Nearly all grill types incorporating the stainless steel structure are gas- or propane-fueled. Stainless steel resists rust and other types of corrosion that can result from harsh weather conditions. And the gas burners inside offer a quick grilling option without the messy cleanup of ash and char inherent in most charcoal-fueled grills.
Several grill manufacturers, including the iconic grill company Weber, incorporate porcelain coating on charcoal and gas grills alike. The classic kettle-style charcoal grill contains a porcelain enamel coating both inside and outside the grilling chamber that protects the core steel skeleton against rust and heat damage. Porcelain also is a good insulator, helping the grill retain more heat than standard steel structures.