What are dual-fuel appliances capable of using?

Dual-fuel appliances are designed to utilize two different types of fuel sources, which usually enhances their operational flexibility, efficiency, and reliability. The correct option identifies that these appliances can use both electricity and propane. This means that, in cases where one fuel source is unavailable or less efficient, the appliance can switch to the other fuel, ensuring continuous operation.

Using both electricity and propane allows consumers to benefit from the advantages of each fuel type, optimizing performance based on availability or cost-effectiveness. This adaptability is especially useful in various applications ranging from home heating to cooking, providing users with multiple energy source options to meet their needs.

In contrast, the other options are focused on single fuel types or combinations that don’t align with the dual-fuel definition, emphasizing why propane and electricity is the appropriate answer.