The liquid in the entire system of the heating cycle (with water cooling) is in a fully enclosed circulation, and the circulation system is equipped with a liquid expansion container. The expansion container and the liquid circulation are independent systems, and the expansion container does not participate in the liquid circulation, but is only mechanically connected. Even under high temperature operation, the thermal conductivity medium in the expansion container will not exceed 60 degrees. The heating cycler (high-temperature cycler) designed and produced by our company is a fully enclosed liquid circulation system that does not produce oil mist at high temperatures. The heat transfer oil does not come into contact with air, thus preventing oxidation and browning of the heat transfer oil and extending its service life.