Pump and dishwasher comprising the same

A pump comprising:

• a housing configured to receive washing water;
• an impeller that is located inside the housing and that is configured to rotate with respect to the housing, the impeller being configured to cause flow of washing water;
• and
• a heater that is coupled to a lower side of the housing, that is configured to heat washing water in the housing, and that is configured to generate steam from washing water in the housing,
• wherein the housing comprises:
• a pump lower portion configured to receive washing water based on rotation of the impeller,
• a pump upper portion configured to, based on rotation of the impeller, discharge washing water and steam from the housing, the pump upper portion defining an upper chamber that accommodates the impeller, and
• a partition wall that divides the housing into the pump lower portion and the pump upper portion, and
• wherein the pump upper portion comprises:
• a washing water outflow pipe disposed above the partition wall and configured to discharge washing water in a first direction, and
• a steam discharge pipe disposed above the partition wall and configured to discharge steam in a second direction opposite to the first direction.