In cases where high operating temperatures are required, diathermic oil systems are recommended compared to steam or superheated water systems, allowing the system to work with temperatures up to 350°C.
Other important features of the diathermic oil systems are guaranteeing they can constantly maintain the required temperatures, as well as safety (non-flammable and low explosion-risk fluid).
This is why diathermic oil is widely used, for example, in the petrochemical field.