A heat pump for a dishwasher includes a pump casing, a motor (20) having a rotatable shaft 201 extended into a chamber of the pump casing, an impeller (30) disposed within the chamber, a heating assembly (40) and a pressure switch assembly (50). The heating assembly includes a heating pipe (41) disposed in the chamber, a fuse (42), and a heater wire disposed in the heating pipe. The heating pipe includes an arc-shaped portion (411), and first and second linear portions (412, 413). The fuse is disposed in at least one of the first and second linear portions and is remote from the arc-shaped portion, and an extending part (302) of the impeller is encircled by and spaced apart from the arc-shaped portion. A dishwasher including the heat pump is also provided.