A laundry treating apparatus comprising: a dryer including: a first cabinet ; and a first drum rotatably disposed in the first cabinet ; a washing machine including: a second cabinet arranged vertically with respect to the first cabinet ; a tub disposed in the second cabinet ; and a second drum rotatably disposed in the tub ; wherein the laundry treating apparatus comprises: a refresher including a third cabinet disposed at a lateral side of the first cabinet and the second cabinet , the refresher comprising an inner space for receiving laundry; a heating device disposed under the tub , the heating device configured to heat air supplied into the first drum and the inner space of the third cabinet , characterized by the heating device including a heat exchanger unit ; a drain pan for storing condensate, the drain pan disposed under the heat exchange unit ; and a drain pump configured to discharge water in the tub and the condensate in the drain pan , wherein the drain pump is disposed below the tub and in the heating device . a first cabinet ; and a first drum rotatably disposed in the first cabinet ; a washing machine including: a second cabinet arranged vertically with respect to the first cabinet ; a tub disposed in the second cabinet ; and a second drum rotatably disposed in the tub ; wherein the laundry treating apparatus comprises: a refresher including a third cabinet disposed at a lateral side of the first cabinet and the second cabinet , the refresher comprising an inner space for receiving laundry; a heating device disposed under the tub , the heating device configured to heat air supplied into the first drum and the inner space of the third cabinet , characterized by the heating device including a heat exchanger unit ; a drain pan for storing condensate, the drain pan disposed under the heat exchange unit ; and a drain pump configured to discharge water in the tub and the condensate in the drain pan , wherein the drain pump is disposed below the tub and in the heating device . a second cabinet arranged vertically with respect to the first cabinet ; a tub disposed in the second cabinet ; and a second drum rotatably disposed in the tub ; wherein the laundry treating apparatus comprises: a refresher including a third cabinet disposed at a lateral side of the first cabinet and the second cabinet , the refresher comprising an inner space for receiving laundry; a heating device disposed under the tub , the heating device configured to heat air supplied into the first drum and the inner space of the third cabinet , characterized by the heating device including a heat exchanger unit ; a drain pan for storing condensate, the drain pan disposed under the heat exchange unit ; and a drain pump configured to discharge water in the tub and the condensate in the drain pan , wherein the drain pump is disposed below the tub and in the heating device . a refresher including a third cabinet disposed at a lateral side of the first cabinet and the second cabinet , the refresher comprising an inner space for receiving laundry; a heating device disposed under the tub , the heating device configured to heat air supplied into the first drum and the inner space of the third cabinet , characterized by the heating device including a heat exchanger unit ; a drain pan for storing condensate, the drain pan disposed under the heat exchange unit ; and a drain pump configured to discharge water in the tub and the condensate in the drain pan , wherein the drain pump is disposed below the tub and in the heating device . <EOS>