Patent ID: 7455065

Claim:
A household appliance having a liquid circuit and a pump having a pump casing with a heating element for heating a liquid, said heating element having a heat-conducting contact area with at least a partial form fit to fit in an outer shape ( 2 ) of the casing ( 1 ) with a contact area ( 20 ) on an outside surface of the casing being at least half the size of the entire outer area of the heating element which outside surface of the casing faces away from the tub interior and a liquid circuit wherein the improvement comprises an outer depression in a casing ( 1 ) that projects into a liquid circuit and faces a pump shaft 15 and pump impeller 16 said outer depression forming a protrusion ( 8 ) on an inside surface of said casino a first channel and a first heating area substantially surrounding said pump impeller and a second channel and a second heating area in substantial axial and radial alignment with said first channel and said first heating area and an annular groove ( 2 ) on the outside surface for mounting said heating element ( 3 ) into said casing, said casing having a depression deeper than the corresponding height (h) of the heating element ( 3 ) and said protrusion ( 8 ) on the inside of said casing ( 1 ) having a projection (a) on the outside of said casing projecting beyond the height (h) on both sides of said heating element in said annular groove ( 2 ).