Maximum Heat Is Delivered By The Upper Tier Burner For More Rapid Boils And Hotter Sears. The Low Flame On The Lower Tier Burner Eliminates The Need For A Double Boiler Completely, And Keeps Even Delicate Sauces Warm Without Fear Of Scorching Or Separating. The Lower Tier Of The Wolf Dual-Stacked Burner Lets You Enjoy A Range Of Almost Unheard Of Precision Control. Melt Fine Chocolate Without Separation, Reduce Sauces Without Scorching, Or Keep Soups At An Ideal, Gentle Bubble For Hours. Maintain Control With Dual-Stacked BurnersMaintain Control With Dual-Stacked Burners That Go From 18,000 Btu Down To A Mere Breath Of Flame Simmer And Melt SaucesSimmer And Melt Sauces, Soups, And Marinades Easily With The Lower Tier Of The Dual-Stacked Burner Matches The Professional LookMatches The Professional Look Of Other Sub-Zero, Wolf, And Cove Products Reignites Flame AutomaticallyReignites Flame Automatically With Spark Ignition System Cleanup Is A Snap - Burner PansCleanup Is A Snap As Sealed, Seamless Burner Pans Contain Sloshes And Spills Move Pots And Pans - Cast IronMove Pots And Pans Effortlessly Across The Continuous Cast-Iron Grates Cooktop Specifications(Ul)(Li)3 - 9,200 Btu Burner(/Li)(Li)1 - 12,000 Btu Burner(/Li)(Li)1 - 18,000 Btu Burner(/Li)(/Ul)