The Eccotemp FVI12 outlet water temperature sensor is only for the FVI12-NG or the FVI12-LP models. It reads the temperature of the water coming out of the unit and is not to be confused with the over temperature sensor.
Customer assumes all liability when purchasing replacement parts.
With a properly sized Eccotemp tankless water heater, you will never run out of hot water and significantly reduce your energy consumption. Eccotemp tankless water heaters are the future of efficiency.