Water-cooled motor

The motor (1) has a heat film (3) arranged on an outer side of an enclosing, heat insulating encapsulation (2), where the encapsulation is made of polyurethane, and the heat film is made of gold or aluminum foil. A heat insulating connection piece (5) i.e. insulation disk, is mounted between the motor and a mounting flange (4), where the connection piece is made of an extremely durable and temperature-resistant material. An independent claim is also included for a method for assembling a motor.