The GE 30 in. Built-In Gas Cooktop features 4 all-purpose burners that can deliver a wide range of heat outputs and so are ideal for most cooking requirements. The precise simmer burner has a low setting of 140 degrees Fahrenheit which is ideal for delicate foods and sauces. The burner grates are made of cast iron to provide durability and reliability, while the dishwasher-safe knobs enable easy cleaning and maintenance. The recessed surface and the sealed cooktop burners both help to contain spills.