Nozzle arrangement for an edge strip application device for acting on an edge strip or workpiece which is adhesive-free, thermally activatable or coated with hot melt adhesive with a heat medium, in particular with hot air, comprising a nozzle body having - at least one air inlet region which is connected to a heat medium supply pipe so that a heat medium which is under pressure, in particular hot air, can be supplied to the nozzle body during operation of the edge strip application device, - at least two groups (4a, 4b) of air outlet openings, wherein the air outlet openings are constructed at a front side of the nozzle body facing the edge strip with spacing from each other in a vertical direction perpendicular to a feed direction of the edge strip and are in flow connection with the at least one air inlet region so that the at least two groups (4a, 4b) of air outlet openings are spaced apart from each other in the feed direction of the edge strip and the heat medium which is supplied to the nozzle body can flow out of the air outlet openings and can act on a thermally activatable functional layer of the edge strip, - a number of closure members (6a, 6b) which corresponds to the number of groups (4a, 4b) of air outlet openings at the front side, which closure members are constructed in such a manner that at least some of the air outlet openings can be selectively opened or closed so that the outflow of the heat medium can be adapted to different widths of the supplied edge strip, characterised in that within the nozzle body there is arranged at least one heating element (9a, 9b, 9c) by means of which the nozzle body can be heated, and/or in that within the heat medium supply pipe there is arranged at least one heating element by means of which the heat medium supply pipe can be at least partially heated. - at least one air inlet region which is connected to a heat medium supply pipe so that a heat medium which is under pressure, in particular hot air, can be supplied to the nozzle body during operation of the edge strip application device, - at least two groups (4a, 4b) of air outlet openings, wherein the air outlet openings are constructed at a front side of the nozzle body facing the edge strip with spacing from each other in a vertical direction perpendicular to a feed direction of the edge strip and are in flow connection with the at least one air inlet region so that the at least two groups (4a, 4b) of air outlet openings are spaced apart from each other in the feed direction of the edge strip and the heat medium which is supplied to the nozzle body can flow out of the air outlet openings and can act on a thermally activatable functional layer of the edge strip, - a number of closure members (6a, 6b) which corresponds to the number of groups (4a, 4b) of air outlet openings at the front side, which closure members are constructed in such a manner that at least some of the air outlet openings can be selectively opened or closed so that the outflow of the heat medium can be adapted to different widths of the supplied edge strip, characterised in that within the nozzle body there is arranged at least one heating element (9a, 9b, 9c) by means of which the nozzle body can be heated, and/or in that within the heat medium supply pipe there is arranged at least one heating element by means of which the heat medium supply pipe can be at least partially heated.