The present invention relates to a heat exchanger comprising: a first tank in which a heating medium is accommodated A heater for heating the heating medium contained in the first tank A first connection pipe through which the heating medium of the first tank is discharged A heat exchanger for radiating heat of the heat medium obtained through the first connection pipe A blower fan for discharging the heat radiated from the heat exchanger to the outside A second connection pipe through which the heat medium from which heat is radiated is discharged from the heat exchanger A circulation pump for circulating the heat medium in the first tank And a main body to which the first fan, the first tank, the heat exchanger, and the blowing fan are mounted. In more detail, the heating medium stored in the first tank is connected to the first connection pipe And the heat medium which has moved to the inside of the hub tube moves to the hub auxiliary tube through the through hole of the hub tube to radiate heat through the heat exchanger, The heat exchanger is circulated through the connecting pipe and the third connecting pipe to the first tank so that the heat radiated from the heat exchanger is discharged to the outside through the blowing fan so that the outside air is heated, The present invention relates to a heating method for a heating device installed.Therefore, the heating device in which the heat exchanger of the present invention is installed in parallel uses a heating medium, so it is not necessary to ventilate the room air, minimize the heat loss, quickly raise the room air, It is possible to install the heat exchanger in various positions according to the internal structure of the main body, and a plurality of heat exchangers are installed in a parallel structure and heat exchange is performed at the same time, thereby shortening the circulation time of the heat medium.본 발명은 열매체가 수용되는 제1탱크와 상기 제1탱크에 수용된 열매체를 가열하는 히터와 상기 제1탱크의 열매체가 출수되는 제1연결관과 상기 제1연결관을 통해 입수된 열매체의
