The present invention is to heat the circulation of the heating medium heated by the heater in the greenhouse or barn while heating in a wet manner according to heat and steam to reduce energy consumption as well as to efficiently maintain the set temperature and humidity of the interior space of the facility, A heating body forming a vent on one surface； A heat source heater comprising a heating housing installed in the heating body and accommodating a heat medium therein, and a heater installed on the heating housing to heat the heat medium； A radiator installed in correspondence with the ventilation holes of the heating body and forming a moving path of the heating medium heated from the heat source heater, and radiating heat of the heating medium, and blowing air from the rear of the radiator, and radiating heat of the radiator to the ventilation opening. A heat source blower constituting a blowing fan to blow air through； Comprising a circulation pipe for connecting the heating housing of the heat source heater and the radiator of the heat source blower to form a circulation path of the heat medium, and a circulation pump installed on the circulation pipe and circulating the heat medium of the heating housing to the radiator A heat source circulator； And a heating controller installed on the heating body and controlling the heating temperature of the heater for heating the heat medium of the heat source heater by sensing after setting the heating temperature in the facility. The heat medium of the heat source heater includes 100 parts by weight of the heat medium. It provides an energy-saving wet heating system formed by mixing 70 to 80 parts by weight of glycerin and 20 to 30 parts by weight of water.본 발명은 온실이나 축사 내 히터에 의해 가열된 열매체의 순환으로 열교환하면서 열과 증기에 따른 습식방식으로 난방하여 에너지사용량을 절감함은 물론 시설 내부공간의 설정 온도 및 습도를 효율적으로 유지함을 제공하도록, 일면에 통풍구를 형성하는 난방본체와； 상기 난방본체 내 설치되고 내부에 열매체를 수용하는 가열하우징과, 상기 가열하우징 상에 설치되어 열매체를 가열하는 히터로 구성되는 열원가열기와； 상기 난방본체의 통풍구에 대응하여 설치되고 상기 열원가열기로부터 가열된 열
