Closed Pressurized System Large Fuel Capacity Large Firedoor for Easy Solid Fuel Loading Choice of Wood or Coal Grates Convenient Ash Removal Solid Fuel and Oil are Automatically Controlled to maintain Water Temperature Quiet Efficient Flame Retention Oil Burner Attractive "Warm Red" Cabinet 5-Year "Limited Warranty" 1/4" Steel Plate Construction Water Filled Tubes Extend Heating Surface ASME Pressure Relief Valve Fusible Plug for Safety Coal Units with Extra Heavy Cast Iron Shaker Grates Wood Units with Extra Heavy Cast Iron Tubular Grates American Made