Our popular Slope Glaze Burners raise the standard for dancing flames. Internal ceramic beads tumble the gas to create exceptionally realistic flame movement. The Birch ventless gas logs are made of burncrete. The 18, 24 and 30-inch Vent-Free Burners are rated up to 38,000 BTU. This unit comes standard with a Variable Flame Remote burner. Other ignition options are available such as, Millivolt, Manual and Intermittent Pilot. Please call for pricing on those.