Features The products are used in solar water heater, the temperature difference and temperature to control the output. It is provided with two output control, temperature difference control two temperature zone. When the temperature reaches the set value, it automatically runs the water pump circulation and makes the two temperature zone temperature equilibrium. The other channel controls electric heating, when the solar heating failed to reach the set temperature, the electric heating system can automatically start and heat to the set temperature. It will control heating system and automatically makes water temperature stay in temperature deference range. Specifications:Working Voltage: AC220V ±10%(50Hz/60Hz)Output Load: 5A/220V/ACPower Consumption: ≤3WHeating Control Range: 2℃~99℃ Temp. Difference Start Control: 3℃~50℃Resolution: 1℃Precision: ±1℃Input Signal: 2-channel sensor, 20KX2MX2 Size: 76*76*35mm/2.99*2.99*1.37inOperating Temperature: -10℃~50℃Operating Humidity: RH≤90% LightFunctionSetting RangeDefaultUnit#1temperature difference startstop pump temperature difference +1~505℃#1, #2stop pump temperature difference1~temperature difference start-12℃#2temperature return difference1~205℃#3high temperature correction-10~100℃#4low temperature correction-10~100℃ Package Includes:1 x Temperature Controller2 x Sensor Probes Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List