68,242-(Hi), 44,357-(Lo) Maximum BTU/Hr. 661 CFM Output 240V Single Phase 54 / 81 A Two Stage Operation connects to a 100A or 60A 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 protection 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. ETL Certified 1 Year Limited Warranty Weight 45 lbs.