What type of fuel is typically used in combination boilers?

Combination boilers are designed to provide both heating and hot water and are often used in residential settings. The primary fuels used in these systems are gas and oil because they are readily available, efficient, and capable of delivering the required heat output for both heating and hot water applications.

Gas is particularly popular for combination boilers due to its convenience, control, and lower emissions compared to other fossil fuels. Oil can also be used, especially in areas where natural gas service is not available.

While electricity, coal, wood, and biofuels can serve as energy sources for heating systems, they are not typically the main fuels in combination boilers. Electric-only systems can lack the efficiency and heating capacity needed for larger applications, while coal and wood introduce more complexity in terms of storage, handling, and emissions. Biofuels may be used in eco-friendly systems but are less common in traditional combination boiler designs.