Purchased but never installed it. So it's New for you. $150 Firm 220 wiring ready for instillation. The ST series thermostats are designed for home small pools below 10-15m³, massage pools and spa pools (SPA POOL), aquariums for heating and insulation, and can also be used as auxiliary heating equipment for pool heat pumps. Features: 1. The sensor is always under the control of the single-chip microcomputer, to monitor the temperature condition of the entire heating system and the flow of water accurately and timely, to ensure the user sets the water temperature while ensuring that the heating element operates reliably under suitable water flow conditions. 2. No mechanical switch sensor - avoids a series of switch failures due to mechanical switch failures. 3. Can avoid the sensor malfunction because of the accumulation of scale, magnetic material, hair and suspended matter. 4. It reduces the circulation of water during non-heating, prolongs the service life of the circulating pump, and is also more energy efficient. 5. Comprehensively monitor the operating status of the system, and quickly make corresponding judgments and displays, so as to avoid the occurrence of faults such as dry water and dry burning in the absence of water, and it is more convenient for users or maintenance personnel to judge and maintain the fault. 6. The heating thermostat liner material is 316 stainless steel, and the electric heating tube provided by Duan Dian Baker Company which has good corrosion resistance (chlorine corrosion). 7. Special design of the thermostat liner, good flowability, no slag, easy to disassemble. 8. The machine is convenient for maintenance, the original electrical parts are easy to replace, the external wiring is less, and the installation cost is low. 9. The thermostat has multiple protections, safe and reliable - over current, ultra high temperature, short circuit to the power supply line, water flow protection. 10. The thermostat performs segmented start-up of the electric heating pipe - the current impact on the power supply line is small, and does not affect the normal operation of other household appliances and electronic products. Specification: Model: ST Available area: 10-15m³ Power: 9KW Current: AC 220V Voltage for choice: 220V, Wire: 3x16mm Net weight: 7.5KG