220V 1000W Boiler Thermostat Controller Circulation Pump Mechanical Temperature Regulator Intelligent Control with Sensor Features: The pump automatically starts when the water temperature reaches the set point and stops when it drops below it. Specification: Voltage: 220V Power Consumption: 3W Temperature Range: 0 to 100 ℃ Hysteresis Temperature: 5 Celsius Temperature Switching Deviation: ± 2 Ambient Temperature: -5 to 50 Celsius Size: 122mm * 90mm * 46mm (L * W * H) External Sensor: Lead length 1m, rubber Rerong package. Measurement Range: 5-100 degrees Current: 5A Error: ± 2 ℃ Installation Method: First, fix the thermostat 1m from the boiler. Attach the temperature probe to the highest point of the boiler's water temperature. Connect the pump's power to the thermostat and then connect the thermostat to the main power supply. Once powered on, the thermostat will function. Adjust the temperature control knob to set your desired temperature. Precautions: 1. The temperature probe must not be attached to surfaces exceeding 100 degrees, such as oven chimneys. 2. The surface temperature of the boiler may have a slight difference from the circulating water temperature, but this does not affect the pump's automatic circulation. 3. Power connections must be tightened securely for proper operation. 4. Size is for manual measurement; there may be a 0 to 2 mm error, which is a normal phenomenon. Package Includes: 1x Thermostat Controller with Sensor