The subject matter discloses a water dispenser apparatus, comprising a single suction unit for pumping water from a water container to a cold water tank and to a hot water tank. The single suction unit also pumps water from a suction tube connected to either the cold water tank or the hot water tank. The water sucked by the suction unit from the suction tube is circulated between the cold water tank and the hot water tank and when heated is used to clean tubes and tanks at the water dispenser apparatus and is transferred through tubes within the water dispenser apparatus. The subject matter also discloses a method for cleaning the water dispensing apparatus by activating a primary cleaning cycle and a secondary cleaning cycle for cleaning the water tanks and the tubes.