The M8 smooth head thermocouple of 1200 mm is a fundamental safety component in gas systems, such as heaters and boilers. Its main function is to detect the presence of a flame and ensure the correct ignition of the burner. It consists of a thermal sensor that generates a small electrical voltage when heated by the flame, allowing the gas valve to remain open. If the flame goes out, the thermocouple cuts off the gas supply to prevent leaks and possible accidents.

What problem does this replacement solve?

• The heater or boiler does not ignite or constantly loses flame.
• The gas safety system locks due to erroneous detection of flame absence.
• Gas leaks caused by failure in the flame detection of the original thermocouple.

This thermocouple is compatible with a wide variety of heaters and boilers that use thermocouples with M8 metric thread and 1200 mm length.

• SIT Standard heaters and boilers (models with M8 thermocouple)
• Junkers WRD 11-2B, WRD 14-2B
• Vaillant VCK 226/3-5, VU 242/3-5
• Bosch Therm 4000 O, Therm 8000 S (models with M8 thermocouple)
• Fagor gas heaters with M8 thermocouple

• Part type: thermocouple with smooth head
• Compatible brand: universal for SIT systems and similar
• Code(s): M8 x 1 thread, length 1200 mm
• Measurements: thread diameter 8 mm, total length 1200 mm
• Material: thermocouple sensor in nickel-chromium alloy
• Use: flame detection and safety in gas systems

Before purchasing, verify the code of the original thermocouple or the exact model of the heater or boiler to ensure compatibility with this 1200 mm M8 thermocouple.