Combination Boilers

Modern combination boilers utilise condensing technology to heat water efficiently by capturing latent heat from exhaust gases.

When you need heating or hot water, the gas burner in the combi boiler ignites. The heat generated by the flame transfers through the main heat exchanger to the primary circuit, directing warmth either to the radiators or to your taps via a plate heat exchanger.

Additionally, many contemporary combi boilers feature a pre-heat system that allows them to store a small volume of water at your preferred temperature throughout the day. This ensures that hot water is readily available at your tap with minimal wait time.

• A major advantage of a combi boiler is its compact design. Since it doesn't require separate storage tanks, everything—heating and hot water—is managed through a single unit. This makes it easy to install and allows for seamless integration into kitchen cupboards, bathrooms, and airing cupboards.

A key benefit of a combi boiler is its impressive energy efficiency. Many modern models are equipped with a flue gas heat recovery system, which captures the gases produced during combustion and utilizes them to heat incoming water. This innovative approach allows the boiler to consume less fuel while achieving efficiency ratings exceeding 90%, ultimately leading to lower energy bills for households.

• Buying a single combi boiler can be more cost-effective than purchasing several individual components, especially when compared to the installation of a traditional system that often requires tanks, hot water cylinders, pumps, and more.
•  Combi boilers are an excellent option due to their ability to quickly heat water on demand. Unlike system boilers and open vent boilers that preheat and store specific amounts of water, combi boilers deliver hot water only when it’s needed. This means they can offer a continuous supply of hot water for your needs.

The downsides of a combi boiler are:

• A combi boiler has a limited water capacity due to its compact size, meaning it can only supply a certain amount of hot water at any given time. As a result, most standard combi boilers can effectively serve only one tap or outlet at once. 
• While many smaller homes are well suited to a combi boiler, larger properties with multiple bathrooms typically require a higher hot water flow rate than a combi boiler can deliver. In such cases, a system boiler is often a better option, as it includes an external hot water cylinder and offers mains-pressure hot water.
• Combi boilers draw water directly from the mains. This can cause a noticeable drop in water pressure when multiple taps or showers are used simultaneously. For this reason, larger homes are often better served by an open-vent or system boiler, which store hot water in a dedicated cylinder (commonly located in an airing cupboard) to ensure a steady supply across multiple outlets.