Super HDLegendary performance for serious wood burners. The Super 27HD is based on our industry leading Super LE wood stove and features a heavy duty steel top, collar, and ash dump system standard. Combined with a 5 15 year warranty, this wood stove is the benchmark for heavy duty wood burners. TECHNICAL INFORMATION 72,000 BTU Cord Wood 38,200 BTU EPA Test Fuel Efficiency (HHV) 71. 3% Emissions 1. 8 gm hr. Log Size (recommended) 16 Log Size (max) 18 Firebox