Heatable uses cookies to give users the best possible experience.

View Policy


Nest Thermostat E¹

How much a new boiler costs (with installation) in 2019

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 2019.

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

Need to know the cost of a new boiler, quick? Use our online tool.

How much do new combi boilers cost? £1,500 → £3,500

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

Premium boilers = Premium prices.

Complex installations = Complex costs.

London = 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 cost somewhere in the middle.

P.S - We fit new combi boilers for £1,695, all over the UK, within 24 hours. Get a fixed quote online.


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.

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.

Here's Heatable's new combi boiler costs:

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

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

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

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

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

How much do regular/system boilers cost? £1,500 → £3,000

A new regular (or system boiler) can could cost 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 brand (and warranty length), required controls, additional pumps/valves and the general complexity of the job.

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

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.

Here's Heatable's regular/system boiler costs:

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

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

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.

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, new 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

Here's Heatable's 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

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 2019 article to gain more insight than you ever thought possible.

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 ran 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.

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).


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

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

But that’s an oversimplification.

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

#1 - Cost of the boiler: £400 → £1200

Cost of boilerProbably the most pivotal aspect to any installation – the actual boiler. 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 cost:
£400  £1200

Get a fixed, online boiler quote


#2 - Labour/installation cost: £600 → £1500

Cost of labourThe amount of money assigned by an engineer or company to carry out the work. This will vary business to business and person to person but also by property location, how long it takes to install the boiler (combi swaps are a lot quicker than back boiler conversions!) and number of engineers required.

Beware that some energy providers will charge enough commission to cover a regional office party with an open bar, attended exclusively by middle aged divorcees

Cost Icon

Labour cost (swap):
£600  £800

Cost Icon

Labour cost (conversion):
£1000  £1500

Get a fixed, online boiler quote


#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 boilers flue is too close for comfort to a window, door, neighboring 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

Get a fixed, online boiler quote


#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 pipe work – their installation 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.


#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 in to the boiler itself and causing unecessary damage and boiler leaks.

A quality boiler installer will always build the cost of installing a filter in to 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:

Get a fixed, online boiler quote


#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.

There are various types of 'flushes' available. A hot, chemical flush is 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.

Cost Icon

Chemical flush cost:
£100  £150

Cost Icon

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

Get a fixed, online boiler quote


The above list is to be used as a guide only. To get a fixed, accurate price for your new boiler 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 counter parts 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.

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 curtesy of the Energy Saving Trust

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

Our new boiler cost conclusion & some key takeaways:

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

Prices range staggeringly, from close to £1,000 - £6,000 depending on 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.


More advice

Buy your new boiler, better

Get a fixed price on a Which? Best Buy in minutes

{{mainReviews.stats.average_rating}} Average · {{mainReviews.stats.total_reviews}} Reviews

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

[¹] only available on combi boiler installations