New Boiler Replacement & Installation Costs

Boiler Service

The process of buying a new boiler replacement can be daunting at first. What type of boiler do you need? Which is the best boiler brand? How much does a new boiler cost? How do you find the best boiler prices?

Luckily, new boiler replacement is our favourite subject here at Boiler Guide! Here we take you through the big decisions you need to make and what you can expect in terms of the cost of new boiler installation. To kick things off, here are some typical boiler prices (excluding the cost of installation) for the leading boiler brands.

Manufacturer Price
Glow-worm From £560 to £980
Ideal From £700 to £1,050
Potterton From £700 to £1,050
Baxi From £730 to £830
Vaillant From £800 to £1,450
Worcester Greenstar From £1,300 to £2,100

These are general boiler price ranges but there are lots of factors which will affect the cost of your boiler replacement. For example, the type of heating system and boiler you have will increase or decrease the price. Generally, replacement combi boilers cost the least and regular boilers are the most expensive.

  • Combi boilers are all-in-one units which are fed water directly from the mains supply and produce hot water for taps and radiators on demand.
  • System boilers are also fed water from the mains supply and will supply your radiators with hot water, but they need a hot water cylinder to be able to provide hot water for domestic use.
  • Regular or traditional boilers require a tank of cold water in the loft for their water supply. The boiler provides hot water for heating but needs a separate hot water cylinder to produce hot water for domestic use.
  • Find out more about types of boilers.


    Do you need a new boiler replacement

    As boilers age, they can become inefficient and sometimes very unreliable. This leads to more and more frequent breakdowns and eventually a new boiler replacement is the only option. Replacing a boiler is not cheap so it’s best to be sure that it is the right move before going ahead, but it can often turn out to be more cost effective in the long term. If you are not sure if you need a boiler repair or boiler replacement, find a local heating engineer for professional advice.

    Here are the biggest signs that you should be considering a boiler replacement.

  • Your boiler is beyond economical repair, i.e. it would cheaper to replace the boiler than to repair it.
  • The boiler is over 8 years old. Boilers have an average lifespan of 10-15 years but can often start to lose efficiency after 8 years. If your boiler is approaching this age, it could be best to replace it before it breaks down and you’re left without heating and hot water. Old boilers are also less efficient and may be making your heating bills unnecessarily expensive.
  • You are unhappy with where your boiler is located in the home. Moving a boiler can be costly and it may not cost much more to upgrade to a more energy efficient model at the same time.
  • The boiler doesn’t produce enough hot water to heat all of your radiators and hot water demand. You may need a higher output of boiler and/or a hot water cylinder.
  • Your boiler has a low energy efficiency rating (not A rated) and is costing you a lot of money to run.
  • You are planning to sell or rent out your property. An A rated boiler should improve the energy rating of your home which can make it more attractive to potential buyers/tenants.
  • Older boilers can pose a danger if there’s a risk of a gas leak or exposure to carbon monoxide poisoning. It’s important to note that even new boilers require maintenance and annual servicing by a Gas Safe engineer to ensure they are working effectively, efficiently and safely.
  • So replacing your old boiler could reduce your energy bills, improve your comfort, make your home safer, lower your carbon footprint and make your property more attractive to potential buyers.
    Sounds good, but how much does a new boiler replacement cost?

    How much is a new boiler?

    The typical cost of a standalone boiler replacement (excluding installation) will range from £700 to £2,500, but the boiler price will depend on the brand of boiler, type and size of boiler you need to provide adequate heat and hot water for your home.

    We’ve put together a list of popular boiler manufacturers and models with their typical boiler prices. Approximate boiler prices are shown for both the boiler by itself (with VAT) and the potential total cost including installation.

    Vaillant Boiler Costs

    Boiler Make & Model Suitability Typical Cost of Boiler Approximate Fitted Price*
    Vaillant ecoTEC Plus 937 combi Large properties with multiple bathrooms £1400 £2000 – £2500
    Vaillant ecoTEC Exclusive 832 combi 3 bedrooms, 1 ensuite £1300 £1800 – £2300
    Vaillant ecoTEC Pro 24 combi 2-3 bedrooms, 1 bathroom £870 £1330 – £1830
    Vaillant ecoTEC Pro 28 combi 2-3 bedrooms, 1-2 bathrooms £1000 £1420 – £1920
    Vaillant ecoTEC Plus 612 system Small flat £820 £1260 – £1760
    Vaillant ecoTEC Plus 618 system 2-3 bedrooms, 2 bathrooms £950 £1390 – £1890
    Vaillant ecoTEC Plus 637 system Large house with multiple bathrooms £1270 £1740 – £2240
    Vaillant ecoTEC Plus 415 heat only 2 bedrooms £800 £1240 – £1740
    Vaillant ecoTEC Plus 4345 heat only 4-5 bedrooms with multiple bathrooms £1430 £1930 – £2430

    Baxi Boiler Costs

    Boiler Make & Model Typical Cost of Boiler Fitted Price*
    Baxi Duo-tec Combi 33 Gas Boiler £975 £1,475 – £1,975
    Baxi EcoBlue Advance 28 Combi Gas Boiler £1,100 £1,600 – £2,100
    Baxi EcoBlue System 32 Gas Boiler £1,127 £1,627 – £2,127
    Baxi EcoBlue Advance Heat 30 Gas Boiler £985 £1,485 – £1,985

    Worcester Boiler Costs

    Boiler Make & Model Typical Cost of Boiler Fitted Price*
    Worcester Greenstar 30i Combi Gas Boiler £800 £1300 – £1800
    Worcester Greenstar 38CDi Classic Combi Gas Boiler £1,331 £1,831 – £2,131
    Worcester Greenstar 27i System Gas Boiler £981 £1,481 – £1,981
    Worcester Greenstar 24Ri Regular Gas Boiler £900 £1,400 – £1,900

    *Price of installation ranges from £500 – £1000 on top of the cost of the boiler.

    Boiler installation by a local boiler replacement company

    Whether you’re looking for a new boiler replacement or need a whole new central heating system installed, your local heating engineer should be able to carry out the work for you. An experienced heating engineer will need to take a look at your existing boiler and current setup. He will discuss your options and provide you with a quote. To get a competitive price, we recommend you get three quotes and compare all of their advice and prices; don’t just go with the first company.

    Should you decide to go with a local engineer, they will usually purchase the boiler on your behalf directly from a supplier and install your new replacement boiler. Depending on the make and model, the boiler should also benefit from a warranty to give you peace of mind.

    Get quotes from local boiler and heating engineers via our free service. The quotes are free and there’s no obligation. In many cases local engineers will offer a very competitive rate for their services. Prices quoted will vary, depending on the work involved to replace your boiler, but you should expect to pay around £1,500 – £3,500 for the supply and fit of a straightforward boiler replacement.


    How much does boiler installation cost?

    In addition to the buying the boiler itself, you will also need to pay a Gas Safe registered engineer to remove the old boiler and install it in your home. If your gas boiler replacement is straightforward – the gas pipe is an adequate size and the flue will remain in the same place – then a typical all-inclusive price should be in the region £1,800-£3,500.

    The cost of this will depend on the complexity of work involved, i.e. the longer it takes the more you will pay. If the new boiler is to be installed in the same place as your old boiler and is the same type (e.g. combi, system or regular), you will pay less than someone who wants to move their boiler to a new location or wants to change from a regular to a combi boiler.

    Your central heating system will also need to be flushed before the new boiler is installed. This prevents sludge, dirt and debris which has built up in the system over time from contaminating your new boiler and typically costs around £200-£400. You may also need a new TRVs (thermostatic radiator valves) or a magnetic filter to trap sludge, dirt and debris and increase the efficiency of your central heating system.

    Installation costs will vary from installer to installer and the best way to keep costs down is to compare quotes from multiple engineers. Send us an enquiry now and we’ll find you up to 3 free no-obligation quotes from approved installers in your area.

    Cheapest Boiler Prices

    As your source of heating and hot water, your boiler is a very important appliance in your home and, when it comes to boilers, you get what you pay for in terms of performance, reliability and durability. This is why it makes sense to spend as much money as you can afford to when replacing your boiler. Boiler prices can be as low as £500 and if you’re up against a budget, there are several well-known brands which offer quality boiler prices at a more affordable price. Here are some of the cheapest typical boiler prices available based on our research.

    Boiler Make & Model Typical Cost of Boiler Fitted Price*
    Vokera Compact 25A Combi Gas Boiler £545 £1,045-£1,545
    Glow-worm Betacom4 24kW Combi Gas Boiler £525 £1,025-£1,525
    Ferroli Modena 27C Combi Gas Boiler £645 £1,145-£1,645
    Biasi Inovia ErP 25kW Combi Gas Boiler £615 £1,115-£1,615
    Ravenheat WH90 30kW Combi Gas Boiler £525 £1,025-£1,525
    Intergas Rapid 25kW Plus Combi Gas Boiler £590 £1,090-£1,590

    *Price of installation ranges from £500 – £1000 on top of the cost of the boiler.

    Need help with the cost of a new boiler?

    If you receive benefits and meet the eligibility criteria, you may qualify for a free boiler grant towards the cost of a new boiler. To find out if there is funding available and if you could eligible for a grant visit If you do not qualify for a boiler grant, many installers now offer boiler finance deals or pay monthly boilers which will enable you to spread the cost of the boiler over affordable monthly payments rather than paying all in one go.

    Benefits of a New Replacement Boiler

    Cheaper bills

    While older boilers often only reach 50-70% efficiency, new A-rated models have to be at least 92% efficient by law. The less energy efficient your boiler is, the more of your fuel will be wasted and the higher your heating bills will be. Replacing a G rated boiler with an A rated boiler could save households up to £350 per annum.

    Improved comfort

    Replacing an old inefficient boiler with a newer model should improve the comfort of your home as it will heat your home more effectively. This is particularly important if there are vulnerable people in the home such as young children or elderly people.

    Better for the environment

    A new A-rated boiler which wastes less fuel will help to bring down your household’s carbon emissions and reducing your impact on the environment.

    Add value to the property

    Your home will be more energy efficient and therefore more attractive to potential purchasers when you come to sell it.

    Comparing replacement boiler prices

    The installation of a gas boiler must be carried out by a Gas Safe Registered engineer. To get the best boiler price possible we recommend you compare quotes from multiple approved heating engineers. This will enable you to make sure you’re getting the best solution for your home with the best boiler price.

    Send us an enquiry today and we’ll put you in touch with up to 3 approved heating engineers in your area. They’ll provide free no-obligation boiler replacement quotes so you can find out exactly how much your boiler replacement will cost.