Below is a list of Drum Heaters manufacturers from London, Ontario. Drum heaters are used to heat, melt and liquefy thick materials held in drums, tanks, canisters and other containers in order to reduce viscosity and make the substances more fluid. This particular process heating apparatus offers uniform warming to avoid scorching the contained materials such as tar, wax, grease, varnish, resin, galantine and even chocolate. Drums filled with these substances often come in standard sizes including 5 gallon, 15 gallon, 30 gallon, 55 gallon, 350 gallon and intermediate bulk containers.