Method for manufacturing an electric heating apparatus (10, 100, 200, 300, 400) having an electric heating element (12, 12', 12", 112, 212, 312, 412) which is arranged, embedded in an electrically insulating material (16, 17, 115, 125, 215, 225, 315, 325, 415, 425), on the inside of a multi-piece tubular metal casing (11, 101, 201, 301, 401), wherein the electric heating apparatus (10, 100, 200, 300, 400) comprises, on the inside of the multi-piece tubular metal casing (11, 101, 201, 301, 401), - on at least one end, an unheated region in which, when the electric heating apparatus (10, 100, 200, 300, 400) is in operation, the current at least also flows through at least one connection wire (13, 113, 213, 313) and/or at least one connection sleeve and/or at least one connection bolt which is in electrical contact with the electric heating element (12, 12', 12", 112, 212, 312, 412), and further - a heated region in which, when the electric heating apparatus (10, 100, 200, 300, 400) is in operation, the current only flows through a section extending through the heated region of the electric heating element (12, 112, 212, 312, 412), wherein, in accordance with the method, - in a first method step, the heated region is produced in a first part (11.1, 111, 211, 311, 411) of the multi-piece tubular metal casing (11, 101, 201, 301, 401) and is compressed, - in a second method step, carried out independently of the first method step, at least one section of the unheated region is produced in a second part (11.2, 121, 221, 321, 421) of the multi-piece tubular metal casing (11, 101, 201, 301, 401), and the first part (11.1, 111, 211, 311, 411) and the second part (11.2, 121, 221, 321, 421) of the multi-piece tubular metal casing (11, 101, 201, 301, 401) are connected to each other, characterized in that, in the second method step, the second part (11.2, 121, 221, 321, 421) of the multi-piece tubular metal casing (11, 101, 201, 301, 401) is compressed, together with the components arranged therein, wherein the second compression is carried out such that, due to the resulting axial pressing force, an almost homogenous transition region is formed between the electrically insulating material (16, 115, 215, 315, 415) in the regions which were subject to the compression in the first method step and the electrically insulating material (17, 125, 225, 325, 425) in the regions which were subject to the compression in the second method step. - on at least one end, an unheated region in which, when the electric heating apparatus (10, 100, 200, 300, 400) is in operation, the current at least also flows through at least one connection wire (13, 113, 213, 313) and/or at least one connection sleeve and/or at least one connection bolt which is in electrical contact with the electric heating element (12, 12', 12", 112, 212, 312, 412), and further - a heated region in which, when the electric heating apparatus (10, 100, 200, 300, 400) is in operation, the current only flows through a section extending through the heated region of the electric heating element (12, 112, 212, 312, 412), wherein, in accordance with the method, - in a first method step, the heated region is produced in a first part (11.1, 111, 211, 311, 411) of the multi-piece tubular metal casing (11, 101, 201, 301, 401) and is compressed, - in a second method step, carried out independently of the first method step, at least one section of the unheated region is produced in a second part (11.2, 121, 221, 321, 421) of the multi-piece tubular metal casing (11, 101, 201, 301, 401), and the first part (11.1, 111, 211, 311, 411) and the second part (11.2, 121, 221, 321, 421) of the multi-piece tubular metal casing (11, 101, 201, 301, 401) are connected to each other,