The mechanical thermostat is made of a bimetallic material, such as the starter of the fluorescent lamp. It is made by using the principle that different metal materials expand and contract due to changes in temperature. The electronic thermostat is made of a thermal element and an amplifier circuit to control a relay! If you want to buy a thermostat, Shaanxi Huiyu Mechanical and Electrical Equipment Co., Ltd. has the largest and most comprehensive range. You should be assured of quality and after-sales service. We have cooperated for so many years, and they all say that we have the best reputation