Using this thermostat is easy. First, make sure your electric hot - water service is turned off. Then, mount the thermostat on the surface following the provided instructions. Adjust the temperature within the 60 - 90 degrees C range according to your needs. When using, always ensure the power supply is stable and within the rated 240VAC 30amp. If you're unsure about the installation or operation, contact us. For maintenance, keep the thermostat clean and free from dust. Periodically check the screw terminals to make sure they are tight. If you have any problems, reach out to us, and we'll assist you.