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Updated: September 26, 2024

When choosing a combi boiler, the decision goes beyond just heating efficiency. You’re investing in long-term comfort, energy savings, and reliability. This guide provides a detailed overview of the best combi boilers available in the market, helping you navigate the top models and brands for your home or business.

Key Factors to Consider When Choosing a Combi Boiler

Before diving into specific brands and models, understanding the key factors that influence your decision is crucial. Here are the top considerations:

Energy Efficiency

Energy-efficient boilers save money on heating bills and reduce your carbon footprint. Most top-rated combi boilers come with an A-rating, ensuring optimal efficiency.

Boiler Output

The output you need depends on the size of your home and your water usage. Smaller homes may be fine with a 24kW boiler, while larger homes may require up to 50kW.

Reliability and Maintenance

A boiler’s reliability is crucial to avoid frequent breakdowns. Look for boilers with robust customer reviews, long warranties, and easy access to replacement parts.

Warranty Length

The length of the warranty reflects the manufacturer’s confidence in the product. Some of the best combi boilers come with warranties of up to 10 years, covering parts and labor.

Best Combi Boilers to Buy in 2024

Let’s explore the top five combi boiler brands, breaking down the features, performance, and key models of each.

1. Worcester Bosch – Best Overall

Worcester Bosch is one of the most trusted names in the UK boiler market, consistently earning top ratings from installers and heating engineers.

Why Worcester Bosch?

  • 10-Year Guarantee
  • Which? Best Buy Award for 10 Years
  • Wide availability of parts
  • High-efficiency, A-rated models
  • User-friendly digital displays

Worcester Bosch Greenstar i Review

The Worcester Bosch Greenstar i is the brand’s bestseller, with over a million units installed in the UK. It’s available in two models—30kW and 25kW, making it ideal for small to medium-sized homes. Despite being an entry-level model, it offers exceptional energy efficiency and has earned the Which? Best Buy Award.

Worcester Bosch 2000 Review

The Worcester Bosch 2000 is another popular entry-level option, particularly suited for small homes and apartments. This boiler is the brand’s quietest and is compact enough to fit in a kitchen cupboard. With an A-rating for efficiency and an easy-to-use display, it’s perfect for those on a budget.

Read about: Top UK Heat Only Boilers

2. Viessmann – Best for Innovation

Viessmann is a relatively new brand in the UK but has quickly gained recognition for its innovation and reliability, especially in the European market.

Why Viessmann?

  • High-quality stainless steel heat exchangers
  • 10-year guarantee
  • Advanced smart features
  • Hydrogen-ready technology
  • Exceptional customer reviews

Viessmann Vitodens 050-W Review

The Vitodens 050-W is an entry-level combi boiler, offering high performance at a competitive price. Available in 29kW and 35kW models, it’s perfect for small and medium-sized homes. The stainless steel Inox-Radial heat exchanger ensures durability, and the boiler is compact enough to be wall-mounted.

Viessmann Vitodens 100-W Review

The Vitodens 100-W is Viessmann’s best-selling model, with an updated design featuring hydrogen-ready technology and an improved LCD touchscreen display. The integrated Wi-Fi allows for remote monitoring and diagnostics, making it a top choice for homeowners who value cutting-edge technology.

Viessmann Vitodens 100-W, B1HC 26 – Free flue kit

Read about: Different Types Of Reliable Boiler Systems

3. Vaillant – Best for UK Manufacturing

Vaillant is a well-known German-owned brand with a long history of producing reliable boilers. Made in the UK, Vaillant boilers are highly regarded for their ease of repair and energy efficiency.

Why Vaillant?

  • Made in the UK
  • Quiet Mark certification for silent operation
  • High energy efficiency
  • Flexible installation options
  • Extended warranties when installed by a certified technician

Vaillant EcoTec Pro Review

The EcoTec Pro is one of Vaillant’s top models, available in 24kW, 28kW, and 30kW outputs. It is Quiet Mark certified, making it one of the quietest boilers on the market. Ideal for small to medium-sized homes, the EcoTec Pro is also highly energy-efficient, reducing heating costs over time.

Vaillant EcoFit Pure Review

The EcoFit Pure is designed for homes with limited space. This compact boiler fits neatly into a kitchen cupboard and offers flexible flue options for easier installation. Despite its small size, it provides excellent energy efficiency, making it a popular choice for apartments and smaller properties.

4. Alpha – Best for Budget Buyers

Alpha is a newer entrant in the UK market, known for delivering reliable boilers at affordable prices. While budget-friendly, Alpha does not compromise on quality.

Why Alpha?

  • Affordable pricing
  • Stainless steel heat exchangers
  • 10-year guarantee
  • Compact designs
  • High energy efficiency

Alpha E-Tec Review

The Alpha E-Tec is a standout in the budget category, featuring a stainless steel heat exchanger typically found in more expensive models. Despite its affordable price, the E-Tec comes with a 10-year warranty and is designed to last, making it a great choice for cost-conscious buyers.

Read about: Boilers On Finance

Read more: New Boiler Quote

5. Baxi – Best for Customer Service

Baxi is a British-based manufacturer with a long-standing reputation for excellent customer service and nationwide coverage. Although it’s not typically seen as a premium brand, Baxi boilers are known for their durability and ease of use.

Why Baxi?

  • Made in the UK
  • Outstanding customer service
  • 7-year no-quibble warranty
  • EasyFill technology for maintaining pressure
  • Smart thermostat compatibility

Baxi 600 Combi Boiler Review

The Baxi 600 is designed with feedback from installers, making it easy to install in small spaces. Available in 24kW to 36kW outputs, the Baxi 600 is ideal for small to medium homes. Innovative features such as EasyFill make maintaining pressure easier than ever before. It also supports smart thermostats, allowing homeowners to control their heating via a smartphone app.

How to Choose the Right Combi Boiler for Your Home

Choosing the right combi boiler comes down to a few key factors:

Size of the Property

Smaller homes with one bathroom might only require a boiler with a 24kW output, while larger homes with multiple bathrooms might need up to 50kW.

Hot Water Demand

If your home has high hot water demand, consider a storage combi boiler, like the Viessmann Vitodens 111-W, which offers integrated water storage to meet higher demands.

Energy Efficiency

Check for boilers with an A-rating for energy efficiency. Brands like Worcester Bosch, Viessmann, and Vaillant offer high-efficiency models that will save you money in the long run.

With us here at Let’s Heat you can get an online quote now to see how much we can install it for: Get Quote Now!

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FAQ’s

What are the best combi boilers to buy?

1- Worcester Bosch
2- Viessmann
3- Vaillant
4- Baxi
5- Alpha

Which boiler brand is the most reliable?

Top 10 best boiler brands
#1 Viessmann Boilers.
#2 Worcester Bosch.
#3 Valliant Boilers.
#4 Baxi Boilers.
#5 Alpha Boilers.
#6 Ideal Boilers.
#7 Glow Worm Boilers.
#8 Potterton Boilers.

How do I choose a new combi boiler?

When choosing a new combi boiler, consider factors such as the size of your property, the number of occupants, hot water demand, and energy efficiency ratings. It’s advisable to consult with a heating professional who can assess your specific requirements and recommend the most suitable combi boiler for your situation.

What is the best size combi boiler?

The best size combi boiler depends on the specific heating and hot water demands of your property. Factors such as the number of bathrooms, showers, and radiators, as well as your hot water usage patterns, should be considered. A heating professional can assess your needs and recommend the appropriate size of combi boiler for optimal performance and efficiency.