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Answer: a safety device ensuring that the pilot flame of a gas water heater is always on.
The thermocouple is a safety device present in gas water heaters fitted with a pilot light, which checks whether or not the pilot flame is always on. The thermocouple is so called because it is made up of two different metals. When it is placed in the pilot flame, a current is created. Without flame, no current. Thanks to this device, as soon as the pilot flame goes out, the gas supply is cut off almost immediately. This helps prevent leaks. Some thermocouples are universal and adapt to all gas water heaters on sale, but others are specific to a few brands. If the pilot flame often goes out, it is a sign that the thermocouple must be changed, fortunately it only costs 5 to 10 €. You too, send us your brico question