Internal Ceramic Beads - Tumbles gas to create a dancing flame every time Variable Flame Remote Control - For convenient control over your flame For Use with - Empire "LS" log sets of the same size Burner Size - 18-Inch; Fuel Type - Natural Gas The White Mountain Hearth VFSV18NAT 18-Inch Ventless Slope Glaze Burner with Variable Flame Remote Control, Natural Gas, raises the standard for flame presence while integrated ceramic beads tumble the gas to form an ultra-realistic fire. The Vent-Free Slope Glaze Burner can reach up to 38,000 BTU while the Variable Flame Remote Control allows more convenient control over your flame presence. This burner requires an Empire LS log set in a matching size for optimal fireplace performance. Empire's focus on high quality construction and performance ensures a burner system that you will be able to enjoy for years to come.