Engine preheater with built-in pump

The utility model relates to an engine preheater with a built-in pump, which is used for the cold starting of a mobile vehicle. The utility model using the ordinary civilian power supply utilizes a built-in centrifugal pump and an electrothermal element to heat the antifreeze of an engine. The utility model includes a shell, a vane wheel, an electric motor and the electrothermal element, a water inlet and a water outlet are arranged on the shell, the vane wheel faces the water inlet, and the vane wheel and the shell form a centrifugal pump structure. Because the whole or the part of the electric motor is positioned in the shell, the length of the preheater in the axial direction of the electric motor can be produced short, the volume of the preheater can also be greatly reduced, and therefore the preheater can be conveniently mounted on the mobile vehicle. A rotor made of permanent magnetic materials operates in the antifreeze.