US Patent 9297553 Pump assembly

A pump assembly includes a motor and a pump, with the motor having an output shaft that extends into a volute chamber defined by a housing of the pump. An impeller may be mounted to the end of the output shaft. A heating element maybe located within a projection formed in an end of the housing and defines a heat transfer area confronting the volute chamber, wherein heat generated by the heating element may be conducted into the volute chamber.