Understanding the Pros and Cons of Combi, Regular, and System Boilers

When it comes to choosing a new boiler, whether for a domestic or commercial setting, it’s important to understand the differences between the three main types of boilers available on the market: Combi, Regular and System boilers. Each type has its own key features and benefits that make them suitable for different sized properties and varying hot water demands.

Combi Boilers

Combi boilers are the most popular choice in the UK. This is thanks to their small and compact size, which makes them quick and easy to install. These boilers combine a high-efficiency water heater and a central heating boiler in one compact unit. They heat water directly from the mains, which means there is no need for a hot water storage cylinder or cold water storage tank in the roof space. Combi boilers are energy-efficient and cost-effective because water is heated instantly rather than being stored in a cylinder. They also deliver hot water at mains pressure, which means you can enjoy a powerful shower without the need for a separate pump. They are ideal for smaller homes that don’t need many taps running at the same time. However, they may not be the best choice for larger families with multiple outlets such as the shower and the kitchen tap being used simultaneously.

System and Regular boilers, on the other hand, are used in conjunction with separate hot water cylinders or tanks.

System Boilers

These boilers are a good choice for larger homes with more than one bathroom. They require a cylinder for storing hot water, but the major heating and hot water system components are built into the boiler itself, making it quicker and easier to install. There is no need for a tank in the loft, which is especially useful if you have little or no loft space or are planning a conversion. System boilers are also compatible with solar water heating systems, which can lower your energy bills and reduce your carbon footprint.

Regular Boilers

If you have a traditional heating and hot water system that is linked to a separate hot water cylinder, a regular boiler may be the best option for you. Regular boilers, also known as traditional, conventional, or heat-only boilers, are well-suited for homes where a lot of hot water is used at the same time, such as homes with two or more bathrooms. They are also a good option in areas where water pressure is low. However, regular boilers do require a cold water storage tank in the loft to feed the hot water cylinder, as well as a tank that maintains the water level of the central heating system.

When upgrading or replacing your boiler, it’s important to consider factors such as the size of your property, the number of bathrooms, and your existing heating and hot water system when making your decision. solv can discuss your domestic or commercial boiler installation requirements to ensure you receive the most cost-effective solution for your property.


Replacing an old gas boiler with a new, high-efficiency condensing boiler can save you up to £205 per year on your heating bills, as well as reducing your carbon footprint. The exact amount of savings will depend on the efficiency of the old boiler and the new boiler, as well as factors such as the size of your home, how well insulated it is, and how much hot water you use.

We install boilers from a range of manufacturers including Worcester, Ideal and Valliant. As a Worcester accredited installer, we offer a long-term warranty on Worcester boilers which protects against breakdowns or faulty parts. Overall, upgrading to a new, high-efficiency condensing boiler is likely to result in significant energy and cost savings, as well as reducing your environmental impact.

Ultimately, we will be able to guide you and recommend the best boiler type and make to fit your budget and requirements as we understand that every property is different.

Call us on 028 9592 2630 to talk to our knowledgeable team.