TOPCHANCES Electric 220V 3KW 50HZ Swimming Pool Heater & SPA Water Bathe Bath Hot Tub Thermostat &#12304 Manual Reset Temperature Control Switch&#12305 The coasts thermostats are equipped with an ultrahigh temperature protection switch to limit the thermostat to overheat and protect the user from danger.Once unexpected high temperature 60C occurs, the temperature switch cuts off the system.You need to cut off the main power supply, resolve the fault and wait the temperature to fall below normal temperature, then press the Reset button to restart the heater &#12304High Quaility with UL Certification&#12305 We are professionals in producing and developing heaters for over 10 years. ST and PHS are the newest generation with our unique control system. With this advanced control system, the traditional mechanical water flow sensor is replaced by modern digital temperature sensor . &#12304Easy to install &#12305 Power supply according to the power of the thermostat equipped with the appropriate power cord, the thermostat comes with the 3-pin power cord connected to the terminal near the terminal box, the power supply for the 230V / 50 ~ 60Hz, brown fire line that L terminal, blue The dyed line is the N terminal, and the yellow and green lines are connected to the ground line. &#12304 Notication&#12305 220V 3kW of coasts thermostats are designed to maintain a pre-set temperature level in the standard bath water temperature not exceeding 40  C (104  F) . However, if the bath is cold during start-up, the coasts thermostat will raise the temperature by 6 to 8  C / h depending on the initial water temperature, room temperature and bath size. &#12304Warning&#12305 Do not allow any electrical supplies (such as lights, telephones, hair dryer, radio or TV) in the bathtub within 1.5 meters (5 feet). The thermostat shall not be used in brine, acid or alkaline water, nor can it be used in other places with chemical corrosive gases or solvents.