Liquid heating pump for conveying and heating liquid in a household appliance which uses water, in particular a household dishwasher heating pump or washing machine heating pump, - comprising a centrally arranged suction channel for suctioning the liquid in an axial suction direction and supplying the suctioned liquid into an impeller chamber arranged axially downstream, - comprising an impeller which can be driven in a rotating manner in the impeller chamber for conveying the liquid into a diffusor and/or pressure chamber arranged axially downstream, viewed counter to the suction direction, and which is arranged externally, in particular coaxially, at least around a partial portion of the suction channel, - comprising a stationary diffusor in the diffusor and/or pressure chamber, wherein the diffusor comprises a main body, the front wall thereof facing the impeller chamber forming a front defining wall of the impeller chamber, - comprising a heating device associated with the diffusor chamber for heating the conveyed liquid, wherein the heating device in particular comprises at least one, preferably axially extending, partial portion of an external defining wall of the diffusor and/or pressure chamber and the axial outer casing of the main body of the diffusor in particular forms at least one, preferably axially extending, partial portion of an internal defining wall of the diffusor and/or pressure chamber, - and comprising a discharge port for ejecting the liquid, characterised in that the main body of the diffusor on its front wall facing the impeller chamber positionally defined by its outer periphery comprises one or more guide blade portions which axially protrude in the direction of the impeller, which in each case protrude into a liquid ejection region of the impeller arranged around the outer periphery of the impeller and extend in each case away from said liquid ejection region, in particular positioned obliquely deviating from the radial direction in the impeller direction, toward the axial outer casing of the main body, in particular as far as the axial outer casing of the main body, which is arranged further radially outwardly than the liquid ejection region of the impeller. - comprising a centrally arranged suction channel for suctioning the liquid in an axial suction direction and supplying the suctioned liquid into an impeller chamber arranged axially downstream, - comprising an impeller which can be driven in a rotating manner in the impeller chamber for conveying the liquid into a diffusor and/or pressure chamber arranged axially downstream, viewed counter to the suction direction, and which is arranged externally, in particular coaxially, at least around a partial portion of the suction channel, - comprising a stationary diffusor in the diffusor and/or pressure chamber, wherein the diffusor comprises a main body, the front wall thereof facing the impeller chamber forming a front defining wall of the impeller chamber, - comprising a heating device associated with the diffusor chamber for heating the conveyed liquid, wherein the heating device in particular comprises at least one, preferably axially extending, partial portion of an external defining wall of the diffusor and/or pressure chamber and the axial outer casing of the main body of the diffusor in particular forms at least one, preferably axially extending, partial portion of an internal defining wall of the diffusor and/or pressure chamber, - and comprising a discharge port for ejecting the liquid, characterised in that the main body of the diffusor on its front wall facing the impeller chamber positionally defined by its outer periphery comprises one or more guide blade portions which axially protrude in the direction of the impeller, which in each case protrude into a liquid ejection region of the impeller arranged around the outer periphery of the impeller and extend in each case away from said liquid ejection region, in particular positioned obliquely deviating from the radial direction in the impeller direction, toward the axial outer casing of the main body, in particular as far as the axial outer casing of the main body, which is arranged further radially outwardly than the liquid ejection region of the impeller.