Lochinvar & A.O. Smith 100263932 Thermistor 321894-709 the VT3213 is the valve

the VT3213 is the valve body only

Standardized Form Factor: Round capacitor housing allows for quick installation in existing Lennox motor assemblies

It maintains the same 8-inch probe dimensions and resistance curve

BMS Integration: Ideal for building management system enclosures where precision mounting of sensors and I/O modules is required

Lochinvar & A.O. Smith 100263932 Thermistor 321894-709 the VT3213 is the valveWhen you're dealing with inconsistent water temps or persistent E5 error codes on a high efficiency unit, the Lochinvar & A. O. Smith 100263932 Thermistor is the OEM replacement part you need to restore precise temperature regulation. This Negative Temperature Coefficient (NTC) sensor is the general lower thermistor, designed to monitor the bottom of the tank and provide the control board with the real time data required for accurate burn modulation