Robertshaw 200-502 Millivolt stat

The Robertshaw 200 Series Thermostats are decorator designed and engineered for outstanding performance. All models feature Uni-Line famous sealed-in-glass switch which requires NO LEVELING AND OPTIMUM PROTECTION FROM SWITCH CONTAMINATION. Models are available for 24 volt heating or cooling, millivolt heating, 2- or 3-wire zone, and with energy saving heating or cooling ranges. A decorating wall plate is included with all models to cover old thermostat mounting marks.