The Toyotomi 20477073 is a genuine Room Temperature Thermistor for HC-20, HC-20B, HC-190, HC-190B. Senses room air temperature so the convector control board can hold the set point. Replace when the unit reads room temperature wrong or throws a sensor error.
This is an OEM Toyotomi part, so it fits and performs the way the original did. Confirm your heater model before ordering; the model is on the rating label on the unit. If you are not sure which part you need, Rural Energy support can check it against your model and serial number.
Rural Energy is a Toyotomi distributor and keeps HC-20 and HC-190 heat convector parts in stock for fast shipping to dealers and homeowners.