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Last updated on December 13th, 2023 at 10:27 am

Heating systems are a vital component of any home, providing warmth and comfort during the colder months. When it comes to choosing the right boiler for your home, you may find yourself faced with various options.

Two of the most popular choices are combi boilers and condensing boilers. Understanding the differences between these two types of boilers is crucial for making an informed decision that suits your heating needs and preferences.


Operation and Functionality

Combi Boiler: A combi (combination) boiler, also known as a combination boiler, is designed to provide both central heating and hot water from a single unit. It operates by heating water on demand, eliminating the need for a separate hot water storage tank. Combi boilers are known for their efficiency and space-saving design.

Condensing Boiler: A condensing boiler is a type of boiler that is highly efficient and extracts as much heat as possible from the combustion process. It typically requires a separate hot water storage tank, making it suitable for homes with higher hot water demand.


Combi Boiler: Combi boilers are known for their high energy efficiency. They can be up to 90-98% efficient, as they only heat water when needed, reducing energy wastage.

Condensing Boiler: Condensing boilers are also highly efficient, often operating at around 90-95% efficiency. They achieve this by recycling the heat from the exhaust gases, which would otherwise be lost in a non-condensing boiler.

Hot Water Supply

Combi Boiler: Combi boilers are excellent for providing hot water on demand. They are ideal for smaller households or homes with limited space, as they don’t require a separate hot water storage tank.

Condensing Boiler: Condensing boilers can provide a large and constant supply of hot water due to the presence of a hot water storage tank. They are more suitable for larger households with higher hot water demands.

Installation and Space

Combi Boiler: Combi boilers are relatively compact and do not require a separate hot water tank. This makes them easier to install and ideal for homes with limited space.

Condensing Boiler: Condensing boilers, on the other hand, require more space due to the inclusion of a hot water storage tank. Installation can be more complex, especially if you don’t already have a tank in place.


Combi Boiler: Combi boilers are generally more cost-effective in terms of installation, as they require less labour and equipment. However, they may not be the most efficient option for larger homes with higher hot water needs.

Condensing Boiler: While condensing boilers can be more expensive to install, they are often the better choice for larger homes and families with greater hot water requirements. Over time, their efficiency can lead to energy cost savings.

What Type Of Boiler Should I Choose?

In summary, the choice between a combi boiler and a condensing boiler depends on your specific needs and the characteristics of your home. Combi boilers are efficient, compact, and ideal for smaller households with limited space. They provide hot water on demand, saving energy and reducing heating costs.

On the other hand, condensing boilers are suitable for larger households with greater hot water demands. They provide a constant supply of hot water and can be highly energy-efficient in the long run.

Ultimately, it’s essential to assess your household’s hot water requirements and available space before making a decision. Consider your budget and energy efficiency goals as well. Both types of boilers have their advantages and can provide reliable heating and hot water, but choosing the right one will ensure that your home is comfortable, efficient, and cost-effective in the long term.

Speak To Warmable Today

Get in touch with Warmable today for all of your boiler needs. We can quickly match you with a local boiler fitter in your area who can visit you on site to carry out a boiler installation, service or repair. Consulting with a professional heating engineer can help you make an informed decision tailored to your unique needs and circumstances.

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Andrew Speer

Andrew Speer is the co-founder of Warmable drawing on more than 15 years of experience working in property and home repairs industry in the UK