The DEFA interior heater is specially designed for use in cars, and is supplied with fuses to prevent overheating and fire. The new technology used in the heating element, with self-regulating power output depending on the ambient temperature, provides high power at low temperatures, with power consumption falling gradually as the interior temperature rises. Our aim was to develop small interior heaters that can be easily integrated without spoiling the appearance of the car. The interior heater is installed using separate brackets, guaranteeing easy installation.