Interior racks keep food warm without further cooking. Most gas grills come with an igniter , either a knob or a push button. Battery-powered electronic igniters produce continuous sparks as long as the button is held down. Most grills have lighting holes on the side of or beneath the grill that can be used when the igniter fails. More burners can add more cooking flexibility.
Burners are typically steel.
A metal plate or metal bars, ceramic or charcoal-like briquettes , or lava rocks distribute heat and vaporize juices, flavoring the food. In our tests, we've found no particular material does a better job at ensuring even heating, but that grills that lack any heating medium at all typically cook less evenly. You can make food taste smoky by putting a pan of wet wood chips inside any grill. Most gas grills have a propane tank , sometimes with a fuel gauge . Most tanks sit on the base of the grill and attach to its gas line with a handwheel.