The principle of liquid heater is: temperature heating PTC thermistor has constant temperature heating characteristics, its principle is PTC thermistor after powering on from heat heating to make the resistance value into the transition zone, constant temperature heating PTC thermistor surface temperature will maintain a constant value, the temperature is only related to the Curie temperature and applied voltage of the PTC thermistor, and basically unrelated to the ambient temperature. PTC heater is a heating device designed by using constant temperature heating PTC thermistor and constant temperature heating characteristics. In small and medium-power heating occasions, PTC heaters have the advantages of constant temperature heating, no open flame, high thermal conversion rate, minimal influence by power supply voltage, long natural life and other traditional heating elements, and their application in electric heating appliances is increasingly favored by R&D engineers. Constant temperature heating PTC thermistors can be made into a variety of shape structures and different specifications, common are disc shape, rectangle, long strip, ring and honeycomb porous. The combination of the above PTC heating elements and metal components can form various forms of high-power PTC heaters
