This Portable Propane Construction Heater can heat up to 4,100 Square Feet or an area 50’ x 82’ x 8’.It has a high output blower that circulates heat quickly with a push button matchless ignition for easy starting.A great construction heater for the price with 175k BTU's and a high capacity fan that distributes heat quickly and evenly. This Product Is Proudly Assembled in the USA Using Parts Manufactured in the USA! Designed, Engineered, Assembled and Tested in the USA. Skilled American workers manufacture parts, assemble and test our products. Only high-quality materials and parts are used in the manufacturing of our products. Our factory features state of the art manufacturing equipment. Product ships from our domestic warehouse in Kentucky, USA. Product Features: Heats Up To 4,100 Square Feet or an area 50’ x 82’ x 8’ Patented Variable Heat Control Runs Approx. 34 Hours on Two (2) 100 lb. Propane Cylinder Operates on 60/100 & (2) 100 lb. threaded refillable gas propane cylinders Quiet Atmospheric Burner Ergonomical/Stackable Design Rugged Roll Cage Design Top Mount Controls< Dependable Motor, Starts Reliably In Cold Weather Engineered For Dependability Adjustable Height Stand Automatic Safety Shut-Off 10 ft. hose and regulator included Cool Touch Shell Temperatures Large Handle - Easy To Use Even With Gloves 120 Volt/ 60 Hz Operation Product Dimensions: 26” L x 13” W x 19” H Product Weight (Without Propane Tank): 25.5 lbs. CSA Certified 1 Year Limited Warranty Please Note: This Item Is Not for Sale To Residents In California. Check your local regulations before purchasing and installation. Click Here to view state by state code acceptances for vent-free gas appliances. Vent-Free heaters do not operate at elevations above 4,500 feet altitude. WARNING Click Here for detailed information on Prop 65. BP175VRC Owner's Manual