Patent ID: 7977606

Claim:
A heat-transfer-medium heating apparatus comprising: a PTC heater having a stacked construction in which an electrode plate, an incompressible insulating layer, and a compressible heat-conducting layer are sequentially provided on each surface of a PTC element so as to sandwich the PTC element; and heat-transfer-medium circulating boxes, respectively disposed in close contact with the two surfaces of the PTC heater and having circulating channels for the heat-transfer-medium formed therein, wherein the heat transfer medium circulating inside the heat-transfer-medium circulating boxes is heated by radiant heat from the two surfaces of the PTC heater, a board accommodating box is provided on the surface of one of the heat-transfer-medium circulating boxes, at the opposite side from the surface contacting the PTC heater, and a control board configured to control the PTC heater is accommodated inside the board accommodating box, and heat-generating components provided on a lower surface of the control board are disposed on an upper surface of a cooling portion provided on the bottom surface of the board accommodating box via an insulating layer, the heat-generating components are disposed in the vicinity of an inlet in the heat-transfer-medium circulating channel in the heat-transfer-medium circulating box.