A dishwasher comprising: a tub configured to receive objects to be washed; a spray arm configured to spray wash water to the objects to be washed; a sump configured to store wash water; and a pump configured to supply the wash water stored in the sump to the spray arm, wherein the pump comprises: a body ; a partition wall configured to divide an interior of the body into two spaces; a first chamber (C1) located under the partition wall , the first chamber (C1) having an introduction portion communicating with the sump ; a second chamber (C2) located above the partition wall , the second chamber (C2) having a discharge portion communicating with the spray arm ; a communication hole formed through the partition wall to allow the first chamber (C1) and the second chamber (C2) to communicate with each other therethrough; an impeller provided in the second chamber (C2) to move wash water to the discharge portion ; a heater assembly (H) separately coupled to an opening surface provided at a lower part of the body , the heater assembly (H) including a housing configured to close the opening surface and form the bottom surface of the first chamber (C1), and a heater provided outside of the first chamber (C1) and configured to heat the housing , the housing being made of a conductor such that thermal energy generated by the heater can be effectively supplied to wash water in the first chamber (C1). a tub configured to receive objects to be washed; a spray arm configured to spray wash water to the objects to be washed; a sump configured to store wash water; and a pump configured to supply the wash water stored in the sump to the spray arm, wherein the pump comprises: a body ; a partition wall configured to divide an interior of the body into two spaces; a first chamber (C1) located under the partition wall , the first chamber (C1) having an introduction portion communicating with the sump ; a second chamber (C2) located above the partition wall , the second chamber (C2) having a discharge portion communicating with the spray arm ; a communication hole formed through the partition wall to allow the first chamber (C1) and the second chamber (C2) to communicate with each other therethrough; an impeller provided in the second chamber (C2) to move wash water to the discharge portion ; a heater assembly (H) separately coupled to an opening surface provided at a lower part of the body , the heater assembly (H) including a housing configured to close the opening surface and form the bottom surface of a body ; a partition wall configured to divide an interior of the body into two spaces; a first chamber (C1) located under the partition wall , the first chamber (C1) having an introduction portion communicating with the sump ; a second chamber (C2) located above the partition wall , the second chamber (C2) having a discharge portion communicating with the spray arm ; a communication hole formed through the partition wall to allow the first chamber (C1) and the second chamber (C2) to communicate with each other therethrough; an impeller provided in the second chamber (C2) to move wash water to the discharge portion ; a heater assembly (H) separately coupled to an opening surface provided at a lower part of the body , the heater assembly (H) including a housing configured to close the opening surface and form the bottom surface of the first chamber (C1), and a heater provided outside of the first chamber (C1) and configured to heat the housing , the housing being made of a conductor such that thermal energy generated by the heater can be effectively supplied to wash water in the first chamber (C1). <EOS>