Does anyone know how I can find a replacement thermocouple for an Infinion C13e tankless water heater purchased from a company that is no longer in business? Are thermocouples interchangeable?

Are there any markings on the bad thermocouple? Sometimes a company making a product like a water heater will build it with some parts that are already available from other sources instead of designing that part themselves. Why reinvent the wheel and all that.

So if you are lucky the thermocouple was made by a company still in business and it is still available from them or compatible ones exist.

Also, if you have any paperwork on the water heater it might give the voltage spec on the thermocouple. Typically it will have a rating of so many millivolts at a certain temp. I wouldn't be surprised that there is a compatible one out there somewhere. If all else fails, if you find one that is the right physical size to fit into the gas valve I'd try it. It's job is to keep the input gas valve open as long as the pilot light remains lit and the thermocouple stays hot, and close the gas valve if the pilot light goes out. Safety thing. If you have a voltmeter that measures low enough you can test the old thermocouple by connecting the meter to the end that goes into the gas valve, and heat the other end with a candle.



Edited 6 times.