Gas-diesel boilers

Combined (gas/diesel)

— boilers can run on gas and liquid fuels (usually diesel, compatibility with other types of fuel is very rare). It allows you to switch between energy sources if necessary — for example, to work most of the time on gas, keeping a supply of diesel fuel in case of interruptions in the gas supply. However, such boilers are more expensive than single-fuel ones. And when switching from one fuel to another, a burner replacement will be required. For specific fuels, see the relevant paragraphs.