Most drum heaters do not offer compatibility of use with flammable liquid in hazardous areas, but these heaters are designed for use in Class I hazardous areas. You have two choices of heaters, one to be used in T3 area and the other in T4.
Before continuing to the heater specification itself, let’s confirm the hazardous areas in question first. According to Wikipedia, Class I, Division 2 area is a condition where ignitable concentrations of gases, liquids or vapors might be present under abnormal operation. T3 and T4 are terms to describe hazardous areas based on the temperature in the atmosphere. This is especially important when electrical appliances are used, like the drum heaters. T3 area is a hazardous area where 200°C (392°F) temperature can cause flame. T4 exposes temperature up to 135°C (275°F). Any electrical equipment placed and utilized within these T3 and T4 areas should not have its surface reach temperature more than 80% of the temp indicated above.
The hazardous area drum heaters offered here are suitable to use in Class I, Div 2 areas. The T3 drum heater and the T4 drum heater heat your flammable contents safely, thanks to the quality silicone rubber and fiberglass material encasing the heater. They are also moisture proof and long lasting equipped with simple spring and hook fastener to install and remove easily. The smart heater stops heating when reaching 80% of the T rating temperature, suiting the National Electrical Code Article 501.
Other technical specs that come with these hazardous area drum heaters include thermostat assembly with its 10’ cord and NEMA 5-15 plug, ideal operation on 120 volts AC and 240 volts AC at 1300 watts. These heaters are perfect for 55 gallon steel drums, but you can also order for 30 gallon steel drums. Please specify whether you will use the heaters in T3 or T4 areas.