Cartridge (100, 100')/heating receptacle (200, 200') assembly for melting a hydrocarbon binder, the cartridge (100, 100') being intended to contain the hydrocarbon binder, said cartridge (100, 100') being configured to be inserted inside the heating receptacle (200, 200'), said cartridge (100, 100') comprising a lower wall (101, 101'), an upper wall (102, 102'), and at least one side wall (103, 103') forming the connection between the lower (101, 101') and upper (102, 102') walls, said cartridge (100, 100') having within it at least one heating tube (104a, 104b, 104'), the ends of which are fixed to at least one side wall (103, 103'), the heating receptacle (200, 200') being configured to receive within it the cartridge (100, 100') and having a base (201, 201'), at least one side partition (203, 203') configured to surround the cartridge (100, 100'), and a heating device (211, 211') disposed at the base (201, 201'), characterized in that said heating receptacle (200, 200') also has within it at least two separating partitions (220a, 220b, 220a', 220b') disposed one above the other and projecting inward from its at least one side partition (203, 203'), said separating partitions (220a, 220b, 220a', 220b') being configured to come into contact with the side wall (103, 103') of the cartridge (100, 100') and encircle the cartridge (100, 100') so as to define at least two air circulation spaces (A, A', B, B', C') which are connected by the at least one heating tube when the cartridge is in place, the spaces then communicating with one another to form a path in which the fumes and the air can circulate, the lower wall (101, 101') of the cartridge (100, 100') having a surface area smaller than that of the upper wall (102, 102'), such that the side walls (103, 103') have a clearance angle of between 90 and 85°, preferably 87.5°. the cartridge (100, 100') being intended to contain the hydrocarbon binder, said cartridge (100, 100') being configured to be inserted inside the heating receptacle (200, 200'), said cartridge (100, 100') comprising a lower wall (101, 101'), an upper wall (102, 102'), and at least one side wall (103, 103') forming the connection between the lower (101, 101') and upper (102, 102') walls, said cartridge (100, 100') having within it at least one heating tube (104a, 104b, 104'), the ends of which are fixed to at least one side wall (103, 103'), the heating receptacle (200, 200') being configured to receive within it the cartridge (100, 100') and having a base (201, 201'), at least one side partition (203, 203') configured to surround the cartridge (100, 100'), and a heating device (211, 211') disposed at the base (201, 201'), characterized in that said heating receptacle (200, 200') also has within it at least two separating partitions (220a, 220b, 220a', 220b') disposed one above the other and projecting inward from its at least one side partition (203, 203'), said separating partitions (220a, 220b, 220a', 220b') being configured to come into contact with the side wall (103, 103') of the cartridge (100, 100') and encircle the cartridge (100, 100') so as to define at least two air circulation spaces (A, A', B, B', C') which are connected by the at least one heating tube when the cartridge is in place, the spaces then communicating with one another to form a path in which the fumes and the air can circulate, the lower wall (101, 101') of the cartridge (100, 100') having a surface area smaller than that of the upper wall (102, 102'), such that the side walls (103, 103') have a clearance angle of between 90 and 85°, preferably 87.5°.