Spmcgivern, the Rejuvenator Oven has a fan that circulates air and the oil is removed from the surface of the ball by pads that the ball sit on and rotate on during the process. Once the pads get oil soaked, you simply replace them.
Once the oil is brought to the surface for a given temperature, and wiped by the pad, the ball stops "sweating" and the process is complete. Whether using water or air, once all of the oil is removed from the ball, then that has to be the optimum obtainable condition.
Perhaps this water based system will be faster, but I see no other possible benefit, other than saving time.