The heat exchanger thermistor on a Rinnai HDC1500i or HDC1500e monitors water temperature at the heat exchanger, feeding that reading to the control board so it can manage combustion and burner modulation correctly. It's a distinct sensor from the outlet thermistor, giving the control system visibility of temperature at a different point in the water path.
This genuine Rinnai heat exchanger thermistor is made to the original specification for the HDC1500i/e, restoring accurate temperature monitoring where the existing sensor has drifted or failed. Fitting the genuine part as part of servicing helps the appliance manage combustion and temperature control as designed.
⚠ Important: Installation and servicing must be carried out by a qualified technician familiar with Rinnai products. Turn off the gas supply and disconnect power before beginning any servicing.
If your HDC1500i or HDC1500e is showing erratic temperature behaviour or throwing fault codes that don't clearly point to a cause, a faulty heat exchanger thermistor is worth checking — the control board can only manage combustion as well as the data it's receiving. This genuine part restores that accuracy, fitting and performing exactly as the original sensor did.
Order the Rinnai Replacement HDC1500i/e Heat Exchanger Thermistor online today.
| Manufacturer | Rinnai |
|---|---|
| Part Number | P1500-KITF |
| Product Type | Heat Exchanger Thermistor |
| Compatible Models | Rinnai HDC1500i / HDC1500e |
| Application | Water Heater Servicing & Repair |
| Installation Requirement | Qualified Technician Required |
