Drum heaters are used to heat containers of viscous materials. They can be wrapped around or placed inside containers that hold substances such as wax or grease. Drum heaters are used on drums or process materials in a number of ways. Some of the most common methods include cabinet heating, insertion heating, tunnel heating, and wrap around heaters. Cabinet heaters can heat either drums or containers depending on capacity.  The drums or containers are loaded into the cabinet by forklift and after processing removed the same way.  Insertion heaters are designed to fit through standard drum bung.  Tunnel drum heaters convey drums or containers into the oven. They are processed and conveyed out the other end when warmed to the proper temperature.  Wrap around heaters are sized to wrap around standard industrial drums sizes.