Use this Stelpro Maestro(TM) thermostat with the Maestro(TM) controller/thermostat to turn your house into a smart home in a snap! Indeed, the Maestro(TM) thermostat reveals its full potential when it's paired with the Maestro(TM) controller/thermostat. It can also be linked to an existing Zigbee network controlled by any Zigbee-compatible controller. 4000W/240V - 2000W/120V. 2- or 4-wire connection. 3-year warranty.