The Luxury Direct Vent Fireplace from Tahoe generates incredibly natural-looking flames, thanks to a specially-designed 35,000 BTU burner and realistic thirteen-piece log set. This Direct Vent Natural Gas fireplace has a maximum steady state efficiency of 85%--that means it'll keep you and your family warm without running up your heating bill. Its Slope Glaze Excess burner generates up to 35,000 BTUs of heat, ensuring that your home will be nice and toasty during the winter.Conventional louvers (Accepts Decorative Louvers) Heater Rated up to 85% Steady State Efficiency RF Variable Flame and Blower (LP or Nat) 13-pc Log Set Slope Glaze Excess Burner Millivolt Standing Pilot Piezo Blower Dimmer LightAir Shutter Opening (LP): Full open Air Shutter Opening (N): 1 4 BTU (LP): 21,000-30,000 BTU (N): 24,000-35,000 Depth: 19-7 8 Fuel Types: Liquid Propane, Natural Gas Gas Inlet Shutoff Valve (Pipe): 1 2 NPT Height without standoff: 34-3 4 Ignition Types: Millivolt KWH (LP): 6.2-8.8 KWH (N): 7.2-10.3 Width: 39-3 8Consult your local building code agency, prior to installation, to ensure compliance with local codes-including permits and inspections.