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The Navien 30009478A is an exhaust thermistor designed for NPE-180A, NPE-210A, and NPE-240A high efficiency condensing tankless water heaters. This component is essential for ensuring accurate temperature readings, contributing to the efficient operation of these water heater models. It plays a critical role in the temperature regulation process, preventing overheating and ensuring optimal performance.
This exhaust thermistor enhances the functionality of your tankless water heater.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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