$85 · White Rodgers Heavy Duty Line Voltage Thermostat

For sale is a White Rodgers Heavy Duty Line Voltage Thermostat. I'm going to be honest and admit that I don't know a lot about this unit. My Dad used it in his greenhouse to control the heater, with this thermostat plugged in-line between the heater and and extension cord leading to an outdoor plug. Box measures 5.25 x 2.5 x 2.25 inches. Overall length including coil and cords is approximately 16 inches. Approximately $175 brand-new for the thermostat itself, without the cords.