Blaze B500 Freestanding Wood Heater Heating Coverage – 160-190 Sq.M Emissions – 0.71g/kg. Efficiency – 73% Peak 8mm Steel Baffle. 6mm Firebox Lining. Sturdy steel door with large ceramic glass Stay cool SS spring door handle Firebrick lined to increase thermal mass Note: images are indicative only. All details subject to change.