Porcelain-enameled, Cast-iron Cooking Grates Provide Superior Heat Retention. The Fuel Gauge Lets You See How Much Fuel Is Left In the Tank (lp Only)igrill 3 Compatible, For Perfectly Grilled Food (accessory Sold Separately). An Exclusive World-class Grilling Engine, Three Powerful Burners & I Grill 3 Smart Technology Compatibility. This is the New Standard in Gas Grilling. This Genesis Grill Features Weber’s Gs4 Grilling System. The Gs4 High Performance Grilling System Sets the Standard in the World Of Gas Grilling, & Lands Weber in a Class of Its Own. This Powerful Grilling System is Based on over 65 Years of Grilling Experience, Culinary Expertise, & Most Importantly, the Wants & Needs of the People who matter Most. Each Component of Gs4 was Uniquely Designed for Ease-of-use & to provide an unequaled satisfaction to your Backyard Grilling Experience.