The TDV1 Digital Thermostatic Wired Wall Switch is designed for millivolt systems including but not limited to the Empire DV10, DV15, DV25, and DV25 series heaters and provides a premium wired wall thermostat for use with your Empire fireplace. This system mounts on a wall for easy fireplace control. This set-and-forget option keeps your room from getting too hot or too cold, ensuring comfort year-round, and is designed for use with millivolt valves only.