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Last updated: 24 May 2024

Combi Boiler Cost in the UK: Prices, Installation and More (2024)

Combi boiler costs UK

If you are looking to upgrade your heating system with a combi boiler, naturally one of the first things you will want to look into is the combi boiler cost. 

In this article, we give you an overview of the estimated new boiler cost for combi boilers, giving you an indication of the prices in the UK in 2024. We also discuss the following points: 

  • How much different combi boiler models cost
  • What affects the cost of installing or replacing a combi boiler
  • How to choose the right boiler for your home
  • How to find the best deal for a new combi boiler
  • Answers to your frequently asked questions.

Additionally, we help you take the first steps towards having a new combi boiler fitted in your home. Here, you can request boiler quotes for combi boilers and installation costs from local engineers who can work on your heating system. By comparing multiple quotes, you can find the best deal for a new combi boiler for your home and avoid being overcharged. 

Ready for a new combi boiler? Simply click below to fill in our 30-second form and request quotes from installers near you.

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How much is a combi boiler in the UK? Costs in 2024

On average, combi boilers cost somewhere between £500 and £3,000, excluding installation costs. However, the total price depends on several different factors. One of the most significant aspects that impact the cost of a new combi boiler is the size of your home and, especially, how many bedrooms and bathrooms you have. For example, the best combi boiler for a 3 bed house will range from £1,100 to £2,000 with installation included.

Smaller homes can make do with less powerful boilers often at the lower end of the price range. If your home has up to two bathrooms, a small combi boiler might be of interest to you. Larger homes need more powerful (but also more expensive) boilers to ensure that everyone gets enough hot water. If you’re unsure which is best you should compare combi boiler vs system boiler to find the best size for your home.

The table below shows the estimated combi boiler prices per house type.

House TypeNumber of BedroomsNumber of bathroomsEstimated Cost (Including Installation)
Flat1-31£1,595-£2,500
Bungalow2-4 1£1,595-£2,500
Terraced House2-4 1£1,595-£3,225
Semi-detached House1£1,595-£2,500
Semi-detached House4-5 2£1,595-£3,225
Detached House1£1,595-£2,500
Detached House4-52£1,595-£3,225

As far as the installation process is concerned, combi boilers can be fitted within 1 day. It can take longer (around 2-3 days) if new or additional pipes are required or if the placement of the boiler needs to change within your home.

This makes combi boilers some of the most affordable and easily installed types of heating systems that you could go for. Additionally, the most efficient combi boiler often boasts a 94% efficiency.

When it comes to heat pumps vs combi boilers, for example, heat pumps do cost significantly more to buy, without financial help in the form of a grant, and the scale of the installation is far greater in most cases.

Read more about: who qualifies for a boiler grant?

Combi boiler prices for the most popular brands in the UK

Boiler brands

While the size of your home can affect the cost of a new or replacement combi boiler, the price can also vary depending on the manufacturer and model you choose.

To help you get a clearer idea of the different brands available in the UK today, we provide an overview of some of the most popular brands and boiler models below. The technical specifications and prices we reference are for gas combi boilers and exclude installation costs

Worcester Bosch combi boiler prices

Worcester Bosch is a brand that is highly regarded by both homeowners and installers. They are known for their reliable products and offer some of the longest standard warranties for boilers. Below is a rundown of some of the Worcester combi boiler prices in the UK this year. 

Worcester Bosch Boiler Costs
Boiler ModelPower OutputSize of the HomeEstimated Cost
Greenstar i Junior 24 kWSmall (1-2 bedrooms and 1 bathroom)£800-£900
Greenstar Highflow CDi 29 kWMedium (3-4 bedrooms and 2-3 bathrooms)£2,130-£2,475
Greenstar CDi Classic 30-35 kWLarge (5 or more bedrooms and 4 bathrooms)£1,700-£2,400

Learn about combi boiler flow rate in our helpful guide.

Vaillant combi boiler prices

Vaillant offers boilers high quality boilers and great customer service should any issues with your appliance arise. In the table below you will find Vaillant boiler prices for some of their most popular models on the market.

Vaillant Boiler Costs
Boiler ModelPower OutputSize of the HomeEstimated Cost
EcoFIT Pure25kWSmall (1-2 bedrooms and 1 bathroom)£840-£1,160
EcoFIT Sustain25kWSmall (1-2 bedrooms and 1 bathroom)£1,250-£1,500
EcoTEC Plus29kWMedium (3-4 bedrooms and 2-3 bathrooms)£1,100-£1,500

Baxi combi boiler prices

When it comes to Baxi boilers, they are some of the most efficient and affordable appliances available in the UK. You can learn more about Baxi boiler prices in the following table: 

Baxi Boiler Costs
Boiler ModelPower OutputSize of the HomeEstimated Cost
Baxi 80025-35 kWSmall-Medium (1-4 bedrooms and 1-3 bathrooms)£980-£1,200
Baxi Platinum24-28 kWSmall (1-2 bedrooms and 1 bathroom)£930-£1,020
Baxi Duo-tec24-40 kWSmall-Large (1-5 bedrooms and 1-4 bathrooms)£815-£1,000

Ideal combi boiler prices

Ideal provides homeowners with high-efficiency and cost-effective products. They also offer quality customer care and are known to quickly solve any issues your boiler might have. We have compiled a list of Ideal boiler prices for some of their most popular models below:

Ideal Boiler Costs
Boiler ModelPower OutputSize of the HomeEstimated Cost
Ideal Independent Plus24-35 kWSmall-Medium (1-4 bedrooms and 1-3 bathrooms)£1,050-£1,265
Ideal Logic24-35 kWSmall-Medium (1-4 bedrooms and 1-3 bathrooms)£845-£1,400
Ideal Vogue Max26-40 kWSmall-Large (1-5 bedrooms and 1-4 bathrooms)£1,210-£1,400

Now that you have a better idea of the price range of different boiler brands, the next step is to find the exact cost of having a new combi boiler fitted in your home. To determine the price that applies to your situation, you will need to contact a specialist.

Fortunately, we have made it easy for you to get in touch with reputable installers. Rather than wasting hours researching installation companies, all you have to do is fill in our form in 30 seconds to request quotes from local heating engineers. You can then compare the prices you receive to find the best deal for a combi boiler installation for your home. 

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Combi boiler prices fitted: Installation cost in the UK

The cost of the boiler itself is not the only expense you need to account for when planning to install a new combi boiler in your home. Yet another aspect you must consider is the installation costs involved. 

The installation costs for a combi boiler can range anywhere between £700 to £2,000. It is important to note that these numbers are estimates and that only the installer you choose to work with can offer you the exact cost for their installation services. 

Depending on the price range of the boiler brand you choose, the following average installation costs can apply to you:

Combi Boiler Prices Fitted
Type of boilerPrice (excluding installation)Installation costsPrice (fitted)
Economy combi£500 – £1,500£700 – £2,000£1,200 – £3,000
Mid-range combi£1,500 – £2,500£700 – £2,000£2,200 – £4,500
Top-end combi£2,500 – £3,000£700 – £2,000£3,200 – £5,000

What influences the cost of a combi boiler installation

In addition to the price of the boiler itself, you will need to factor in installation costs into the total expenses of having a new combi boiler fitted in your home. 

Therefore, the final cost of your boiler installation depends on several factors, such as the boiler manufacturer, whether you’re moving your boiler, if the pipework needs to be upgraded at the installation site, which accessories you choose, whether you need to replace your radiators, or work with a local or national installer

Factors combi boiler costs

1. The boiler manufacturer

As you can see in the tables above, different boiler brands have different prices. So, the manufacturer you choose will impact the total cost of your new combi boiler.

2. Whether you want to move your boiler

If you want to have your new boiler fitted in another location within your home than your previous boiler, you will require additional pipework. This will increase the final cost of your combi boiler installation. 

3. If you need to upgrade your pipework

If the pipes at the installation site need to be replaced to ensure that your new combi boiler can function properly, you will be spending more on your boiler installation. It’s also worth noting that, if your home is built after 2025, it may not have a gas main for a boiler. They are potentially being phased out for newer properties as part of a gas boiler ban under the Future Homes Standard.

4. Your choice of accessories

Upgrading your home heating system with smart controls and thermostats is an optional decision. Just keep in mind that these accessories will also impact the total cost of your new combi boiler.

5. If you plan to upgrade or replace your radiators

Depending on the number of radiators you have, choosing to upgrade or replace them will add to the total cost of your heating system. If you want to add new radiators in a room, the pipework involved will also impact the price of your project.

6. Whether you work with a local or national installer

Working with national installers will cost you more than the services of local heating engineers. This is because local installers won’t have running costs (like helpline fees) to uphold.

Costs of replacing an old boiler with a new combi boiler

The total cost of your boiler upgrade will depend on the kind of replacement you are looking for. You can opt to replace your old combi boiler with a new one, changing from a conventional boiler to a combi, or remove your system boiler to install a combi boiler.

Replacing a combi boiler with a new combi boiler

Combi boiler replacement

This swap can be made fairly easily, as the pipework required should already be in place at the installation site. Unless you decide to move your boiler to a new location within your home, you will not have to worry about high additional expenses. On average, your new combi boiler installation will cost somewhere between £1,700 and £3,500.

Replacing a conventional boiler with a combi boiler

Conventional to combi boiler replacement

This kind of replacement is a great option if you want to improve the efficiency of your heating system. Because replacing a conventional boiler requires additional labour when it comes to pipework and removing the many parts of your old boiler, the total cost of your boiler upgrade can be around £2,500-£4,500. This is similar to back boiler replacements, which include the same components as conventional boilers.

Replacing a system boiler with a combi boiler

System boiler to combi boiler replacement

If you want to improve the hot water supply in your home, you might be looking to replace your system boiler with a combi boiler. This swap will also save you space in your home, as you will no longer require a hot water cylinder. The cost of replacing a system boiler ranges somewhere between £1,500 and £3,000

It is important to note that the numbers we mention here are only estimates. What can help you get an even clearer idea of how much a boiler replacement would cost is comparing multiple quotes for combi boiler installation services. 

By requesting quotes from heating engineers, you get more accurate prices and you can compare installation costs to find the best deal for your home. 

Find the best combi boiler prices in the UK and get free quotes

Once you have decided which brand of combi boiler you want to have fitted in your home, you will want to find the best combi boiler deal for your new installation. As we have explained, there are a few factors that affect the total cost of a combi boiler, so you will want to consider each of them, including which is the best gas boiler, to find the combi boiler that best fits your financial situation. 

Additionally, finding the best deal requires some research into installation companies. We know that this process can seem daunting. It can take hours of reading through reviews to find the right installer. 

To make things easier, we have done the research for you and found a network of reputable heating engineers you can trust. All you have to do now is fill in our form in 30 seconds and request quotes. You can then compare information from several installers to find the best deal for your new combi boiler. 

Click below to get started today!

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Frequently asked questions

Sabria Schouten
Written by Sabria Schouten, Writer

Sabria is a writer committed to making even the most complex information about sustainability and energy efficiency easily accessible to homeowners looking to make greener choices. With a background in literary studies, she has a wealth of experience when it comes to academic research and writing.

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