Best Combi Boiler in the UK: Top 5 Models Compared

Updated June 1st, 2023

When it comes to heating your home efficiently, a combi boiler is an excellent choice. Combi boilers, also known as combination boilers, provide both central heating and hot water on demand, eliminating the need for a separate water tank. In this article, we will explore the benefits of combi boilers and guide you in choosing the best one for your needs.

Factors to Consider When Choosing a Combi Boiler:

Energy Efficiency

One of the most important factors to consider when selecting the best combi boiler is its energy efficiency. Opting for a high-efficiency model not only helps reduce your carbon footprint but also saves you money on energy bills. Look for boilers with high-efficiency ratings and advanced features like modulating burners and weather compensation controls.

Size and Output

Choosing the right size and output for your combi boiler is crucial to ensure optimal performance and comfort in your home. Consider factors such as the number of bathrooms, radiators, and the overall size of your property. A professional heating engineer can help you determine the appropriate size and output required to meet your heating demands.

Cost and Budget

Setting a budget for your combi boiler purchase is essential. Consider both the upfront cost of the boiler and the long-term savings it can provide. Compare prices and features to find a balance between affordability and performance. Remember to factor in installation costs if you’re not planning to install it yourself.

Warranty and After-sales Support

It’s important to choose a combi boiler from a reputable manufacturer that offers a substantial warranty period. A longer warranty not only provides peace of mind but also reflects the manufacturer’s confidence in their product. Additionally, look for companies with reliable after-sales support to ensure prompt assistance if you encounter any issues.

Top 5 Best Combi Boilers in the UK

Now, let’s delve into the top 5 combi boilers available in the UK market. We have carefully reviewed and compared these models based on their features, pros, and cons. Please note that individual needs may vary, so consider your specific requirements before making a final decision.

1. Viessmann Vitodens 050

Key Features

  • Compact design for easy installation and flexibility
  • Efficient and reliable performance
  • Modulating MatriX cylinder burner for optimal combustion
  • Inox-Radial stainless steel heat exchanger for durability
  • User-friendly control interface


  • High energy efficiency, reducing energy bills
  • Quiet operation
  • Low emissions for environmentally friendly heating
  • Long-lasting performance
  • Easy maintenance


  • Relatively higher upfront cost compared to some other models
  • Requires professional installation and regular servicing for optimal performance

2. Worcester Bosch Greenstar 4000

Key Features

  • Compact size and lightweight design for easy installation
  • High energy efficiency and reduced emissions
  • Quiet operation with a low noise level
  • User-friendly control panel
  • Compatible with smart thermostats for enhanced control


  • Reliable and durable performance
  • Energy-saving features, reducing energy consumption
  • Suitable for small to medium-sized homes
  • Easy installation and maintenance
  • Good customer support and warranty options


  • Initial cost may be higher compared to other models
  • May not be suitable for larger homes with higher hot water demands

3. Worcester Bosch Greenstar 2000

Key Features

  • Compact and space-saving design
  • Energy-efficient performance
  • Quiet operation
  • Easy-to-use control knobs
  • Compatible with a range of Worcester Bosch accessories


  • Reliable and consistent heating and hot water supply
  • Affordable price point
  • Suitable for small to medium-sized properties
  • Easy installation and servicing
  • Good customer support and warranty options


  • May not be ideal for larger properties with high hot water demand
  • Limited advanced features compared to higher-end models

4. Ideal Logic C30

Key Features

  • Compact and lightweight design
  • High energy efficiency
  • User-friendly controls with a digital display
  • Low NOx emissions for reduced environmental impact
  • Frost protection for cold weather conditions


  • Reliable and consistent heating and hot water performance
  • Affordable pricing
  • Easy installation and maintenance
  • Suitable for small to medium-sized homes
  • Quiet operation


  • May not be as energy-efficient as some other models
  • Limited advanced features and customization options

5. Viessmann Vitodens 100-w

Key Features

  • High energy efficiency for reduced energy bills
  • Stainless steel Inox-Radial heat exchanger for reliability
  • Quiet operation
  • User-friendly control interface with digital display
  • Compatibility with smart home systems


  • Excellent energy efficiency, reducing running costs
  • Long-lasting performance and durability
  • Compact design for flexible installation options
  • Low NOx emissions for environmental friendliness
  • Reliable brand with good customer support


  • Higher initial cost compared to some other models
  • Requires professional installation and regular servicing for optimal performance

Installation and Maintenance of Combi Boilers

Installing a combi boiler may seem daunting, but with the right guidance, it can be a manageable task. We provide a step-by-step installation guide that includes safety precautions and tips for beginners. However, it’s always recommended to hire a qualified heating engineer for complex installations. Additionally, we emphasise the importance of regular maintenance and servicing to ensure the longevity and efficiency of your combi boiler.


Choosing the best combi boiler for your home is a crucial decision that can significantly impact your comfort, energy efficiency, and cost savings. Consider the factors discussed in this article, such as energy efficiency, size, cost, warranty, and after-sales support. Based on our comprehensive review, we recommend the Viessmann Vitodens 050 as the best combi boiler in the UK. Make an informed decision and enjoy the benefits of a reliable and efficient combi boiler in your home.

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