The main reasons why the temperature of the parking heater is not reached when it is used:

The temperature of the parking heater can't be reached. Generally, the power is not high. Can increase the practical power to complete. If it is confirmed that the practical power is not small, it is caused by the material of the barrel. Different raw materials absorb different heat at different operating frequencies. The resonant capacitance should be tested and added, and the Q value should be added to improve the high-frequency current of the coil. It can make the temperature in the barrel surface uniform to improve the temperature of the barrel.