Silicone Rubber Drum Heater Current Rating 3.9 A Environment Indoor For Container Capacity 5 gal For Container Material Type Metal For Container Type Drums Thermostat Temperature -Maximum 425 Degrees F Thermostat Temperature -Minimum 50 Degrees F Operating Voltage 115V AC Watt Density 4.7 W/sq in Watts 550 W Closure Method Hook Clip Drum Diameter - Maximum 11 1/2 in Electrical Connection Type 3-Prong Plug