Device for releasing an aerosol, comprising: a cylindrical upper housing with a cylindrical top protrusion extending downwards from a top wall so that a predetermined space is formed between a circumferential inner side of the upper housing and an outer side of the cylindrical top protrusion, wherein the top protrusion comprises a bolt protruding downwards from the bottom end of the top protrusion, and wherein the upper housing comprises at least one opening for releasing the dispersed aerosol; a cylindrical lower housing with a bottom floor, further including a bottom opening in the bottom floor of the lower housing; a cylindrical bottom protrusion enclosing the bottom opening and protruding upwards so that a predetermined space is provided between an inner side of the lower housing and an outer side of the cylindrical bottom protrusion forming a reservoir for the aerosol; a support frame fixedly connected to the inner side of the bottom floor and/or the side of the lower housing; and a float that covers the cylindrical bottom protrusion, wherein the inner circumferential shape of the float matches the outer shape of the cylindrical bottom protrusion and wherein the float is supported by the support frame so that the distance C between the bottom protrusion and the float is essentially the same over the whole circumference, wherein an upper portion of the bottom protrusion and an upper portion of the float are tapered, characterized in that the distance T of the top end of the cylindrical bottom protrusion to the inner side of the top end of the float is greater than the respective circumferential distance C. a cylindrical upper housing with a cylindrical top protrusion extending downwards from a top wall so that a predetermined space is formed between a circumferential inner side of the upper housing and an outer side of the cylindrical top protrusion, wherein the top protrusion comprises a bolt protruding downwards from the bottom end of the top protrusion, and wherein the upper housing comprises at least one opening for releasing the dispersed aerosol; a cylindrical top protrusion extending downwards from a top wall so that a predetermined space is formed between a circumferential inner side of the upper housing and an outer side of the cylindrical top protrusion, wherein the top protrusion comprises a bolt protruding downwards from the bottom end of the top protrusion, and wherein the upper housing comprises at least one opening for releasing the dispersed aerosol; a cylindrical lower housing with a bottom floor, further including a bottom opening in the bottom floor of the lower housing; a cylindrical bottom protrusion enclosing the bottom opening and protruding upwards so that a predetermined space is provided between an inner side of the lower housing and an outer side of the cylindrical bottom protrusion forming a reservoir for the aerosol; a support frame fixedly connected to the inner side of the bottom floor and/or the side of the lower housing; and a float that covers the cylindrical bottom protrusion, wherein the inner circumferential shape of the float matches the outer shape of the cylindrical bottom protrusion and wherein the float is supported by the support frame so that the distance C between the bottom protrusion and the float is essentially the same over the whole circumference, wherein an upper portion of the bottom protrusion and an upper portion of the float are tapered, a bottom opening in the bottom floor of the lower housing; a cylindrical bottom protrusion enclosing the bottom opening and protruding upwards so that a predetermined space is provided between an inner side of the lower housing and an outer side of the cylindrical bottom protrusion forming a reservoir for the aerosol; a support frame fixedly connected to the inner side of the bottom floor and/or the side of the lower housing; and a float that covers the cylindrical bottom protrusion, wherein the inner circumferential shape of the float matches the outer shape of the cylindrical bottom protrusion and wherein the float is supported by the support frame so that the distance C between the bottom protrusion and the float is essentially the same over the whole circumference, wherein an upper portion of the bottom protrusion and an upper portion of the float are tapered, characterized in that the distance T of the top end of the cylindrical bottom protrusion to the inner side of the top end of the float is greater than the respective circumferential distance C.