King Electric K101 Single-Pole Line-Voltage Mechanical Thermostat

King Electric K101 is a single-pole, line-voltage wall thermostat for heat-only control of electric heaters at 120, 208, 240, or 277 VAC up to 25 A; it features a large, easy-turn knob, a bi-metal mechanical sensor with ±3 °F accuracy, °F/°C dial plates, flush-mount styling, and no-ground-wire installation on a standard 2×4 electrical box, with a 41–90 °F (5–32 °C) setpoint range and a 1-year limited warranty.