Električni grelniki zračnih kanalov porabijo električno energijo kot energijo za pretvorbo električne energije v toplotno energijo z električnim grelnim elementom. The heating element of the air heater is a stainless steel heating tube, which is made by inserting electric heating wires into a seamless steel tube, filling the gap with magnesium oxide powder with good thermal conductivity and insulation, and shrinking the tube.