenty of awards. They have a reputation for being technically superb.

    With its superb German engineering and simple, crisp designs, it has a 5-star reputation. Needless to say that it dominates the European boiler market.

    Worcester Bosch Boilers

    When it comes to boiler, then rest assured that Worcester Bosch is a household name. It is an award-winning boiler.

    It is the best boiler brand in the UK thanks to their excellent guarantee offer, customer service, and easily sourced parts.

    Alpha Boilers

    Over the last few years, Alpha has increased its share of the market due to it being a budget-option for many customers.

    It is a fantastic option for people who are looking for a reliable yet affordable boiler.

    Can I get the next-day boiler installation?

    Of course you can if you order your boiler before 12 pm during the colder months, and 2 pm in the warmer months.

    This is next-day boiler fitting nationwide in England, Wales and Scotland. So you do not have to be without heating for long, even in the depths of winter.

    Not many boiler companies can fit a boiler at such short notice nationwide. If you need a boiler, get a quote from us as soon as possible.

    About Us

    To begin with, we have helped countless customers replace and improve their heating requirements. What’s more, we’re proud of our work and proud to be the best out there when it comes to heating.

    With Let’s Heat you can rest assured that you will get the best engineers in business. Furthermore, we work with Gas Safe Registered engineers for a better quality of work. Moreover, our boiler installation and repair team is fully qualified and ensured to the highest standards. On the whole, all of our staff at Let’s Heat are experts in their field and have many years of experience. Not to mention that safety is our number one priority.

    We are available 7 days a week to help you get the best boiler service. You can rely on Let’s Heat to do your boiler installation and plumping service.

    We have a vast newtwork of Gas Safe Registered engineers that covers England, Scotland, as well as Wales.


    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.