Propane Gas Use close temperature control and the latest heat transfer technology in this Opus 800 Fryer to create the best results with every cook. This unit immediately begins making its money back thanks to the integrated filtration system that begins filtering and reusing oil where it can, saving you the money and effort of buying barrels more frequently. This filtering system will operate while the oil is still hot and the fryer operational, ensuring that no loss is made through the machine needing to switch off or cool down during an oil change.