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10 Best Boiler Brands/Manufacturers to Buy and Install in 2021

This question is one almost every new boiler shopper is going to consider at some point.

In this post, we’ll take a deep dive into the world of boiler brands, explain some of the key differences between them and why some have such a good reputation, while some others have lagged behind in the battle to be named the best boiler brand champion.

You may have never given much consideration to boiler brands but are likely to have heard of household names like Worcester Bosch, Viessmann, Vaillant and Baxi

Much like you may have done Nike, Puma & Adidas.

...but you’d be understandably apprehensive about the longevity of a Diadora boiler.

So how do you know which boiler brand to choose? 

Want a new Which? Best Buy boiler with professional installation?

Factors we considered when picking the best boiler brands

You want a boiler to be reliable, offer maximum value for money and have a long life - like milk during an apocalypse.

Ultimately, these are the areas where the best boiler brands perform perfectly. 

A decent warranty period is also a winning combination, as if something does go wrong, you want the guarantee that you will not be left in the lurch to deal with it yourself. 

Lesser boiler brands will indeed leave you in said lurch.

So, to summarise, we considered the following factors when putting together our top 10 list: 

  • Warranty period offered by the brand 
  • The overall reputation of the brand based on customer reviews 
  • TrustPilot reviews  
  • Awards and accolades e.g. Which? Best Buy Awards
  • Customer service performance 
  • The price range of their boilers  
  • Efficiency ratings 

Note: Most UK households use a combi boiler, so should you want a more in-depth analysis of these, make sure to check our best combi boiler article for the full rundown. Also, check our boiler replacement guide if you are considering replacing yours soon. 


Want an exact price on a new boiler? Use our boiler quote calculator (no personal details needed).

Top 10 best boiler brands

So, without further ado, here are the best boiler brands that made our top 10 list (in ascending order): 

  1. #1 Worcester Bosch
  2. #2 Viessmann Boilers
  3. #3 Alpha Boilers
  4. #4 Ideal Boilers
  5. #5 Valliant Boilers
  6. #6 Baxi Boilers
  7. #7 Glow Worm Boilers
  8. #8 Potterton Boilers
  9. #9 Intergas Boilers
  10. #10 Vokera Boilers


#1 Worcester Bosch Boilers (Best Boiler Manufacturer)

Worcester Bosch Boilers (Best)

Otherwise known as… the boiler brand you’ve heard of.

A renowned name in the UK home heating sector.

...and the preferred boiler of 9/10 Dads.

Which? Best Buy BoilerWorcester Bosch has a long history of being one of the best-selling and most trusted brands. Several of their combi boilers have been awarded a Which? Best Buy Award for 10 consecutive years. 

Want a new Which? Best Buy boiler with professional installation?

Worcester obtained status as the best boiler brand not just through product quality, but aftercare.

Their commitment to Worcester boiler owners after installation, is quite literally second to none and the attention paid to you as a customer can border on creepy.

To showcase this, they outcasted the word warranty - suitability replacing it with the Worcester Guarantee.

Worcester Bosch Guarantee

Overall, Worcester Bosch is a great all-rounder, offering high quality and award-winning boilers at competitive prices. 

Combine that with their excellent guarantee offer, customer service, and easily sourced parts and you have the best boiler brand in the UK. 

Read our Worcester Bosch vs Viessmann Boilers review if you need some help in choosing between these two big brands. 

You can check the latest deals on Worcester Bosch boilers here, and see how the brand compared to another market leader in our Worcester Bosch vs Vaillant Boilers post. 

Key facts on the Worcester Bosch boiler brand

  • Guarantee period
    Up-to 10 years
  • Which? Best Buys
    Yes, boat loads - for 10 years running
  • Price range (fitted)
    £1,900 > £2,600

Representative Worcester boiler installation prices from Heatable.

*Prices assuming a basic ‘like-for-like’ combi boiler installation.

Boiler Model kW Fitted Price  
Worcester Greenstar 25i 25 £1,885
Worcester Greenstar 30i 30 £1,985
Worcester CDi Compact 28kW 28

(0% APR available)

Worcester CDi Compact 32kW 32 £2,370
(0% APR available)
Worcester 8000 Style 30kW 30 £2,395
(0% APR available)
Worcester Bosch Greenstar 4000 25,30 £1,745  

Is your boiler leaking or losing pressure? Use our quick and easy tool to get your fixed price boiler replacement.  

#2 Viessmann Boilers (2nd Best Boiler Manufacturer)

Viessmann Boilers 2nd Best

Dominating the European boiler market, Viessmann has a 5-star reputation thanks to their superb German engineering and simple, crisp designs. No ridge-cut here.

Now, breaking their way into the UK market, the Viessmann brand is building a solid reputation nationwide, for both reliability and quality whether you can pronounce their name, or not.

Check the latest deals on Viessmann boilers here

We’re reliably informed it’s ‘Veezman’.

Awarded a Which? Best Buy Award on 7 of their models, Viessmann has been described as a “very smart choice” by the trusted consumer organisation. They do ramble on.

Which? Best Buy Boiler

All Viessmann boilers are technically brilliant and this is a definitive advantage the brand has over rivals. For example, they use stainless steel heat exchangers as opposed to aluminium commonly used inside most other boiler brands.

A heat exchanger is pivotal and generates hot water. Some boiler brands choose to neglect this component and construct them from lesser materials at the price of longevity. Picture a well built Roman gladiator, armed only with Scotch Eggs - it will be his downfall.

Viessmann Heat Exchanger

Stainless steel is more durable, better able to deal with sludge and withstand years of corrosion, two major culprits of boiler faults and failures. 

If you prioritise quality above all else, then a Viessmann boiler may be the right choice for you and your home.  Check out our Viessmann Vitodens 050 Review and Viessmann 100 Review for a more in-depth look into two of their most popular models. 

Key facts on the Viessmann boiler brand

  • Warranty period
    Up-to 10 years
  • Which? Best Buys
    Yes, three bags full
  • Price range (fitted)
    £1,695 > £2,300

Representative Viessmann boiler installation prices from Heatable.

*Prices assuming a basic ‘like-for-like’ combi boiler installation.

Boiler Model kW Fitted Price  
Viessmann 050-W 29 £1,695
Viessmann 050-W 35 £1,890
Viessmann 100-W 26

(0% APR available)

Viessmann 100-W 30 £2,195
(0% APR available)
Viessmann 100-W 35 £2,415
(0% APR available)
Viessmann 111-W 35 £3,425
(0% APR available)

Check our new boiler costs guide and use our boiler size calculator if you want to get a better understanding of how our fixed price boiler quote tool works. 

#3 Alpha Boilers (3rd Best Boiler Manufacturer)

Alpha Boilers (6th Best)

Would mutton ever dress as lamb?

It seems so.

Disguised as, or accused of being a ‘budget’ boiler brand, Alpha have been quietly slotting nifty little bargain boilers into UK homes for years and totally forgot to advertise that fact.

Alpha boilers are a budget-option brand that has been increasing its market share in the UK wide boiler market over the last few years. They are a fantastic option for the buyer who is looking for a reliable and affordable heating solution with a moderate warranty length. 

Although considered a budget boiler brand, on a technical level, Alpha’s products are excellent, for example, they utilise a stainless-steel heat exchanger which is usually something you would only expect in a premium brand like Viessmann. 

Alpha E-Tec BoilerAlpha’s range of combi boilers are by far the most popular and they include the likes of the E-Tec, Intec or Evoke, and they are priced between £520 and £2,500. 

Alpha offers a warranty of 7 years on their Alpha E Tec, but Heatable offers an exclusive 10 year warranty, which matches some of the premium brands. 

The ever classy parents of Alpha, - the Italians - count Alpha as their countries #1 boiler brand and fourth  favourite thing in the world behind, olive oil, smoking and Andrea Pirlo’s hair.

Alpha is a superb choice for those wanting the best central heating boiler (if on a budget). 

Having issues with your combi boiler? Read our boiler problems and solutions for quick troubleshooting guidance. 

Key facts on the Alpha boiler brand

  • Warranty period
    Up-to 10 years
  • Which? Best Buys
    None, not for lack of trying
  • Price range (fitted)
    £1,500 > £1,995

Representative Alpha boiler installation prices from Heatable.

*Prices assuming a basic ‘like-for-like’ combi boiler installation.

Boiler Model kW Fitted Price  
Alpha E-Tec Combi 28 £1,575
Alpha E-Tec Combi 33 £1,745

Looking to pay for your new boiler monthly? Refer to our boilers on finance guide for more info. 

Have you got limited space in your home? Check out our guide on the best small boilers

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. 

#4 Ideal Boilers (4th Best Boiler Manufacturer)

Ideal Boilers (3rd best)

As their name implies, the Ideal brand does indeed create some ideal boilers. Not incredible, not awful. Just… ideal.

Established in 1906 in Kingston upon Hull, Ideal boilers have a long history in the UK home boiler market as a historic British brand with a reputation for excellence. 

So far, so boring. But the Ideal brand has at least secured sponsorship of the equally boring, and arguably third best football team in the Midlands - West Brom.
Ideal Boiler Man

Ideal offers a comprehensive range of boilers from budget-friendly models to the more robust variety with all the bells and whistles and fancy features you could want. 

Note: Thinking about an immersion heater instead? Read our guide to find out how they compare to combi boilers. 

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

Key facts on the Ideal boiler brand

  • Warranty period
    Up-to 12 years (MAX accredited installers only)
  • Which? Best Buys
  • Price range (fitted)
    £1,400 > £2,900


#5 Vaillant Boilers (5th Best)

Vaillant Boilers (4th Best)

Vaillant is another boiler brand with a big presence in the UK boiler scene and another one of the few brands awarded with a Which? Best Buy. 

Which? Best Buy Boiler

And joining Abraham Lincoln and Shakira's hips on a particularly prestigious list - Which? don’t lie.

Vaillant has earned its right to sit amongst the other award-winning brands through churning out premium quality boilers longer than anybody would care to Google. 

Made in the UK, Vaillant offers a variety of boiler types and sizes, engineered to an extremely high standard and backed by a hefty 10-year warranty. Are you wondering exactly what a combi boiler is? Find out in our what is a combi boiler guide.  

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

Do you have a Vaillant and are experiencing the F28 code? Read our full guide on the Vaillant F28 error

Key facts on the Vaillant boiler brand

  • Warranty period
    Up-to 10 years
  • Which? Best Buys
  • Price range (fitted)
    £1,800 > £3,900
Downsides? The only thing to exceed Vaillant's product quality is their price.

#6 BAXI Boilers (6th Best)

BAXI Boilers (5th Best)

With their manufacturing centre based in Preston, Lancashire, BAXI is another British made boiler brand with a solid offering of combi, regular and system boilers engineered to last the test of time. 

Although not typically recognised as being a premier option in the heating industry overall, BAXI does have a nice selection of products, with healthy warranties and award-winning customer service. So, with all these factors in mind, if you are looking for a brand that offers maximum value for money, a BAXI may be the way to go. 

It’s not necessarily all quality delivering on that time test, though. Rather quantity.

BAXI have produced more boilers in the last decade than Gillette have razors, and in doing so have inadvertently spoiled their own boiler broth.
Too many cooks

Choosing one of their very good boilers requires a roulette style gamble, or extensive research.

On the plus side, BAXI’s North Pole of boilers has commanded an army of boiler elves on hand to deliver awesome aftercare.

If excellent customer service and availability of parts are important to you, BAXI offers both. 

Do you have a back boiler and want it replaced with a modern combi boiler? Ideal looking like an ideal choice? Get a fixed online price.

Interested in a Baxi? Read our Baxi Duo Tec 28 review and the Baxi 600 Combi boiler

See how the brand fared against Worcester Bosch in our Worcester Bosch vs Baxi comparison. 

Key facts on the BAXI boiler brand

  • Warranty period
    Up-to 10 years
  • Which? Best Buys
  • Price range (fitted)
    £1,300 > £2,100


Want an exact price on a new boiler? Use our boiler quote calculator (no personal details needed).

#7 Glow-Worm Boilers (7th Best)

Glow Worm Boilers (7th Best)

Glow-worm remains in its infancy as another ‘budget’ boiler brand but has the good fortune of being charitably fostered by boiler brand giants, Vaillant.

Manufactured in their Derbyshire factory, Glow Worm is another UK made boiler brand offering a variety of boilers including combi, regular and system models. Glow Worm’s Energy range incorporates the latest technology to help increase efficiency, reduce fuel wastage and ultimately reduce your carbon footprint. 

An ideal option for those looking for an energy-efficient boiler on a budget. All the while, easing up on your planet burning appliances.  


Key facts on the Glow-worm boiler brand

  • Warranty period
    Up-to 10 years
  • Which? Best Buys
  • Price range (fitted)
    £1,100 > £2,900

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

#8 Potterton Boilers (8th Best)

Potterton Boilers (8th Best)

You haven’t heard of Potterton, I haven’t heard of Potterton. This one’s going to be quick.

That dumfounded and motionless stare of looking at somebody else’s TV remote? Just pop HDMI 2 on? Good one.

That feeling? That’s Potterton.

In the past, Potterton manufactured condensing boilers for the premium end of the market only, but in recent years have launched a range of budget boilers, that has meant their warranty has been reduced to a measly 2 years, which may not offer the peace of mind many buyers are looking for. 

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

Their combi boiler range includes the Promax, Titanium, Promax Ultra, Assure and Gold, and are priced between £675 and £1,350.

Have an issue with your Potterton boiler? Read our in-depth guide on Potterton Boiler Problems.

Apart from their short warranty period (on most models), Potterton does offer some technically brilliant boilers.

Potterton's marketing team are just trying to reach you telepathically, that’s all. 

Key facts on the Potterton boiler brand

  • Warranty period
    Up-to 10 years
  • Which? Best Buys
  • Price range (fitted)
    £1,600 > £2,400


#9 Intergas Boilers (9th Best)

Intergas Boilers (9th Best)

Intergas is a relatively new boiler brand in the UK that boast that their boilers offer the fewest moving parts of any rival.

A feat that Carlo Ancelotti’s Everton team also achieved in 2020.

But as any good bank robber will tell you.. Nobody moves, nobody gets hurt. It’s similar for boilers.

As far as boilers go, the latest Intergas boilers are extremely attractive, offering sleek, contemporary designs, super modern LED displays and remote-control systems for ultimate convenience and user-friendliness. Like Ryan Gosling with a Go-Pro on.

They offer two combi ranges, Rapid and Compact, which are priced between £630 and £1,040 and a warranty ranging from 3 years up to 7 years depending on the exact model you choose. 

If you're on the hunt for a condensing boiler that looks sleek and has a quality build, then Intergas may be an option to consider. 

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

Want to know how condensing boilers differ from combi boilers? Read condensing boilers vs combi boilers

Key facts on the Intergas boiler brand

  • Warranty period
    Up-to 10 years
  • Which? Best Buys
  • Price range (fitted)
    £1,900 > £3,600


#10 Vokera Boilers (10th Best)

Vokera Boilers (10th Best)

Imagine all the boiler brands you haven’t heard of in this list? Now imagine the one’s we haven’t listed.

Vokera’s 10th spot is still noteworthy.

Engineers love their simplicity and homeowners love their price.

In terms of warranties, Vokera offers a warranty from 2 years up to 7 years depending on the exact boiler model you choose. Their models include the Evolve C, Unica i, Vision Plus, Vision C and the Compact A. Staggeringly awful names for what are indeed, decent boilers.

Overall, Vokera is a fantastic budget-friendly option, so if you are looking for a no-thrills boiler for your property, a Vokera might just be the perfect solution.   


Key facts on the Vokera boiler brand

  • Warranty period
    Up-to 10 years
  • Which? Best Buys
  • Price range (fitted)
    £1,200 > £2,100

If your radiator is cold at bottom, it may be a sign of a faulty 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. 

Our best boiler brands conclusion:

Before taking the plunge and sinking pure pound notes into any new boiler brand, make sure you're getting a good blend of the below...

  • A long warranty (10 years is almost an industry standard nowadays)
  • A Which? Best Buy (or another industry award winner)
  • High TrustPilot ratings or reviews for customer service

At Heatable, we only fit boilers that offer that beautiful blend.

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

To get a fixed quote on the best boiler brands, buy from Heatable. Easy.


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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

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