Abstract: A heating device for heating a powder during the production of a 3D shaped part. The heating device has an infrared (IR) lamp and a housing in which a construction chamber is provided. The construction chamber is bounded at the bottom by a construction platform for receiving the shaped part and is supported on a support plate. The IR lamp heats the powder during production of the 3D shaped part in the construction chamber. For ensuring an optimized heat transfer to the sintering or melting powder with a particularly homogeneous temperature distribution, a partition wall composed of an IR radiation transparent material is arranged between the construction chamber and the IR lamp.