15-25,000 BTU, Convection Style LP Heater, Projects Heat 360 Degrees, Matchless Piezo Ignition, No Electricity Required, Heats Approximately 600 SQFT, Operates Approximately 28 Hours On 20 LB Cylinder, Sold Separately, Perfect For Drywalling, Painting & Concrete Curing, Ideal For Professional & Do It Yourself Construction Projects.