3KW Electric Thermostat for Hot Tub, SPA, Bathtub & Swimming Pool Heater

Overview: This 3KW electric thermostat is designed for hot tubs, massage baths, SPAs, bathtubs and small swimming pool heaters. It includes an ultra-high temperature protection switch to prevent overheating and protect users. Commissioning / First-use check: After installation, perform safety checks before first operation. Fill the tub to the proper water level and start the system so the unit can run an automatic self-check. Let it operate until the thermostat reaches its highest internal stabilization point and the display lights turn off. Use an accurate thermometer to verify the water temperature — it should read 40 °C. Operation and control: - The thermostat runs fully automatically. Turning the control knob clockwise activates heating; the indicator light will show when heat is on. - Once the preset temperature is reached, the unit will maintain that temperature. - If the system is started with cold water, the water temperature will rise at approximately 6 ~ 8 °C/h. - The thermostat keeps the water temperature within a range that does not exceed 40 °C (104 °F). Automatic safety shutoff: If the water temperature exceeds 49 °C, the ultra-high temperature switch will automatically trip and cut power to the unit to prevent danger.