VAILLANT THERMOCOUPLE MAG VCW 17-1125 171125

A safety device used in Vaillant boilers to monitor the pilot flame. It generates a small electric voltage when exposed to heat, signaling the gas valve to remain open, allowing the boiler to continue operating. If the pilot flame goes out, the thermocouple stops producing voltage, leading to the gas valve closing automatically as a safety measure, preventing gas leaks and ensuring safe boiler operation.