 Drum heaters are available for drums between 20 and 220 litres.Drum ovens are designed to store and heat typically from four to 24 drums, usually stored in groups of four on pallets, for ease of insertion and removal by fork-lift.Heated by steam or radiant electric elements, with a single zone thermostat, they are commonly used where long-term storage at a fixed temperature is required to reduce liquid viscosity or keep solids above their melt temperature.