Enjoy a wide landscape view of the most realistic log and glowing ember-bed Regency currently has to offer with the U1500E Ultimate Gas fireplace. The Ultimate series features a seamless design, coastal driftwood logs set on a glowing linear ember-bed and beautiful wide angle flames set in front of reflective back enamel panels emphasize the fire. Features: Clean contemporary lines Ceramic burner with glowing linear ember-bed and logs Electronic Ignition Natural Gas or Propane Specifications (Natural Gas): Maximum BTU: 43,000 Turn Down BTU: 29,000 Optimum Efficiency: 73.72% EnerGuide Rating: 67.46% Specifications (Propane - conversion kit required): Maximum BTU: 42,000 Turn Down BTU: 33,500 Optimum Efficiency: 74.67% EnerGuide Rating: 69.64% General Specifications: Viewing Area: 611 sq.in. Vent Type: Direct Vent Vent Size (Air Intake): 8"" Vent Size (Exhaust): 4" Dimensions (Clean Edge only): Height: 16 3/16" Width (Front): 48" Depth: 12 3/4" Documents: Brochure: Link Installation Manual: Link Spec Sheet: Link