Best Boilers & Boiler Brands in the UK – The Top 5
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 cost of a new boiler 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. Read all about the Vitodens 100-W combi boiler here.
- The top boiler brands in the UK in 2025, 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.
What are the best boilers in the UK?
The top 5 boiler brands in the UK are Viessmann, Vaillant, Alpha, Worcester Bosch, and Vokera. But remember, the best boiler will depend on your home as well as hot water and heating needs.
Here are the best boiler models to consider for your home:
1. VIESSMANN VITODENS 100-W (BEST BOILER IN THE UK)
The 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, or read our Viessmann reviews to learn more about the company.
| MODEL | KW | PRICE |
|---|---|---|
| Vitodens 100-W 26kW Combi | 26 | £1,430 (Boiler). From £2,760 Installed. |
| Vitodens 100-W 11kW System | 11 | £1,330 (Boiler). From £2,860 Installed. |
| Vitodens 100-W 19kW Heat-Only | 19 | £1,247 (Boiler). From £2,790 Installed. |
| Vitodens 111-W 32kW Storage Combi | 32 | £1,980 (Boiler). From £3,340 Installed. |
2. VAILLANT ECOTEC PLUS
The 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. |
| Vaillant ecoTEC plus 835 Combi | 35 | £1,690 (Boiler). From £3,090 Installed. |
| Vaillant ecoTEC plus 418 Regular | 18 | £1,288 (Boiler). From £2,910 Installed. |
3. VIESSMANN VITODENS 050-W
This 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. |
| Vitodens 050-W 19kW System | 19 | £1,045 (Boiler). From £2,690 Installed. |
4. ALPHA E-TEC NX
The 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. |
| Alpha E-Tec 20 NX System | 20 | £920 (Boiler). From £2,210 Installed. |
5. WORCESTER BOSCH GREENSTAR 4000
The 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. |
| Greenstar 4000 Combi | 30 | £1,670 (Boiler). From £3,290 Installed. |
| Greenstar 4000 System | 12 | £1,420 (Boiler). From £2,820 Installed. |
Top Boiler Brands in the UK
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
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
Worcester 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.
Alpha
Alpha 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’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.
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.
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:
- Electric boilers offer great efficiency but come with higher energy costs compared to gas, and powerful models may necessitate an upgraded electrical supply.
- Biomass boilers, while sustainable, produce more local emissions and have a larger carbon footprint due to the shipping of pellets from abroad.
- Air source heat pumps are gaining popularity due to government grants, but most homes might not qualify for installation due to strict guidelines.
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.
- 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.
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).
