DEFA Termini cabin heaters use PTC (PTC = Positive heat) which automatically adjusts the output power according to the temperature at the air inlet. coefficient thermistor) heater element is used. Every 20°C temperature increase causes a 10% power decrease and the cabin temperature As electricity consumption increases, it gradually decreases. The cabin heater has automatic overtemperature protection.

DEFA Termini cabin heaters have been tested and approved by EN 60335-1 and EN 50408 Safety Standards.