Best Boilers UK – a 2024 Buyer’s Guide

Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: February 29, 2024. Updated: May 17, 2024

This guide will help you discover the best boiler for you. It should be dependable and energy-efficient, quiet and last a long time. We’ll compare the top boiler brands and models and we’ll also include the new boiler cost too.

Key Takeaways

  • The best boiler available right now is the Viessmann Vitodens 100-W. It’s a premium gas boiler with quality components for a good price.
  • The top boiler brands in the UK in 2024, known for their quality, efficiency, and innovation, include Viessmann, Vaillant, Worcester Bosch, Alpha, and Baxi.
  • Boiler types such as combi, system, and conventional/heat-only each offer different benefits which cater to the specific needs of varying households.
  • When choosing a boiler, consider key factors such as efficiency ratings, warranty length, fuel availability, component materials and features like smart controls and design.
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1. VIESSMANN VITODENS 100-W (BEST BOILER IN THE UK)

Viessmann Vitodens 100-W 26kW Combi Boiler - Best Boiler in the UKThe Vitodens 100-W is available as a combi boiler, system boiler, and regular/heat-only boiler across various power outputs that suit most small to medium homes with 1-4 bedrooms.

It’s expensive, but it’s the best boiler because of its high-quality components, long warranty, and integrated WiFi, which allows Viessmann (and Boilerhut if we installed it) to monitor your boiler for faults and issues for years to come.

It is our pick for the best boiler, and it features:

  • Up to 12-year manufacturer warranty
  • A modulation range of 1:10 due to the MatriX-Plus burner
  • Energy rating – A-rated, 94% efficient
  • Patented Inox-radial stainless steel heat exchanger
  • Integrated WiFi for remote monitoring and diagnosis

Read our 100-W 30kW combi boiler review for more information.

MODEL KW PRICE
Vitodens 100-W 26kW Combi 26 £1,430 (Boiler). From £2,760 Installed. Get Quote >
Vitodens 100-W 11kW System 11 £1,330 (Boiler). From £2,860 Installed. Get Quote >
Vitodens 100-W 19kW Heat-Only 19 £1,247 (Boiler). From £2,790 Installed. Get Quote >
Vitodens 111-W 32kW Storage Combi 32 £1,980 (Boiler). From £3,340 Installed. Get Quote >

2. VAILLANT ECOTEC PLUS

Vaillant ecoTEC Plus - Best Boilers UKThe Vaillant ecoTEC plus is available as a natural gas and LPG combi, system and regular boiler. These boilers have stainless steel heat exchangers, are well-reviewed, are highly efficient, and have a 10-year warranty. The ecoTEC plus features:

  • Simple controls
  • Up to 94% efficiency
  • Modulation of 1:10

Read our ecoTEC plus review.

MODEL KW PRICE
Vaillant ecoTEC plus 630 System 30 £1,790 (Boiler). From £3,140 Installed. Get Quote >
Vaillant ecoTEC plus 835 Combi 35 £1,690 (Boiler). From £3,090 Installed. Get Quote >
Vaillant ecoTEC plus 418 Regular 18 £1,288 (Boiler). From £2,910 Installed. Get Quote >
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3. VIESSMANN VITODENS 050-W

Viessmann Vitodens 050-W Combi Boiler B0KA - Best boilers in the UKThis is Viessmann’s entry-level boiler. But, the 050-W is still one of the world’s best boilers. The warranty is two years shorter than the 100-W at 10 years, but it has the same heat exchanger and built-in WiFi for fault monitoring.

  • 10-year comprehensive manufacturer warranty
  • Durable, patented stainless steel heat exchanger manufactured in-house
  • A-rated, 92% efficient boiler
  • 1:8 modulation range to help save you money using OpenTherm communication with thermostats.

Read our Vitodens 050-W 19kW system review.

MODEL KW PRICE
Vitodens 050-W 25kW Combi 25 £1,060 (Boiler). From £2,460 Installed. Get Quote >
Vitodens 050-W 19kW System 19 £1,045 (Boiler). From £2,690 Installed. Get Quote >

4. ALPHA E-TEC NX

Alpha E-Tec 35 NXS System Boiler - Best boilers in the UK | BoilerhutThe Alpha E-Tec, available as a combi and system boiler, is one of our most popular boilers and is one of the cheaper options. This is great, considering all Alpha NX boilers have the latest version of their stainless steel heat exchanger. These boilers are good for medium-sized homes.

The E-Tec NX features:

  • Up to 7-year warranty
  • Modulation range 1:6
  • 94% efficient condensing boiler

Read our Alpha E-Tec NX review.

MODEL KW PRICE
Alpha E-Tec 33 NX Combi 33 £870 (Boiler). From £2,090 Installed. Get Quote >
Alpha E-Tec 20 NX System 20 £920 (Boiler). From £2,210 Installed. Get Quote >
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5. WORCESTER BOSCH GREENSTAR 4000

Worcester Bosch Condens 4000 Combi Boiler - 5th Best BoilersThe Greenstar 4000 boiler is Worcester’s most popular model. It is a great boiler and comes with a 10-year warranty. It is efficient and reliable. It is compatible with the Bosch Easy Control thermostat and has a “Quick Tap” feature to minimise water wastage.

This boiler has an aluminium heat exchanger rather than a stainless steel one, so we recommend careful consideration due to potential efficiency loss over time.

The 4000 is available as a combi and system boiler in both natural gas and LPG fuel versions. Read our Greenstar 4000 30kW review.

MODEL KW PRICE
Greenstar 4000 Combi 25 £1,540 (Boiler). From £3,140 Installed. Get Quote >
Greenstar 4000 Combi 30 £1,670 (Boiler). From £3,290 Installed. Get Quote >
Greenstar 4000 System 12 £1,420 (Boiler). From £2,820 Installed. Get Quote >

Top Boiler Brands in the UK 2024

When it comes to selecting a new boiler, the brand is more than just a name; it should reassure you by being a testament to quality, innovation, and customer satisfaction.

Some of the top boiler brands are:

  • Viessmann: known for its German-engineered premium boilers and heat exchangers
  • Vaillant: impresses with its quality and innovation
  • Worcester Bosch: the UK’s best-known boiler manufacturer
  • Alpha: offers a balance of affordability and quality
  • Baxi: a strong historical presence and dedication to customer service
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Viessmann

Best boilers in the UK - Viessmann

Viessmann boilers are known for their high efficiency and lifespan. With models like the Viessmann Vitodens 200-W and 111-W leading the market with a remarkable 98% efficiency rating, it’s easy to see why they’ve gained popularity.

Our best pick, the Vitodens 100-W, comes with a 12-year warranty. This shows Viessmann believes in its design, manufacturing, innovative stainless steel heat exchanger, and integrated WiFi.

Quality and dependability of Viessmann are confirmed by accolades like the Which? Best Buy Awards. Being committed to quality and innovation, Viessmann is among the top boiler brands in the UK.

Vaillant

Vaillant is recognised for quality in the boiler industry. Their tradition of delivering top-quality products has given it a loyal customer base throughout the UK. The ecoTEC plus model is a prime example of this, boasting up to 94% efficiency and advanced technology that simplifies control and maximises comfort.

Vaillant has carved out a reputation for producing boilers that deliver exceptional performance, and their commitment to customer satisfaction is reflected in their extensive warranty options and highly regarded after-sales support.

Vaillant boilers are engineered to high standards within the UK, ensuring that each unit meets the demands of British homes. This combination of quality, performance, and support positions Vaillant as a trusted choice when seeking a reliable and efficient boiler.

Worcester Bosch Boilers

Best boilers - Worcester BoschWorcester Bosch is a brand that has been a household name for years. Worcester boilers are known for dependable and high-quality products. Their comprehensive range, including gas, LPG, and oil-fueled options, caters to a wide spectrum of customer needs.

The Greenstar 4000 is one of their most popular, with its sleek design backed by a 10-year warranty. Worcester’s position in the market is due to its exceptional products, dedicated customer service team and extensive network of service engineers.

This support ensures that Worcester not only sells boilers but also provides peace of mind, knowing that assistance is always available.

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Alpha

Alpha - Best boiler brandsAlpha boilers offer a balance between cost and quality. Their range of boilers, including the popular Alpha E-Tec model, comes with a 7-year warranty and efficient condensing technology at a price point that doesn’t break the bank. The brand’s commitment to providing quality without compromise is evident in their robust customer service and after-sales support, making Alpha a brand that homeowners can trust.

With a selection that includes combi, system, and regular boilers, Alpha ensures that there is a fitting option for varying customer needs. The brand’s reputation for reliability continues to grow, fortified by a dedication to excellence that resonates with budget-conscious consumers who still demand high performance from their central heating.

Alpha’s standing in the boiler industry is a testament to their ability to marry affordability with quality, making them a smart choice for the discerning homeowner.

Baxi

Baxi - top boiler brand in the UKBaxi’s storied presence in the boiler market dates back to 1866, cementing its status as a brand with deep roots and a rich heritage. This longevity is complemented by a commitment to innovation, ensuring that Baxi boilers stays at the forefront of the boiler industry.

Recognised for its diverse selection of products, Baxi stands out for offering boilers with healthy warranties, a reflection of the brand’s confidence in their British-manufactured products.

Award-winning customer service and superior aftercare are hallmarks of the Baxi experience, with customers lauding the brand for its performance and durability. Located in Lancashire, Baxi takes pride in providing value for money and ensuring that their customers receive the attention and service they deserve.

When it comes to finding a boiler brand that combines historical prowess with modern excellence, Baxi is a name that resonates with reliability and trust.

Boiler Types and Their Benefits

As important as the brand is the boiler type, which all have special benefits suited to various heating and hot water needs. Choosing between the classic heat-only boiler, the durability of a system boiler, or the convenience of a combi boiler requires knowledge of the subtle differences between each kind.

Combi Boilers

Combi boilersCombi boilers are the most efficient way of heating your home and hot water. They offer a space-saving and cost-effective solution for small to medium-sized homes and apartments. These boilers have several advantages:

  • They are compact enough to fit inside a standard kitchen cupboard, making them ideal for properties with limited space.
  • They heat water on demand, eliminating the need for a hot water storage cylinder.
  • This ensures that energy efficiency is maximised and waste is minimised.
  • Energy-efficient reducing energy bills and providing value for money

For those seeking a reliable combi boiler that offers both convenience and efficiency, a combi boiler is an excellent choice.

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System Boilers

System boilersFor homes bustling with activity and high hot water demand, system boilers are the high-volume choice. Capable of supplying hot water to several taps of showers at the same time, these boilers are a reliable solution for larger households or properties with multiple bathrooms.

What sets system boilers apart is their ability to integrate with solar thermal systems or photovoltaic (PV) solar, providing an eco-friendly option that also helps reduce energy costs.

System boilers offer several advantages:

  • They require a separate hot water cylinder, which can be housed in an airing cupboard, maintaining mains pressure hot water throughout the home.
  • This type of boiler is designed for efficiency and is often accompanied by features such as immersion heaters for additional water heating methods.
  • With annual servicing recommended for optimal performance and safety, a system boiler is a robust and sensible choice for those with higher hot water demands.

Conventional/Heat Only Boilers

conventional boilerConventional, also known as heat-only boilers, is a time-honoured solution that remains relevant for many properties, especially those with older heating systems. These boilers work in tandem with a separate hot water cylinder and cold water storage tank, providing a reliable source of central heating and hot water. Their design is particularly well-suited for areas with low water pressure, ensuring that homeowners can enjoy a consistent supply of hot water and warmth.

The longevity of heat-only boilers is one of their most appealing attributes, with proper maintenance ensuring a lifespan that can surpass that of more modern boiler types. This makes them a suitable investment for older properties where the heating system may not be compatible with newer boiler technologies.

For those seeking a traditional approach to home heating, a conventional boiler offers compatibility and the reliability of reliable boilers that stand the test of time.

Storage Combi Boilers

Storage combi boilers offer an intermediate step between standard combi’s and system boilers. They have an integrated hot water tank and can provide more hot water than a combi boiler of similar power without the need to install expensive hot water cylinders.

The Vitodens 111-W is a perfect example of a storage combi with a 46-litre hot water tank right inside the boiler. The energy efficiency of the 111-W for both central heating and hot water is an industry-leading 98%.

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Choosing the Best Boiler for You

Selecting the right boiler for your home is not a decision to be taken lightly; it requires careful consideration of several key factors. Consideration of the following factors is critical when choosing a boiler:

  • Boiler size
  • Efficiency ratings
  • Warranty length and reliability
  • Brand reputation
  • Type of fuel available
  • Professionalism of the installer

We’ll delve deeper into these considerations, equipping you with the necessary knowledge to make an informed decision.

Efficiency Ratings

The efficiency of a boiler directly correlates with how much of the energy it consumes is converted into usable heat, meaning a higher efficiency rating equals more warmth for less money – and a smaller environmental impact. The Energy-related Products (ErP) label is a legal requirement in the UK, providing a clear rating from A-G, with A-rated boilers signifying the highest energy efficiency.

Furthermore, the Seasonal Efficiency of a Domestic Boiler in the UK (SEDBUK) rating system complements the ErP label by offering efficiency scores in both percentages and A-G rankings. Most new combination boilers boast an A-rating, signifying that they embody the latest in efficient heating technology.

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Warranty Period

The length of a boiler’s warranty reflects the manufacturer’s confidence in their product’s reliability and durability. Longer warranty periods often signal a commitment to quality, with brands like Worcester Bosch and Viessmann leading the way with warranties extending up to 12 years.

Installation and Maintenance

A well-installed boiler can be the difference between a system that runs smoothly for years and one that encounters frequent issues. Combi boilers are particularly known for their less complex and more cost-effective installation due to the absence of external components.

Regular servicing is also essential, helping to maintain operational efficiency and safety while providing the added benefit of identifying potential issues before they escalate.

Fuel Availability

The type of fuel your boiler uses is a big consideration, especially in terms of availability and cost. For those connected to the natural gas network, a gas boiler remains the most common and convenient option. However, for properties off the gas grid, LPG (liquid petroleum gas) serves as a viable alternative, and many boilers are designed to be easily converted to use it. Oil is another option for those who prefer it, though it requires a separate review of the best oil boilers available.

Alternatives to gas boilers, LPG, and oil, such as electric boilers, biomass boilers, and air source heat pumps, require careful consideration. Here are some key points to keep in mind when comparing them to a gas boiler:

  1. Electric boilers offer great efficiency but come with higher energy costs compared to gas, and powerful models may necessitate an upgraded electrical supply.
  2. Biomass boilers, while sustainable, produce more local emissions and have a larger carbon footprint due to the shipping of pellets from abroad.
  3. Air source heat pumps are gaining popularity due to government grants, but most homes might not qualify for installation due to strict guidelines.
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Boiler Features to Look Out For

Beyond brand reputation and boiler type, there are specific features that can greatly impact a boiler’s efficiency, durability, and long-term performance.

  • High power output
  • High-quality components
  • Energy-efficient design
  • Low maintenance requirements
  • Long warranty period

Smart Controls

Smart controls have become a pivotal feature in the efficient management of home heating systems. Technologies like weather compensation can adjust the boiler’s output based on external temperatures, ensuring that your home is always comfortable without wasting energy. Additionally, remote access allow homeowners to control their heating from anywhere, providing both convenience and the ability to make real-time adjustments for optimal efficiency.

Smart thermostats from brands such as Nest, Tado, and Hive ocan learn your routine and automating temperature adjustments based on your location.

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Stainless Steel Heat Exchanger

A boiler’s heat exchanger is the core component that transfers heat from the burner to the water within the system, and the material it’s made from plays a crucial role in its efficacy and lifespan.

Stainless steel heat exchangers are renowned for their:

  • Efficient heat transfer capabilities
  • Ability to withstand the test of time, even in the face of harsh operating conditions
  • Superior resistance to corrosion and thermal stress

Tips for Finding the Best Boiler Deals

Embarking on the quest for the perfect boiler doesn’t end with selecting a model – finding the best deal is just as important. The boiler market can be competitive, and with the right approach, you can uncover opportunities to save on both the boiler and its installation. This can mean the difference between an adequate solution and the ideal heating system for your home, all within your budget.

Consider these expert tips to help you navigate the market and find the best boiler deals, ensuring you get the most value for your investment. Comparing quotes from multiple installers is a smart first step, as installation costs can vary widely. Professional advice can also provide invaluable insights into the best options for your specific circumstances.

Online quoting tools have streamlined the process, with services like Boilerhut offering competitive fixed prices for boilers and installations, eliminating the need to have an installer visit your property. By leveraging these resources and being proactive in your search, you’ll be well on your way to finding the best deals on the market.

Summary

The best boiler works well for you and gives you confidence for the long term. All the leading boiler manufacturers are now producing energy-efficient boilers with ratings of 90% or more so that is less of a worry overall. Of course, the higher the efficiency of the boiler model the better but there may be other considerations you value more.

Reliability is probably one of the questions we get asked the most. The most reliable boilers in the UK are produced by Viessmann. Worcester Bosch, Vaillant and Alpha also make very good boilers will long warranties, but in our experience, the quality of their internal components and manufacturing means very little goes wrong.

Another consideration when installing a new boiler is your existing setup. If you have a combi boiler, replacing it with a combi boiler is going to be the quickest and most cost-effective option. It’s the same with system and conventional boilers. Changing your heating system from a conventional/regular setup to a combi boiler will cost more, but you may get savings in the long term and better performance.

Don’t worry if this is all a lot to take in. There is a lot of information and a lot of choice when it comes to a new boiler. We’d recommend getting quotes from a qualified heating engineer or two. Also, get a few quotes from online-based boiler installation companies, like Boilerhut. We save money by not having to come to your home and complete a survey. It’s all done on the phone.

Good luck, and we’d love to give you an instant personalised, no-obligation quote: it only takes a minute.

Why use Boilerhut for your new boiler?

If you need a new or replacement boiler or are looking at having a central heating system installed, get an online quote, and you’ll get an instant price.

But why choose Boilerhut:

  • Save up to £590 per year on your energy bills, according to the Energy Saving Trust.
  • Quick central heating system installation. Next day boiler installation.
  • 5* Excellent customer service satisfaction on Trustpilot.
  • Boiler finance options available for central heating or boiler installation.
  • 10 to 12-year warranty on boilers.
  • Experienced Gas Safe registered engineers.
  • Fixed prices. No hidden extras.
  • Get up to three quotes for different-tier boilers.
  • Instant, no-obligation quote in less than 1 minute.
  • Annual boiler service with the manufacturer to ensure warranty (annual or monthly charge).