An electric pump can have a stator with a stator core defining a plurality of poles, a coil of electrically conductive material extending around each respective one of the plurality of poles, and a stator-cooling chamber, as well as an impeller coupled to a rotor. A first region can be at least partially occupied by the impeller and fluidicly coupled with the stator-cooling chamber to convey a working fluid from the first region into the stator-cooling chamber. The stator-cooling chamber can be configured to facilitate heat transfer from the stator core and/or the coils to the working fluid in the stator-cooling chamber. Cooling systems can incorporate such a pump. Related methods also are disclosed.