1. Flow-TEMP Sensor Technology 1. The sensor precisely monitors the temperature change of the whole system, and cooperates with the control unit to guarantee a proper working environment for the heating elements and the correct customer setting temperature. 2. No mechanical switch is used, thus avoiding any problem caused by mechanical faults. 3. Avoiding any particulate conglomerating on sensors. 4. Dramatically reduce the number of unnecessary circulation cycles, which extends the life of circulating pump and use less energy.