A gas cooking appliance for use with at least one removable burner, the cooking appliance including a structural housing supporting a cooktop surface having at least one convertible area for use with the at least one removable burner. When the at least one removable burner is operable with the cooking appliance, it resides above the convertible area and is supplied a fuel mixture from the cooking appliance by a gas-to-air type fuel supplier. According to various preferred embodiments there are provided a gas shutoff device for stopping the flow of gaseous fuel to the removable gas burner when the burner is relocated or not properly installed to the appliance proper; and an interlock so that during cooking, the removable burner does not move about in an unsafe way.