Maximum BTU/Hr. - 68,242-(Hi), 44,357-(Lo) 661 CFM Output Kilowatts 20kW-Hi, 13kW-Lo Multiple Heat Setting 240V 50 / 33 A Three Phase ETL certified Weight 48 lbs. ETL Certified 1 Year Limited Warranty Two Stage Operation connects to a 100A or 50A breaker. 100A service provides high or low heat outputs. Burner coils are supported at both the top and bottom to reduce transport noise and provide extra support for increased coil life. Recessed controls provide durability for switches and knobs. Equipped with a 25°F-95°F thermostat. The heating element cycles on and off to maintain the set temperature. Designed and certified as an unattended source of jobsite heat. Fan only setting for circulating air on the jobsite.