A millivolt thermostat wiring diagram is an essential resource when working with millivolt heating systems, commonly found in gas fireplaces, stoves, and some older furnaces. Understanding these diagrams is crucial for safe and effective installation, troubleshooting, and repair of your heating system. Unlike standard thermostats that use 24V power, millivolt systems generate their own electricity, typically in the range of 250 to 750 millivolts, using a thermocouple heated by the pilot light. This low-voltage system simplifies wiring but still requires careful attention to detail to ensure proper operation.
