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New Boiler Costs in 2021 - Boiler Installation Costs & Prices

The cost of a new boiler installation has been shrouded in mystery for centuries. We've raided the tombs of boiler knowledge and unpacked the baggage of new boiler installation prices. From combi swaps to complex conversions, this is EVERYTHING you'll need to know. Ever.

A guide to new boiler costs in 2021.

New Boiler Cost Question

Finding the true cost of a new boiler is incredibly confusing and anger inducing, like struggling to remove a spider web from your face.

Why do boiler installations range from worryingly cheap three figure deals to mortgage worthy sums from the big energy companies?

Important point: You do not have to buy your boiler from the company that provides your gas or energy bills.

Please note: Ultimately an accurate boiler installation cost depends on a variety of factors personal to your situation.

How much does a new boiler cost? Overview:

How much is a new boiler fitted? 

The cost of a boiler replacement depends on a variety of factors, these include:

However, a straight-forward combi swap is the most popular and typically the least expensive. 

Book before 3 pm and you could get your new boiler installed as quick as tomorrow. Check the latest boiler prices here

How much is a standalone boiler? 

A new boiler costs £600 - £2,500, depending on the model and type of system. A new combi boiler costs £500 - £900 for a budget model, £900 - £1,200 for a mid-range model and £1,000 - £2,000 for a premium model depending on the size of the boiler.

A new system boiler costs £600 - £900 for a budget model, £900 - £1,300 for a mid-range model and £1,300 - 2,500 for a premium model. 

A regular or heat-only boiler costs £500 - £2,500 depending on the size and quality. You might expect to pay between £7,000 - £15,000 for a biomass boiler. 

These are the prices for the standalone boiler only and do not include Gas Safe Installation or any other extras.  

Let's explore some common boiler installation cost scenarios....

Boiler Installation Cost Scenarios:

Let's start with the UK's most common type of boiler replacement - the gas combi boiler: 

Combi boiler costs? £1,500 → £3,500

A new combi boiler costs anywhere from £1,500, all the way up to £3,500, including installation, depending on the type of boiler you'd like, its warranty length, how complex the required installation is, and what the labour costs are in the area which you live.

Check current prices using our calculator

Premium boiler replacement cost = Premium prices.

Complex boiler installation = Complex new boiler installation costs.

London boiler costs = Bloody expensive.

If it's a straight forward job, you should be looking towards the lower end of the scale. If your job is crazy complicated, expect the worst. Most end up with a new boiler cost somewhere in the middle.

Learn all about combi boilers in our what is a combi boiler guide. 

P.S - We fit new combi boilers for £1,595, all over the UK, within 24 hours. Get a fixed quote online.


Want an instant quote for new boiler installation costs? Use our boiler quote calculator (no personal details needed).

What is a combi boiler, anyway?

A combi boiler is simply a ‘combination boiler’ - it controls both your heating and hot water, delivering them both instantly on-demand, and doesn’t require a hot water cylinder to be heated prior. They are far more efficient than immersion heaters, so if you have one, it's definitely worth considering an upgrade. 

Combi boilers are the home heating dream that the human race has been striving towards since the discovery of fire.

Imagine if Usain Bolt was your postman, but he also did your bins. A combi boiler is like that... basically.


Combi boiler costs - boiler replacement cost guide: 

These fixed prices assume a straight forward swap, and the new boiler costs include a chemical cleanse, wireless controls, boiler filter, full Gas Safe installation, and more.

Curious to know which boiler brand performed worst? Find out in our report of the worst boilers

How much will your boiler replacement cost? Use our boiler quote calculator.

Boiler Model Cost   
Viessmann 050-W 29kW £1,695
Viessmann 050-W 35kW £2,075
Viessmann 100-W 26kW £2,147
Viessmann 100-W 30kW £2,304
Ideal Logic 24kW £1,650
Ideal Logic 30kW £1,845
Ideal Logic 35kW £2,245

Want the latest new combi boiler deals? If you want to get a boiler replacement cost quickly, click "get quotes" in the table above. 

You could sleep well for years to come having acquired any of the above central heating boilers, but it is without a doubt that the Viessmann comes out on top in almost every comparable dimension.

How much will your boiler replacement cost? Use our boiler quote calculator (no personal details needed).

In particular, the Viessmann Vitodens 050-W - a boiler with a price point an seasoned circus clown couldn’t match and features to make a Worcester Bosch blush.

Combi boiler not working? Get a fixed quote with our online tool.

Regular and System boiler replacement cost? £1,500 → £3,000

A new regular (or system boiler) boiler replacement cost can range anywhere from £1,500, all the way up to £3,000. Again, the final cost can be affected by a number of factors including but not limited to; the boiler manufacturer (and warranty length), required controls, additional pumps/valves and the general complexity of the job.

Want a new system or regular boiler with professional installation as quick as tomorrow? Get your free quote today

Unlike combi boilers, regular/system boilers require a hot water cylinder in order to function. The new boiler costs above are for the installation of the boiler only and do not include any costs for new/replacement cylinders.

Interested in paying for your boiler monthly? Check our boilers on finance guide, for the full run down. 

What actually is a regular or system boiler?

For reasons of ease and boredom evasion, we’ll combine ‘regular’ and ‘system’ boilers into the one breakdown.

Hot Water Cylinder

From a purchasing point of view, all you’ll need to know is that they aren’t combi boilers, they’ll have a separate water cylinder (usually in an airing cupboard) and/or water tank (often in your loft) and they don’t provide instant hot water on demand.

If you live in a large home (high hot water demand), with multiple bathrooms, then a system/regular boiler is perfect for you. Check the latest system boiler prices here

Related reading: 

Regular/system boiler replacement cost summary:

These fixed boiler replacement costs assume a straight forward swap, and the costs include a chemical cleanse, boiler filter, full Gas Safe installation, and more.

Need to know the cost of a new boiler, quick? Find out what replacement you need along with costs

Boiler Model Cost   
Vitodens 100-W 13kW £1,995
Vitodens 100-W 19kW £2,295
Vitodens 100-W 26kW £2,540
Vitodens 100-W 35kW £2,879
Ideal Logic 15kW £1,895
Ideal Logic 19kW £2,095
Ideal Logic 24kW £2,360
Ideal Logic 30kW £2,879

Click "get quotes" in the table above if you want a fixed priced based on the latest new combi boiler deals. 

How much does it cost to convert from a regular boiler to a combi boiler? £2,500 → £4,500

Boiler Conversion CostUpgrading a traditional boiler to a combi boiler is a bucket list regular for most UK homeowners, sitting seven places above seeing the Pyramids and just one below breaking free from lifelong, crippling debt.

Conversions can be complex beasts, and they come with costs you'd associate with a complex beast.

Please note: Ultimately an accurate boiler installation cost depends on a variety of factors personal to your situation.

But exactly how much extra will you be paying?

Included in the cost of a boiler conversion, is the full removal of your old boiler & water cylinder, newly upgraded pipework fed to the existing or new location of the incoming combi boiler and of course, the new combi boiler itself. 

...and that’s a simplified version.

It can be a big job, requiring two days of work and engineers so, in tune with their tools, they can make a crowbar dance.

Putting you out of your misery early, you’ll roughly be looking at at additional £800 - £1200 worth of expense on top the standard boiler swap cost

New boiler conversion costs:

These fixed prices assume a straight forward conversion, and the costs include all of the above, plus upgraded heating controls, a full chemical cleanse of your existing boiler system, boiler filter and registration.

Do note that other, much more expensive quotes are available elsewhere. Try your energy provider if you fancy a laugh.

Boiler Model Cost   
Ideal Logic 24kW £2,790
Ideal Logic 30kW £2,990
Viessmann Vitodens 050-W 29kW £3,039
Viessmann Vitodens 100-W 26kW £3,370

Have you had a new boiler quote yet? Use our calculator to get an instant new boiler quote.

When converting your regular boiler into a combi boiler, do remember that any boiler manufacturer can be fitted so long as it’s the correct size and powerful enough for your hot water demands and consider referring to our Best Combi Boiler article to gain more insight than you ever thought possible.

Want to know which boiler power is right for your home? Check out our "what size boiler do I need" guide.

How much does a back boiler to combi conversion cost? £3,000 → £5,000

You can scan over a more comprehensive back boiler description in this article if you’ve run out of paint to watch dry

…But a broken back-boiler is an old dog that needs to be put down.

They can no longer be repaired in accordance with modern regulations and you will need to convert your system - most likely to a modern combi boiler.

Back Boiler Conversion Cost

Heatable apply a transparent, and fixed cost of £395.00 on top of our standard conversion costs. This can get much steeper when buying from other national companies so make sure you don’t settle for your first quote.

The work involved in the conversion of a back-boiler is very much similar to a standard conversion in that it includes the removal of your entire existing system and introduction of the new combi and required pipework, however, it’s the awkward location of the back boiler behind your fireplace that incurs the sometimes significant extra cost.

Many installers and installation companies hate carrying out this work and will therefore simply price themselves so high they can just about bare it or high enough to discourage customers.

Want to have your boiler moved to a different location? Check out our "cost of moving boiler" guide.

If your radiator is cold at bottom, it may be a sign of faulty heat exchangerfaulty boiler valve, in which case getting your new boiler replaced may be appropriate, check out the Worcester Bosch Greenstar 30i, which you can purchase through us. 

Want an exact price on a new boiler? Use our boiler quote calculator.

Case study: Cost to convert a Baxi Bermuda back boiler to a combi boiler

Converting from a Baxi Bermuda - or any brand of back-boiler - can appear costly upfront but the rewards are there to be reaped for years to come.

Replacing your old back boiler will:

  • Significantly reduce your energy costs
  • Slash your carbon footprint
  • Provide you with instant hot water on demand
  • Save your marriage
  • Improve the safety of your home
  • Increase the resale value of your property

Is your home doomed with a back boiler which you can't afford to convert? Sell it (your whole house that is).

If you live in an average-sized home, see our guide on choosing the best boiler for a 3 bedroom house

What is the cost of a new boiler replacement?


Want an exact price on a new boiler? Use our boiler quote calculator (your fixed price will appear on screen).

Top 10 factors which can affect the cost of new boiler replacement  

The raw bones of pricing structure may well be the cost of boiler + labour cost.

But that’s an oversimplification.

Here are the top 10 factors to take into account when calculating your new boiler costs (...there's a lot!):

#1 - How much does a new boiler cost? £400 → £1200

Cost of boilerProbably the most pivotal aspect of any installation – the actual boiler. Boiler replacement costs for quality boilers will be in the high hundreds/early thousands and vary depending on their quality, model, kW size, and brand.

Cost IconTypical boiler replacement cost:
£400  £1200

Get a fixed, online boiler quote


#2 - Boiler installation labour cost: £600 → £1500

Cost of labourThe cost of a boiler installation will depend on the amount of labour required. This can vary based on your location and the business you use, how long it takes to install the boiler and the number of engineers required.

On average the cost to install a new boiler will be between £500 and £1,000, which depends on the exact type of installation.

For example, a combi swap, taking around a day to complete is much quicker than a back boiler conversion, which takes around 2 days and may require more than one engineer to attend.

The cost of boiler installation is typically included in the fixed price quote, so if you choose to purchase your boiler via Heatable you don’t have to worry about juggling different costs and calculate a final figure. 

Cost Icon

Labour cost (swap):
£600  £800

Cost Icon

Labour cost (conversion):
£1000  £1500

Want an exact quote on new boiler replacement cost? Use our boiler quote calculator.


#3 - Vertical flue cost: £300 → £600

Vertical flue costA boiler flue, simply put is the large pipe that leads from the boiler to outside of your home – ensuring condensation and flue gases are pumped outside and not into your own face – vital.

Most of the time, the flue will leave your property horizontally incurring no extra costs but flues that leave vertically through your roof require much more work and therefore incur more costs. It can be just plain bad luck.

Cost Icon

Typical vertical flue cost:
£300  £600

Get a fixed, online boiler quote


#4 - Plume kit cost: £90 → £130

Plume kit costA plume kit is essentially an extension kit that attaches to your boiler’s flue. The plume kit is required in instances where your boiler's flue is too close for comfort to a window, door, neighbouring property, or your wife and is required by law in order to comply with Gas Safe regulations.

Failure to include a plume kit could lead to London standard air purity levels. Unless you already live in London, in which case, boiler fumes may seem a welcome breath of fresh air.

Cost Icon

Typical plume kit cost:
£90  £130

Want an exact price on a new boiler? Use our boiler quote calculator.

#5 - Main gas pipe upgrade cost: £250 → £400

Gas upgrade costMany older heating systems are built using gas piping of a certain width (often 15mm). To meet modern regulations, they need to be upgraded to 22mm in most cases which can sometimes incur additional costs.

In some instances, older pipes will also be made from lead, cheddar or the bones of early settlers and these will need to be replaced with copper piping.

Heatable never charge for upgraded pipework, whereas most installation companies will add this to your bill with unnerving pleasure and an evil laugh

Be wary of rogue traders that don’t plan for upgraded pipework – their boiler replacement costs and installation fees will be more illegal than the contents of a duffel bag in the back of their uninsured white van.

Cost Icon

Typical gas upgrade cost:
£250  £400

Cost Icon

Our gas upgrade cost:

Get a fixed, online boiler quote


#6 - Cost to relocate boiler

Boiler relocation costMoving the location of your boiler is costly and will require a lot of physical labour, additional pipework, emotional robustness as well as various general new fixtures and fittings.

Unless moving your boiler is integral to every hope and dream you have held since you were a child, do try to avoid it.

Want to save money and energy on your heating bills? If so, you should consider installing one of the best smart thermostats.  

#7 - Upgraded heating control costs: £100 → £300

Heating controls costThe days of having a pain staking, back breaking walk to your boiler to switch it on are almost behind us as a species and most new boiler installations will include some form of upgraded controller.

Depending on the type and brand of the controller, it will add varying figures to your new boiler cost.

Cost Icon

Heating controls cost:
£100  £300

Cost Icon

Our heating controls cost:
£0 - that's free!

Get a fixed, online boiler quote


#8 - Upgraded warranty costs

Boiler Warranty costExtended warranties, particularly 10-year warranties in most cases are only able to be offered by trusted partners of manufacturers.

They can sometimes rely upon the fitting of additional approved equipment like magnetic boiler filters and will often incur additional costs to that installer, but a longer warranty is certainly a cost worth incurring.

Think you've found a bargain? Check the warranty length has a longer expiry date than the last lot of milk you bought


#9 - Magnetic boiler filter cost: £100 → £200

Boiler filter costFilters are installed inline on the pipework and help to protect your boiler. They use powerful magnets which trap small particles of dirt and metal, stopping them from going into the boiler itself and causing unnecessary damage and boiler leaks.

A quality boiler installer will always build the cost of installing a filter into your quote. We include them, but we don't charge a penny more and fit them as standard throughout the UK.

Cost Icon

Magnetic boiler filter cost:
£100  £200

Cost Icon

Our magnetic filter cost:

Use this clickable form to get a fixed price on the screen instantly. 


#10 - Chemical flush: £100 → £150

Chemical flush costFlushes help to clear out existing sludge from your heating system. If you don't clear it, sludge will stop the hot heating water from flowing around your radiators efficiently. Not good. You'll be needing a deep clean if your radiators are cold at the bottom.

There are various types of 'flushes' available. A hot, chemical flush is the most common and pretty standard. But, you can pay upwards of £500 for a 'Powerflush'. Be careful with those, though. If you start forcing high pressure water through an old heating system, they can often do more damage than good.

Did you know our boiler installation cost calculator only takes 60 seconds to complete? Using a series of multiple-choice questions, it can provide you with a fixed price on a range of budget-friendly boilers. 

Cost Icon

Chemical flush cost:
£100  £150

Cost Icon

Heatable's flush cost:
£0 - Free again.

Get a fixed, online boiler quote

#11 - Radiator Costs: £100 → £150

When installing a new boiler, it's often a good idea to look at your heating system overall, which includes your radiators. After years of use, it's normal for radiators to experience wear and tear, or if they are simply old models they may be inefficient and have a poor performance in comparison to the latest offerings.  

The exact price of new radiators depends on a variety of factors including size, material, design and how many you require. 

Cost of a new boiler replacement

As you can see there are a variety of factors that can impact the final boiler installation cost. 

The above list is to be used as a guide only. To get a fixed, accurate price for your boiler replacement installation, go here.

Suffering the costs of a new boiler? Here's how much you'll save in the long-run.

Old boilers are inefficient and for every £10 you’re spending on running them, you could be throwing up to £4 of that out of the window.

This creates a huge mound of pound coins on your patio that poses a risk to the local eco system.

New boilersparticularly combi boilers – are incredibly efficient compared to their older counterparts and come packed with intuitive technology to work smarter for your homes heating needs.

This greatly reduces the amount of fuel used, whether that be Gas, Oil or LPG.

Want to know your new boiler installation costs? Use our boiler quote calculator.

Old boiler rating Semi-detached house Detached house  Detached bungalow Mid-terraced house Mid floor flat  
G (<70% efficient) £205 £315 £160 £180 £100
F (70-74% efficient) £145 £220 £110 £125 £70
E (74-78% efficient) £120 £190 £95 £105 £60
D (78-82% efficient) £110 £170 £85 £95 £55

Feast your eyes on the above typical savings courtesy of the Energy Saving Trust

They’re the most trustworthy name in the UK energy savings data collection game – an industry notorious for its untrustworthy, shark-filled business waters.

Boiler Replacement Costs Frequently Asked Questions (FAQs)

Why is British Gas Boiler Installation so Expensive? 

We often get people surprised at the price differences between ourselves and the likes of British Gas. 

The British Gas boiler installation service is usually quite expensive, typically costing several hundred pounds more than competitors. 

The major reason for this is that we don't have huge overheads to pay for, including call centres, marketing, and a nationwide network of engineers. 

But if you read the reviews left by customers, it's clear that our service is superior.  

For comparison, refer to our Trustpilot reviews, with over 1,000 reviews and averaging 4.9 stars, we take great pride in offering a hassle-free boiler service. 

Are labour costs included in the new boiler installation costs? 

Our boiler installation costs include the price of the boiler itself as well as the gas engineer's labour costs.

Unlike your average boiler installation company, our fixed price guarantee means the price you are quoted won't change. 

We know how frustrating it can be for an engineer to turn up at your home and start adding additional costs to the originally quoted price. That is why we made a service that completely avoids this common complaint. 

If you need additional labour, this will be reflected in the fixed price. For example, a straight boiler replacement will take less labour and time than a complete boiler conversion, so will cost less. 

How long should a new boiler last? 

On average, modern condensing boilers are designed to last around 10 years, but of course, this is impacted by how well it's taken care of. 

Boilers should be serviced annually by a registered Gas Safe engineer. This will ensure the boiler is well maintained, in good working order, and safe to use. 

Your warranty will also usually be void without an annual service record. A warranty will ensure that the boiler manufacturer takes care of any issues that arise during the warranty period, so it's certainly worth it. 

Want to learn about the future of heating in the UK? Check out the latest innovation of hydrogen boilers.  

Boiler installation cost conclusion & some key takeaways:

New boiler costs are a financial minefield that you could research until the end of your days.

Use this clickable form to get a fixed price on the screen instantly. 

Your boiler replacement cost can range from close to £1,000 - £6,000 depending on the work required and your chosen installation company.

Always ensure you receive the below, no matter what you’re going to be paying:

  • A fixed price with no surprise extras after work begins
  • A full parts & labour warranty that you’re comfortable with
  • A magnetic boiler filter
  • A system flush
  • Check company reviews before committing to payment

Stick to these key principles, avoid any company sending a salesman disguised as a ‘surveyor’ to your home, and put in just a touch of boiler research – do that here, conveniently 😉

You’re now just about as qualified as can be reasonably expected in order to get the most competitive new boiler cost available and avoid cowboys eying you up like an early noughties PPI victim.

Or, for simplicity…

Buy from Heatable for the latest new combi boiler deals. 


More advice

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Heatable is registered in England and Wales No. 08804726 (VAT No. GB205805920 ). Trading address is 1 Station Road, Great Sankey, Warrington, Cheshire, WA5 1RH. Heatable acts as a credit broker (not as a lender) and offers credit products through a panel of lenders. Heatable is authorised and regulated by the Financial Conduct Authority (reference no. 805259).

[1] Price based on a like for like combi swap in a 2 bed, 1 bathroom terraced home with a standard flue

[*] Installation dates are subject to installer availability

[ยน] only available on combi boiler installations

Financial Support: If you are in receipt of certain benefits, you may be entitled to claim a free boiler grant.