What is classified as an extra-heavy duty cooking appliance?

An extra-heavy duty cooking appliance is classified primarily based on its capability to handle high-volume cooking and its construction designed for such rigorous use. An appliance utilizing open flame combustion typically falls into this category because it is generally designed for commercial use or high-capacity cooking environments. These appliances are built with materials and components that withstand the demands of heavy usage, making them suitable for restaurants or other commercial cooking operations.

Appliances such as standard home gas stoves, while they utilize gas, are typically designed for residential use and do not meet the durability and capacity requirements of extra-heavy duty appliances. Similarly, electric heating elements can be used in various kitchen appliances, but they also tend to be tailored toward residential settings and hence do not classify as extra-heavy duty. Outdoor grills, depending on their design, can vary widely but typically focus on casual or recreational cooking rather than the demands of high-volume professional environments.

Thus, the classification of extra-heavy duty cooking appliances often favors those that employ open flame combustion due to their robust design, efficiency in high-demand conditions, and suitability for commercial use.