The Intermatic PF1103MT 120/240V Freeze Protection Control with Timer is designed to protect the Pool or Spa equipment and plumbing against freeze damage. It will turn on the pump and the heater when the outdoor temperature drops below the temperature set by the user adjustable thermostat. The timer provides both automation and protection for the equipment. The control can be installed outdoors and is designed to withstand extreme temperatures, high humidity, rain and chemicals typically found around pools and spas. The Freeze Protection Control with Timer requires an Enclosure. The Control is also available in 120/240V with an Enclosure or 240V without an Enclosure.