Laundry dryer comprising: a laundry storing compartment for receiving laundry to be treated and including a circumferential wall defined by a rotatable drum and a compartment back wall, a front wall with a front loading opening for loading laundry into the laundry storing compartment, wherein the compartment back wall is opposite to the loading opening, a rear frame including said compartment back wall, a rear wall forming at least a portion of a back cover of the dryer, a steam generation unit for generating steam for laundry steam treatment, and a nozzle unit comprising one or a plurality of nozzle outlets for injecting steam generated in the steam generation unit into the laundry storing compartment, and a drain outlet for draining water from within the nozzle unit to the outside, wherein the laundry dryer comprises a rear channel (20b, 20c) for guiding process air at the backside of the laundry storing compartment to the laundry storing compartment, the compartment back wall comprises a plurality of back wall openings designed for passing process air from the rear channel (20b, 20c) into the laundry storing compartment, the laundry dryer being characterized in that the nozzle outlet of the nozzle unit is arranged between said compartment back wall and said rear wall inside said rear channel (20b, 20c) so that steam ejected from the nozzle outlet passes through at least one back wall opening of the compartment back wall before entering the laundry storing compartment, and the drain outlet is for draining the water from the nozzle unit to the rear channel (20b, 20c). a laundry storing compartment for receiving laundry to be treated and including a circumferential wall defined by a rotatable drum and a compartment back wall, a front wall with a front loading opening for loading laundry into the laundry storing compartment, wherein the compartment back wall is opposite to the loading opening, a rear frame including said compartment back wall, a rear wall forming at least a portion of a back cover of the dryer, a steam generation unit for generating steam for laundry steam treatment, and a nozzle unit comprising one or a plurality of nozzle outlets for injecting steam generated in the steam generation unit into the laundry storing compartment, and a drain outlet for draining water from within the nozzle unit to the outside, wherein the laundry dryer comprises a rear channel (20b, 20c) for guiding process air at the backside of the laundry storing compartment to the laundry storing compartment, the compartment back wall comprises a plurality of back wall openings designed for passing process air from the rear channel (20b, 20c) into the laundry storing compartment, the laundry dryer being characterized in that the nozzle outlet of the nozzle unit is arranged between said compartment back wall and said rear wall inside said rear channel (20b, 20c) so that steam ejected from the nozzle outlet passes through at least one back wall opening of the compartment back wall before entering the laundry storing compartment, and the drain outlet is for draining the water from the nozzle unit to the rear channel (20b, 20c). one or a plurality of nozzle outlets for injecting steam generated in the steam generation unit into the laundry storing compartment, and a drain outlet for draining water from within the nozzle unit to the outside, wherein the laundry dryer comprises a rear channel (20b, 20c) for guiding process air at the backside of the laundry storing compartment to the laundry storing compartment, the compartment back wall comprises a plurality of back wall openings designed for passing process air from the rear channel (20b, 20c) into the laundry storing compartment, the laundry dryer being characterized in that the nozzle outlet of the nozzle unit is arranged between said compartment back wall and said rear wall inside said rear channel (20b, 20c) so that steam ejected from the nozzle outlet passes through at least one back wall opening of the compartment back wall before entering the laundry storing compartment, and the drain outlet is for draining the water from the nozzle unit to the rear channel (20b, 20c).