A closure bottom plate 1 for electric pump 100, in particular for a boiler circulation centrifugal pump, is made of a cup-shaped motor cover 2 and a connector-holder cover 3. The bottom plate 1 has an internal aeration path 4, intended to allow the circulation—by natural convection—of air which is heated during the operation of the electric pump 100 preventing the formation of condensate inside the bottom plate 1. The internal aeration path 4 is extended between at least one inlet opening 22 arranged on the motor cover 2 and an outlet opening 36, successively crossing the internal volume of the motor cover 2, the coupling opening 21, and a labyrinth 32 defined by the connector-holder cover 3.