Some companies that manufacture drum heater kits for 55-gallon drums are U.S. Stove and Vogelzang. Customers can purchase kits like these at stores such as The Home Depot and NorthlineExpress.com.
The kit from U.S. Stove is made of cast iron and comes with a door, legs and flue collar with a damper, but does not come with the barrel. It also comes with all mounting hardware for easy assembly. The kit is ideal for turning a steel barrel into a heater for camping, hunting and fishing trips, but it is not meant for residential use.
The kit from Vogelzang is for use in residential homes, except for mobile homes, manufactured homes and trailers. Customers must also provide their own drum for use with the kit. The kit itself is made of cast iron and features a gasketed ash cleanout door and a cam-lock door latch that is cool to the touch.