DESC: Sealed burners are built into a glass-ceramic surface for a smooth, sophisticated look.15,000 BTU ultra-high output burner brings water to a boil quickly.Low output burner reduces to 900 BTU for keeping delicate sauces warm.Downdraft ventilation keeps the kitchen fresh and odor-free, no matter what you're cooking.Electronic ignition with Flame-Sensing™ reignition ensure burners light reliably and relight automatically if they are accidentally blown out.Porcelain-on-cast iron burner grates with gloss finish are durable and stylish.