Thermal oil system comprising an oil supply circuit, which circuit includes an oil conveying means by means of which a supply stream of thermal oil that circulates in the oil supply circuit can be generated, and further comprising a processing device for processing the thermal oil circulating in the oil supply circuit, which processing device is connected in parallel to the oil supply circuit and has a separating device and a condensation device, • it being possible to supply the separating device of the processing device with a processing stream of thermal oil to be processed which processing stream is branched off from the supply stream, • it being possible to separate volatile constituents from the thermal oil of the processing stream by means of the separating device by converting the volatile constituents into the gaseous state and it being possible to liquefy gaseous volatile constituents of the thermal oil of the processing stream produced by the separating device by means of the condensation device of the processing device, • the separating device having a gas chamber for receiving gaseous volatile constituents of the thermal oil of the processing stream and • the gas chamber of the separating device being connected to a gas chamber of the condensation device via a connecting line, which gas chamber of the condensation device is comprised by the condensation device in addition to a condensation unit and a collecting container for liquefied volatile constituents of the thermal oil of the processing stream, characterized in that a vacuum pump designed as a jet pump is provided, the jet pump having a suction side at which the jet pump is joined to the gas chamber of the condensation device and can be connected to the gas chamber of the condensation device, the jet pump being able to produce a pump-generated decreased pressure in the gas chamber of the condensation device, which decreased pressure is reduced with respect to a pressure in the gas chamber of the separating device and due to which decreased pressure gaseous volatile constituents of the thermal oil of the processing stream can be conveyed from the gas chamber of the separating device into the condensation device via the connecting line between the gas chambers (14, 19) of the separating device and the condensation device, and in that thermal oil of the processing stream is provided as the motive medium of the jet pump and the jet pump has an inlet which opens toward the oil supply circuit for the thermal oil of the processing stream provided as the motive medium. • it being possible to supply the separating device of the processing device with a processing stream of thermal oil to be processed which processing stream is branched off from the supply stream, • it being possible to separate volatile constituents from the thermal oil of the processing stream by means of the separating device by converting the volatile constituents into the gaseous state and it being possible to liquefy gaseous volatile constituents of the thermal oil of the processing stream produced by the separating device by means of the condensation device of the processing device, • the separating device having a gas chamber for receiving gaseous volatile constituents of the thermal oil of the processing stream and • the gas chamber of the separating device being connected to a gas chamber of the condensation device via a connecting line, which gas chamber of the condensation device is comprised by the condensation device in addition to a condensation unit and a collecting container for liquefied volatile constituents of the thermal oil of the processing stream,