Empire small innsbrook Vent-Free gas fireplace insert is a desire to get the absolute best heating appliance you can get for your money. First of all, this versatile unit can be installed as a zero-clearance fireplace or as an insert in your existing fireplace. The realistic hand-painted ceramic fiber logs create a great look in the hearth while the extremely efficient Slope Glaze burner cranks out up to 20,000 BTU's. Includes: 3 Logs, Burner, Banded Brick Liner. Features: Model #: VFP20IN23LP. Simple, classic style. Fuel type: Liquid propane. Can be installed as a zero-clearance fireplace or as an insert in an existing fireplace. 99% efficient Slope Glaze Burner produces up to 20,000 BTUs. Built-in thermostat provides precise temperature control. BTU 20,000. Minimum Fireplace Opening Requirements:. Height - 18.5". Front Width - 26.75". Rear Width - 16.25". Depth - 13.75". Overall Dimensions: 40" (W) x 14.50" (D) x 25.75" (H). Required: Must Choose One Insert Surround to Complete This Unit (Not Included; Order Separately): Steel Surround, Contemporary, for 25,000-Btu Fireplace Insert, 6-inch top x 3-inch sides (S253BL). Steel Surround, Contemporary, for 25,000-Btu Fireplace Insert, 6-inch top x 6-inch sides (S256BL). Cast Iron Surround, Traditional, for 25,000-Btu Fireplace Insert, 6-inch top x 6-inch sides (SC256BL). Custom Surround 3-Sided, Black (CS3SIDED). Custom Surround 4-Sided, Black (CS4SIDED).