With the gradual popularity of smart home, there are more and more household appliances that use NTC thermistors for temperature monitoring, temperature control and temperature protection, electric water heater is one of the most common. Nowadays, most electric water heaters on the market have realized automatic temperature control, make users have more convenient and safer experience in using process.

Automatic temperature-control electric water heater commonly includes housing, cold water inlet pipe, outlet pipe, NTC thermistor, electric heating rods, float level gauge, solenoid valve and limit switch. The electric heating rods are arranged above the bottom of the housing, and located at the bottom of the middle of the housing. The electric heating rods are connected with the external power supply, and the positive pole of the external power supply is successively connected with the positive pole of the electric heating rods through the NTC thermistor and electromagnetic switch, and the negative pole of the electric heating rods is connected with the negative pole of the external power supply; NTC thermistor is arranged in the housing; The housing is provided with a float level gauge for measuring the water level in the housing; The cold water inlet pipe is provided with a solenoid valve. The solenoid valve and the float level gauge are electrically connected with the main control chip, the main control chip is a single chip microcomputer, which controls the solenoid valve through a relay.

Automatic temperature-control electric water heater monitors water temperature changes through NTC thermistor. When water temperature rises and its value reaches a certain threshold value, the resistance value of the NTC thermistor decreases; At this time, the current flowing into the electromagnetic switch increases, and the magnetic force of the electromagnet in the electromagnetic switch increases, so that the electromagnetic switch is disconnected and the electric heating rods stop heating. When the water temperature drops to a certain threshold value, the resistance value of the NTC thermistor increases; At this time, the current flowing into the electromagnetic switch decreases, and the magnetic force of the electromagnet decreases, so that the electromagnetic switch is closed and the electric heating rods are heated. Automatic temperature-control electric water heater is the use of NTC thermistor and electromagnetic switch to control the electric heating rods to achieve automatic temperature control.

The epoxy resin NTC thermistor produced by EXSENSE Electronics Technology Co., Ltd. has the characteristics of high reliability, great electrical performance and high cost performance, ensuring the safety of the automatic temperature-control electric water heater in the working process, making it convenient for users to control when using, and achieving automatic temperature regulation.