Drum Immersion Direct Heating method is applied for those media that can come in direct contact with healing instrument. Immersion heater used for this heating procedure is used for direct heating of viscous fluid, solvent, oil, gases and water. Fast and reliable heating process is one of the main aspects of Drum Immersion Direct Heating method. Besides saving heating duration, direct heating process by immersion heater proves to be advantageous for saving electricity bill. Drum immersion heating method ensures even distribution of heat across handled media without affecting their quality.