Abstract: A device for the evaporation of volatile substances, in particular of insecticides and/or aromatics, is disclosed having a housing containing a heating element, with a container for the volatile substance disposed in the housing, a wick which can be heated by the heating element, and a heating block having a wick end protruding from the container along a wick axis. The improved device includes at least one additional wick opening formed within the heating block; at least one additional container for containing an additional volatile substance for evaporation, and the additional wick opening being operatively associated with the additional container. At least one additional wick is carried in the additional container, having a wick end extending through the additional wick opening for evaporation of the additional volatile substance in the additional container.