Prevent freezing, control viscosity, or melt and maintain materials at elevated temperatures with the BH THERMAL BriskHeat Indoor/Outdoor Drum Heater. Easy installation with wraparound and spring fastener. Encapsulated thermostatic controller has adjustable setting. Standard (01) 3" wide grounded drum heaters heat steel drums quickly. Heavy-duty 4" wide drum heaters (02) have nickel-iron heating elements insulated with fiberglass and laminated between two layers of silicone rubber-impregnated fiberglass cloth with dense grounding grids. 120-volt units have a 6' power cord and plug; 240-volt units do not include a plug. 18-month warranty. C/UL Approved. For explosion-proof heaters, call for more information. Made in USA.