Cost of New Boiler

The initial new boiler cost (supply only) can land anywhere between £500 and £2,500, but this will only include the boiler itself. There are still many deciding factors to take into account before landing on a final figure. It doesn’t have to feel like climbing Mt Everest when you’re trying to work this out!

If ‘Cost of New Boiler’ is what you’re entering into Google , then chances are you’re either dealing with:

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Having a broken boiler is never ideal, but it can still happen and must be dealt with immediately. You can start by speaking to an expert – getting professional advice is one of the best things you can do.

To do this you can either call Boilerhut on 029 2009 9898, or get a quote directly from our website. Just enter your postcode below, then hit the green button!

What’s included in Cost of New Boiler?

There are several different factors to an installation that affect the overall cost, including:

These additions are often included to ensure a high quality installation. Next thing you need to figure out, is what type of boiler is best for your property.

To learn more about boiler size and boiler types, you can also read our ‘What size combi boiler do I need’ article

Scroll down to find out!

Cost of New Combi Boiler

Cost of new combi boiler

How much is a combi boiler?

A typical purchase price for a combi boiler installation cost is going to be anywhere from £1,500 to £3,500 – but it also depends on your chosen installer. Go for one who is directly approved by their manufacturer – a strong relationship with a company who aligned themselves in this way can provide a much higher quality boiler installation and service.

Boilerhut are a Premium Viessmann Installer working nationwide to install thousands of boilers across the UK. To learn how much you could be saving with a new installation, enter your postcode in the box below then click the green button!

Please see the table below for an overview of new combi boiler costs:

ViessmannVitodens 100-W Combi26£1,017.98 (inc VAT)Gas/LPG
Worcester BoschGreenstar 25i Combi25£935.15 (inc VAT)Gas/LPG
VaillantecoTEC pro Combi24£969.98 (inc VAT)Gas/LPG
Grant VortexBlue Floor Standing Combination Boiler Oil ErP36£2,764.99 (inc VAT)Oil
ViessmannVitodens 050-W29£807.11 (inc VAT)Gas/LPG

Please note: The prices above are from an online plumbing wholesaler for the boiler only, and do not cover installation costs or other extras.

What is a combi boiler?

Combi is short for ‘combination’.

They have this name because they combine heating and DMH (Domestic Hot Water) in one compact, unit.

They’re different in this way to regular (open vent) or system boilers because they don’t require a cold water storage tank in the attic or a hot water cylinder in the airing cupboard. Essentially, it can give you hot water whenever it’s required.

REMEMBER: Every modern boiler built in the last 12-15 years, regardless of boiler type, is a condensing boiler.

Further Information on Combi Boilers:

The Viessmann Vitodens 050-W Combi Boiler is one of the most popular combi boilers currently available in the UK. For detailed review, check out the video below:


Cost of New Regular Boiler

Cost of new regular boiler

How much is a regular boiler?

The cost of a regular boiler by itself will usually sit between £500 and £3,000, so quite a big window. Just like every other boiler type however, there are more aspects to the installation to consider before landing on a final cost of new boiler.

One example is the addition of a hot water cylinder and a cold water storage tank, both of which may need to be included.

ViessmannVitodens 100-W Compact Regular26£954.96 (inc VAT)Gas/LPG
Worcester BoschGreenstar 24Ri Regular Boiler24£932.56 (inc VAT)Gas
VaillantecoTEC Plus 424 Regular24£1,030.98 (inc VAT)Gas
Grant VortexBlue 26kw Kitchen/Utility Floor Standing Regular Boiler Oil ErP36£1,793.98 (inc VAT)Oil
ViessmannVitodens 050-W29£954.96 (inc VAT)Gas/LPG

Please note: The prices above are from an online plumbing wholesaler for the boiler only, and do not cover installation costs or other extras.

What is a regular boiler?

Regular boilers are also known as ‘conventional’ or ‘open vent’ boilers. 

They include a cold water storage tank which is normally kept in the attic, and some setups include a hot water cylinder – usually kept in your airing cupboard.

Regular boilers get their water supply from the mains, which gets heated and stored in the hot water cylinder. The immediate availability of hot water in this way makes them a good choice for larger properties with more than 2 bathrooms, or if there’s a higher demand for water across multiple taps and showers.

Cost of New System Boiler

Cost of new system boiler

How much is a system boiler?

The cost of new system boiler by itself varies, but often lands somewhere between £500 and £1,500.

Similarly to the other boiler types, a system boiler installation will require additional features and services to ensure success.

By their very nature, boilers aren’t cheap. However, given the importance of staying warm (particular during the winter – we definitely don’t want another beast from the east!), the investment is more than worth it. 


ViessmannVitodens 100-W System Boiler26£1,077.98 (inc VAT)Gas/LPG
IdealIndependent 24KW System Boiler24£872.98 (inc VAT)Gas
VaillantecoTEC Plus 624 System Boiler24£1,220.98 (inc VAT)Gas
Grant VortexBlue 26kw Kitchen/Utility Floor Standing Regular Boiler Oil ErP36£1,997.98 (inc VAT)Oil

Please note: The prices above are from an online plumbing wholesaler for the boiler only, and do not cover installation costs or other extras.

What is a system boiler?

It’s easy to get system boilers and regular boilers confused, because they both require a hot water cylinder. However, a system boiler is a closed system, with no need for a cold water storage tank in the attic.

System boilers are a popular choice for many homeowners, capable of supplying hot water to multiple outlets simultaneously. They also save on space due to the absence of a cold water storage tank.

What’s included in a cost of new boiler with installation?

There are many aspects to a new boiler installation besides the boiler itself that affect its final price.

Let’s take a look at how these features can affect the overall cost of new boiler:

1. New Boiler Cost – Magnetic Filter

Are Magnetic Filters Worth It? Read our detailed guide to find out.

By having a magnetic filter installed, you can extend the lifespan of your boiler and central heating system.

The name is a bit of a giveaway, but magnetic filters help catch most of the magnetic sludge and non-metallic deposits that circulates around your heating system. This sludge often sits at the bottom of your radiators, causing damage to your radiators’ effectiveness and on occasion, the boiler’s internal components.

Benefits from having a magnetic filter installed along with your cost of new boiler include:

  • Reduced annual energy bills
  • Drastic improvement to your boiler’s efficiency
  • Reduced likelihood of frequent/expensive repairs
  • Extension of boiler’s lifespan
  • Reduction of carbon footprint

A manufacturer-approved installer will always recommend a magnetic filter for a final quote. This is because of how much they can extend your boiler’s lifespan and improve the overall quality of your central heating system.

2. New Boiler Cost – Hardwater Filter

If, like many other homeowners in the UK, you’re tired of limescale and rust building up, you’re not alone. Limescale can prevent your appliances from working properly, so getting a filter installed along with your new boiler is a no-brainer.

If there’s a build up of limescale in your system, the flow of water becomes restricted. When this occurs, the boiler’s internal heat exchanger (which helps provide heat to your water) will rise in temperature. If it gets hot enough, the water starts to steam, causing those ‘kettling’ noises to come from your boiler.

To avoid this issue, many manufacturers only use the highest quality materials. For instance, Viessmann’s patented Inox-Radial stainless steel heat exchanger uses material only one grade down from surgical steel. Click here to find out more.

If you’re unsure of the condition of the water in your property’s location, you can use the map below to help get a better idea.

Hardwater area uk map


3. New Boiler Cost – Power Flush/Chemical Flush

If you already have magnetic sludge deposits in your system, you’ll need to have an Advanced or Power flush arranged to help clear it out.

These will always need to be carried out by a visiting professional. When arranging a flush of your system, you’ll need to consider the age of your property before making a decision on which type is best.

What is a chemical flush?

A chemical flush is a procedure that breaks down and disperses the magnetic sludge that accumulates over time using powerful rapid heat cleaner chemicals. With a strong final flush and added chemical inhibitor, it gives your system a much-needed clean to improve its lifespan and overall quality.

Why do I need a chemical flush? Let’s take a look at some of the benefits:

  • The cost is lower than other options
  • Perfect for breaking down sludge in older properties with weaker systems
  • Easier to save money

What is a power flush?

Adey MagnaCleanse Powerflush Machine

A power flush is another effective way of helping get rid of the magnetic sludge and other non-metallic elements out of your system.

When the professional visits your property, they’ll bring with them the power flush machine itself. This has a pump that gets attached to your heating system, which then sends powerful chemicals through your pipework and radiators at high speed.

Although power flushes are a very effective method of clearing your system, they’re not often the best choice for weaker, older systems. We always recommend speaking to an expert to ensure everything about what’s included in the installation is clear and concise.

Watch the video below to learn more about how this process takes place:

4. New Boiler Cost – Relocating the boiler

You might find that during the planning process for your new boiler installation, there are better places to position the boiler than where you currently have it installed. Doing this requires physical labour, with the possibility of added pipework and other general fixtures. Doing so obviously adds more to the overall cost, so make sure it’s genuinely going to benefit you to move it, because if not, then it’s quite an easy decision to make.

 5. New Boiler Cost – Upgraded heating controls

Cost of new boiler with smart thermostat

Having a high-quality thermostat available is vital for allowing users full control over their central heating system.

With technology continuously developing, modern thermostats are becoming increasingly advanced in their capabilities. Examples include the Nest Learning Thermostat, capable of adapting to your living behaviours and helping you save a lot more money in the long run.

The cost of this would vary depending on the thermostat’s manufacturer. 

For a comparitive look at two of the industry’s biggest players in this arena, check out our Nest vs Hive blog post.



5. New Boiler Cost – Gas Upgrade

Cost of new boiler with gas upgrade

There are different sizes of gas pipework installed across the UK, usually depending on the age of the property itself. They will likely be either:

  • 8-10mm (microbore) – similar in width to a pencil
  • 15mm – similar to a cuban cigar

Speaking with an expert about your new boiler installation plans is the best way to find out whether you’re due a gas upgrade or not. If the installer of your current boiler failed to address this issue, then the installation would have been carried out illegally.

6. New Boiler Cost – Flue Position

Cost of new boiler with flue position

What is a boiler flue? 

It’s the large pipe that exits the top of the boiler, and allows combustion fumes produced from the boiler’s operation to escape safely away from the property while adhering to boiler flue regulations. Think of it almost like an exhaust pipe for your car.

Why would I need to pay for my boiler flue?

In most properties, it’s more common for a boiler flue to exit the building horizontally. 

This isn’t always the case, however. For some, the flue will need to be redirected to exit your property vertically (often through the roof). This is a process that incurs further costs, due to the labour required as well as any additional features such as a plume kit.

7. New Boiler Cost – Condensate Pump

On many occasions, a boiler will be installed at the centre of the property (usually in an airing cupboard). When this occurs, you won’t have the access required for an internal condensate pipe to be installed.

The solution? If you have a condensate pump installed, you’re allowing the condensate (acidic water) to be pumped up into the attic space. From here, the condensate can then be directed down a soil stack or downpipe.

Additional costs such as this must be included to ensure your new boiler installation complies with current boiler and flue regulations.

For further information, please read the following blog posts:

8. New Boiler Cost – Additional Scaffolding

Cost of new boiler with additional scaffolding

This will entirely depend on each installation, but there may be occasions where hiring scaffolding is required. If your chosen installer is professional and experienced, they will inform you of this beforehand.

Strong communication is important for knowing what’s been agreed for the installation. For any installation, always make sure you fully understand your terms and conditions.

9. New Boiler Cost – Additional unplanned work

On the occasional install, it’s not entirely unheard of that additional work is required to ensure a successful installation. This could range from scaffolding as mentioned above for accessing a wall, or even changes in space availability among many other things.

The best way to avoid any issues with extra work or any surprise additions to your overall cost, is to be completely honest and transparent with your installer.

By communicating very clearly from the beginning what you’ve agreed to, you can avoid any confusion during the planning process. Be honest with your installer, and you’ll be able to use their knowledge and experience to ensure you get a boiler that’s right for you and your property.

Cost of New Boiler – Conclusion

Now that you’ve seen what can be included in an installation, you can get a much better idea of the overall cost of new boiler. That being said, it can be difficult to understand if you’re not completely familiar with the industry. Discussing requirements with an experienced, professional installer can make a big difference.

Most boilers are expected to last up to 15 years before needing a replacement. This can depend on the experience of your installer, and whether they’re a premium, mid-range or budget brand. In the case of Boilerhut, we are a Premium Viessmann Installer, able to provide you with an installation and service that exceeds expectations and ensure that your boiler is well and truly prepared to provide comfort and warmth for up to 15 years!

If you’d like to find out more about how Boilerhut can help you with your new boiler, you can either:

  • Send an email through to with your queries
  • Call 029 2009 989 to speak to a heating expert directly
  • Enter your postcode in the box below, then click the green button

2 replies
  1. Nicola
    Nicola says:

    Can you tell me how much roughly to install Viessmann 100-W system boiler please? I have 15 radiators 4 bedrooms and 3 bathrooms.


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