The Superior unique, clean burning design provides 99% heating efficiency, allowing you to operate the logs vent-free with the fireplace damper closed. With no venting required, there is no heat loss up the chimney. Plus heating with Superior gas logs means you'll never again be left in the cold with wet logs or without heat during a power outage. Variable Remote and Electronic models include a remote control built-in thermostat and adjustable flame height settings. Includes Embers Features Model # BGE18NE. Rating Variable 21,000/30,000 Btu/Hr. Ignition Electronic. Gas Type Natural Gas. BURNER ONLY Glow Ramp Electronic Burner. Manifold Pressure 4.5 W.C. Inlet Gas Pressure in. of water Max 10.5 W.C., Min 5 W.C. For use with Fiber Log Set LBG18-SM and Concrete Log Set LBG18-BM by Superior Fireplaces. Specifications Size 18 . Log Set is shown in image, however not included in this product.