What does "dual-fuel" refer to regarding gas appliances?

The term "dual-fuel" in the context of gas appliances specifically refers to appliances that can operate on either natural gas or propane. Dual-fuel appliances are designed with the flexibility to run on both types of fuel, allowing users to choose the fuel source based on availability, cost, or preference. This adaptability is particularly useful in regions where one type of gas may be more readily available or where consumers might switch between fuels for various reasons.

Understanding this concept is crucial for proper appliance selection and usage in residential or commercial settings. Recognizing the advantages of dual-fuel appliances can lead to increased efficiency and cost-effectiveness for consumers. The other options do not accurately describe what dual-fuel means; for example, appliances that run solely on natural gas or electric/gas combinations do not have the same flexibility that dual-fuel appliances provide.