Thermostat; Type Non-Programmable, Manual Changeover, 1-Heat; Cover Type Classic Style Round; Color Premier White; Voltage Rating 20 to 30 Volt AC at 50/60 Hertz; Current Rating 0.02 to 1 Amp Running (Heat); Switch Type Relay; Size 3-11/16 Inch Diameter x 1-3/4 Inch Depth; Power Method Battery Assisted Power Stealing; Sensor Element Thermistor; Terminal Designation R, W, Y