Intermatic PF1103M Thermostat Mechanism only 120/240 VAC, 1.5/3 HP Used to protect pool and spa equipment and plumbing against freeze damage They turn the pump and heater ON when the outdoor temperature drops below the temperature set by the user-adjustable thermostat 34/1000-Inch drawn steel, electrostatically coated, beige color enclosure 93/8-Inch (23.8 cm) Height by 51/4-Inch (14.0 cm) Width by 35/8-Inch (9.2 cm) Diameter