Product Features # Heater and wall furnace rated # 30,000 BTU's in natural gas or propane and 86% steady state maximum efficiency # No electricity is required to light or operate - ensures reliable use even during power failures # Yellow Dancing FlameÃî burner system # 50% flame/heat adjustment for maximum comfort and efficiency # Compact, easily accessible and user-friendly controls # Equipped with 100% safety shut off feature for your peace of mind # Clear, 230 sq. inches of viewing area - 21" x 12 3/8" # Black trivet # Heat radiating, high temperature ceramic bay glass door available in 24 Karat gold plated or metallic black painted (ordered separately) # Ease of operation is added with an optional, convenient wall thermostat or an on/off auto temperature remote control # Built-in blower extracts maximum heat from the extra large heat exchanger. # President's Limited Lifetime Warranty # Direct vent model requires no chimney, it vents conveniently through a wall or roof and uses outside combustion air # Wall furnace rated # Approved for bathroom (direct vent only) bedroom, bed-sitting room and basement installations # Suitable for mobile home installation # Patented B-vent adapter kit conveniently modifies the direct vent stove into a conventional B-vent unit # The GDS28 is also approved with Simpson Dura-Vent, as well as Wolf Steel Venting Components # Installs safely on any floor, even carpet and vents up to 20 ft. horizontally and up to 40 ft. vertically Specification Type Specification Fuel Natural Gas or Propane Vent Type Direct Vent or B-Vent BTU Input Natural Gas 30,000 BTU Input Propane 26,000 BTU Output Natural Gas 25,500 BTU Output Propane 22,400 Maximum Heating Efficiency (Steady State) NG 85% Maximum Heating Efficiency (Steady State) LP 86% Maximum Heating Efficiency (AFUE) NG 76% Maximum Heating Efficiency (AFUE) LP 77% Tested to ANSI Z21.86, Z21.88 CSA 2.32 and CSA 2.33