A washer-drier machine for washing and drying the Laundry comprising: - a washing tank suitable to contain the washing lignid; - a basket suitable to accommodate the laundry and being pivotally supported within the washing tank; - a drying circuit (16, 17, 18, 19, 20, 21) with a suction unit (17, 18), a heat exchanger (19, 20) and a heating unit which communicate with each other by means of a drying duct, said drying circuit (16, 17, 18, 19, 20, 21) being suitable of delivering a drying air flow through said basket, - a control unit; and - level control means (24, 6, 7, 15) wherein the washing tank defines therein a condensation space suitable to contain a cooling water volume that forms a free water surface spaced away from the basket such as to be capable of cooling the drying air flow blowing from the basket within the washing tank and wherein during a drying step the control unit is configured such that said cooling a water volume is held in said condensation space and the level control means (24, 6, 7, 15): - arrange said cooling water volume such that said free water surface is left out of the basket bulk; - control the cooling water level such that, during the drying step, due to the formation of the condensate, the free water surface does not exceed a predetermined upper level arranged below the basket, characterized in that said level control means (24, 6, 7, 15) comprise timer means driving the drainage of at least a part of the cooling water volume and condensate, at preset time intervals. - a washing tank suitable to contain the washing lignid; - a basket suitable to accommodate the laundry and being pivotally supported within the washing tank; - a drying circuit (16, 17, 18, 19, 20, 21) with a suction unit (17, 18), a heat exchanger (19, 20) and a heating unit which communicate with each other by means of a drying duct, said drying circuit (16, 17, 18, 19, 20, 21) being suitable of delivering a drying air flow through said basket, - a control unit; and - level control means (24, 6, 7, 15) wherein the washing tank defines therein a condensation space suitable to contain a cooling water volume that forms a free water surface spaced away from the basket such as to be capable of cooling the drying air flow blowing from the basket within the washing tank and wherein during a drying step the control unit is configured such that said cooling a water volume is held in said condensation space and the level control means (24, 6, 7, 15): - arrange said cooling water volume such that said free water surface is left out of the basket bulk; - control the cooling water level such that, during the drying step, due to the formation of the condensate, the free water surface does not exceed a predetermined upper level arranged below the basket, characterized in that said level control means (24, 6, 7, 15) comprise timer means driving the drainage of at least a part of the cooling water volume and condensate, at preset time intervals. - arrange said cooling water volume such that said free water surface is left out of the basket bulk; - control the cooling water level such that, during the drying step, due to the formation of the condensate, the free water surface does not exceed a predetermined upper level arranged below the basket,