This adds heat medium in a closed independent circulation heating system. The inner cavity of the radiator is an independent and closed circulation system. Inject water into it first. When the water flows in the heating system, the heated high-temperature gas will heat the surrounding air and objects with lower temperature, and the temperature of the water inside will also decrease accordingly. Then as the water circulates, the low-temperature water will return to the heat source and be further heated, so that repeated work can achieve the purpose of heating the room.