Which type of boiler is right for your home?

Before comparing boiler brands, it's important to choose the right type of boiler for your home. The three main types available in the UK are combi, system and regular boilers, each offering different benefits depending on your property's size and hot water requirements.

Combi boilers

Combi (combination) boilers provide heating and hot water from a single, wall-mounted unit, so there's normally no need for a separate hot water cylinder or cold water tank.They're the most common type of boiler in the UK and are a great choice for smaller and medium-sized homes where space is limited.

System boilers

System boilers normally work with a separate hot water cylinder but don't require a feed and expansion tank. Paired with an unvented cylinder, they’re well-suited to larger homes or households with more than one bathroom, as they can supply hot water to multiple taps or showers at the same time.

Regular boilers

Regular boilers, also known as conventional or heat-only boilers, normally work with a hot water cylinder. They're commonly found in older properties with traditional heating systems and are often the best option when replacing an existing regular boiler.

Comparing the best boiler brands

Now let's take a closer look at what each brand offers and which homes they're best suited to…

Worcester Bosch: Best for all-round performance

If reliability is high on your list, Worcester Bosch is a great place to start. One of the UK's best-known boiler manufacturers, it offers a wide range of combi, system and regular boilers for everything from smaller homes to larger family properties.

Known for dependable performance and straightforward servicing, Worcester Bosch has earned a strong reputation with homeowners and heating engineers alike. Many models available from BOXT are A-rated and over 90% efficient, helping to reduce energy use and running costs.

Why choose a Worcester Bosch boiler from BOXT?

Worcester Bosch boilers are consistently well-engineered and easy to maintain, with readily available replacement parts. That helps keep servicing straightforward throughout the boiler's lifetime and makes them a dependable choice for homeowners.

Key information

• Best for: Homeowners looking for a reliable, all-round boiler with long-term peace of mind

• Price range: From £2,199

• Warranty: Up to 10 years, depending on the model and installation*

• Awards and accreditations: Selected models have received multiple Which? Best Buy recommendations†

• Fuel types: Gas and LPG

• Boiler types: Combi, system and standard

Popular Worcester Bosch boilers

BOXT offers a range of Worcester Bosch boilers to suit different homes and heating requirements. Some of our most popular models include:

• Greenstar 4000 – Our best-selling boiler, the Greenstar 4000, is a quiet, energy-efficient combi boiler that's ideal for small to medium-sized homes. The 4000 is also available as a system boiler.

• Greenstar Ri – A compact regular boiler designed for homes with an existing conventional heating system.

• Greenstar 8000 – A premium boiler with higher outputs, making it a great choice for larger homes with greater heating and hot water demand.  The 8000 is available as combi, system and heat only models. While the 8000 F is a large floor standing combi suitable for larger homes with high hot water demand.

• Greenstar CDi – A powerful combi boiler designed for homes that need strong heating and hot water performance.

Vaillant: Best for quiet operation

If you're looking for a boiler that's quiet, efficient and built to last, Vaillant is well worth considering. Established in 1874, the German manufacturer has more than 150 years of heating expertise and offers a range of combi, system and regular boilers for a wide variety of homes.

Known for its premium engineering and innovative technology, Vaillant produces some of the quietest boilers on the market, with selected models carrying Quiet Mark accreditation. Many models are also highly energy-efficient, with efficiencies of up to 98%, helping reduce energy use and running costs.

Why choose a Vaillant boiler from BOXT?

Vaillant boilers are exceptionally well engineered, and among the quietest we install. They're a great choice for homeowners looking for premium performance, energy efficiency and long-term reliability.

Key information

• Best for: Homeowners looking for a quiet, high-quality boiler
• Price range: From £2,419
• Warranty: Up to 10 years, depending on the model and installation*
• Awards and accreditations: Quiet Mark approved on selected models†
• Fuel types: Gas
• Boiler types: Combi, system and standard

Popular Vaillant boilers

BOXT offers a range of Vaillant boilers to suit different homes and heating requirements. Some of our most popular models include:

• ecoFIT pure – A compact boiler that's ideal for homes where space is limited and can fit neatly inside a kitchen cupboard.

• ecoTEC Plus – A versatile, high-performance boiler available in a range of outputs, making it a great choice for larger homes with higher heating and hot water demand.

• ecoTEC Exclusive Green iQ – A premium boiler with advanced energy-saving features and compatibility with smart heating controls.

Ideal: Best for value for money

If you're looking for a boiler that balances performance, efficiency and affordability, Ideal is a great place to start. Established in 1906, the British manufacturer has built a strong reputation for producing reliable combi, system and regular boilers that offer excellent value for money.

All Ideal boilers available from BOXT have an ErP A rating for heating and hot water, with efficiency over 90%. Combined with competitive pricing, they offer an affordable way to upgrade your heating system without compromising on energy efficiency.

Why choose an Ideal boiler from BOXT?

Ideal boilers offer an excellent balance of performance, efficiency and affordability. They're a great option for homeowners looking for dependable heating, generous warranties and long-term value.

Key information

• Best for: Homeowners looking for excellent value without compromising on quality
• Price range: From £1,745
• Warranty: Up to 10 years, depending on the model and installation*
• Energy efficiency: A-rated and over 90% efficient on selected models†
• Fuel types: Gas
• Boiler types: Combi, system and standard

Popular Ideal boilers

BOXT offers a range of Ideal boilers designed to suit different homes and heating requirements. Some of our most popular models include:

• Logic² Max – A compact, energy-efficient boiler available as a combi, system or regular model, making it a great choice for a wide range of homes.

• Logic+ – A compact combi boiler with built-in frost protection and an A energy rating, ideal for smaller properties.

• Vogue Max – A premium boiler with advanced features and excellent efficiency for homeowners looking for enhanced performance.

Navien: Best for smart technology

If smart features and hot water performance are high on your list, Navien is well worth considering. One of the world's largest boiler manufacturers, the brand is known for combining innovative technology with reliable, energy-efficient heating.

Selected Navien models achieve efficiency ratings of up to 98% and include features such as weather compensation and smartphone connectivity, making it easier to manage your heating while reducing energy use.

Why choose a Navien boiler from BOXT?

Navien boilers combine excellent hot water performance with intuitive smart features at a great price. They're rigorously tested for quality and built to deliver reliable everyday heating.

Key information

• Best for: Homeowners looking for smart features and excellent hot water performance
• Price range: From £1,790
• Warranty: Up to 10 years, depending on the model and installation*
• Fuel types: Gas and LPG
• Boiler types: Combi

Popular Navien boilers

BOXT offers a range of Navien combi boilers designed to suit different homes and heating requirements. Some of our most popular models include:

• NCB500 ON – A powerful combi boiler that's ideal for family homes with higher heating and hot water demand.

• NCB300 – A compact combi boiler designed for smaller homes. The 30kW model is exclusive to BOXT, giving you access to a model that's not widely available elsewhere.

Baxi: Best for compact homes

If you're looking for a straightforward, reliable boiler that doesn't take up too much space, Baxi is a great option. Established in 1866, the British manufacturer has built a reputation for producing dependable boilers that combine everyday performance with practical design.

Many Baxi boilers feature compact dimensions, making them well suited to homes where installation space is limited. Selected models are also A-rated for energy efficiency and come with up to 10-year warranties, offering long-term value and peace of mind.

Why choose a Baxi boiler from BOXT?

Baxi boilers are reliable, easy to install and maintain. Their compact design makes them a practical choice for a wide range of homes.

Key information

• Best for: Smaller homes and compact spaces
• Price range: From £2,979
• Warranty: Up to 10 years, depending on the model and installation*
• Energy efficiency: A-rated on selected models†
• Fuel types: Gas
• Boiler types: Combi

Popular Baxi boilers

BOXT currently offers the Baxi 600, a versatile combi boiler that's designed to deliver dependable heating and hot water in a compact unit. It's well-suited to flats, smaller family homes, and properties with limited space.

Other boiler brands worth considering

While BOXT installs boilers from a carefully selected range of manufacturers, there are other reputable brands available in the UK. If you're researching your options, these are two names you'll often come across.

Viessmann: Best for energy efficiency

If reducing running costs is your priority, Viessmann is a brand worth considering. The German manufacturer is known for producing highly efficient boilers, with selected models achieving efficiency ratings of up to 98%.*

Many Viessmann boilers also feature the brand's stainless-steel Inox-Radial heat exchanger, which is designed to enhance durability and long-term performance. Combined with generous warranties on selected models, Viessmann has become a popular choice for homeowners looking to maximise efficiency.

Glow-worm: Best for tighter budgets

Glow-worm has built a reputation for producing straightforward, affordable boilers that offer reliable everyday heating. Its range includes compact models well-suited to smaller homes, making it a popular option for homeowners looking to keep upfront costs down.

While Glow-worm boilers can represent good value, it's worth comparing warranty lengths, features, and servicing options with those of other manufacturers before making your final decision.

How to choose the right boiler for your home

Once you've narrowed down the boiler brands you're interested in, the next step is choosing the right model for your home. The best boiler isn't always the most expensive or the most powerful, it's the one that's the right fit for your property, heating needs and budget. Here are a few things to consider before making your decision.

Think about your home's heating needs

The size of your home and your household's hot water demand should be one of the first things you consider. For example, if you have a larger home or more than one bathroom, you may need a higher-output boiler or a different type to ensure everyone has access to heating and hot water when they need it.

Most boiler models are available in a range of output options, allowing you to choose one that's suitable for your home's current and future heating and hot water needs. If you're planning to renovate your home, add another bathroom with extra taps or install extra radiators, you may need to choose a boiler with a higher output. Choosing the right output is just as important as choosing the right brand.

Compare the long-term costs

It's easy to focus on the upfront cost of a new boiler, but it's worth looking at the bigger picture too. A more energy-efficient boiler may cost more initially, but it could help reduce your energy bills over time if you're replacing an older, less efficient model. You can also use our boiler savings calculator to estimate how much you could save by upgrading.

You should also consider ongoing costs, such as servicing, maintenance and warranty cover, as these can make a difference over the lifetime of your boiler.

Look at energy efficiency

Modern boilers are far more efficient than older models. All new boilers are A-rated and over 90% efficient, helping to make better use of the fuel they use. If you're replacing an older boiler, upgrading to a modern, energy-efficient model could help reduce your energy bills while keeping your home warm and comfortable.

Check the warranty

A manufacturer's warranty can give you extra peace of mind, so it's worth comparing what's included. Longer warranties often reflect a manufacturer's confidence in its products, but it's also worth checking what's covered and any servicing requirements needed to keep the warranty valid.

Get advice from a heating expert

If you're still unsure which boiler is best for your home, it's always worth speaking to a qualified heating engineer. They can recommend the right boiler type, size and output based on your property and hot water requirements.

Or, if you'd rather compare your options online, BOXT's comparison tool does the hard work for you. It recommends boilers based on your home and heating needs, so you'll only see models that are suitable for your property. From there, you can compare leading brands, warranties and prices to find the boiler that's right for you.

We also recommend getting more than one quote before making your final decision. If you find a like-for-like installation elsewhere, BOXT's Price Match Promise gives you added confidence that you're getting great value.

Why choose BOXT for your new boiler?

Choosing the best boiler brand is only part of the decision. It's just as important to choose an installer you can trust.

At BOXT, we've made replacing your boiler simple. Our online comparison tool recommends boilers suitable for your home, so you can compare leading brands, warranties, and prices before making your decision.

When you choose BOXT, you'll benefit from:

• Fixed-price quotes online in as little as 60 seconds

• Installation by one of our nationwide network of 15,000+ registered engineers

• Manufacturer-backed warranties of up to 12 years on selected boilers

• BOXT's Price Match Promise on like-for-like installation quotes

• Flexible finance options, including 0% finance on selected products

• A 12-month workmanship guarantee for added peace of mind

• Professional installation as soon as the next working day**

Whether you're looking for a Worcester Bosch, Vaillant, Ideal, Baxi or Navien boiler, BOXT makes it easy to compare your options and book a professional installation at a fixed price, with no hidden costs.

Ready to find the right boiler?

Choosing a new boiler can feel like a big decision, but comparing the best boiler brands is a great place to start. By weighing up warranties, energy efficiency, features and value for money, you can find the right boiler for your home. Once you've decided on the brand, BOXT can help you compare suitable models, receive a fixed-price quote in minutes and arrange installation by a BOXT-accredited Gas Safe registered engineer.

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*Prices are correct as of July 2026 and may vary depending on the boiler model, output and installation requirements.

** When ordered before 3pm