Laars Heating Systems E0253900 Thermistor Probe 318518-761 Ensure the inlet is at

Ensure the inlet is at the bottom and install a full-port isolation valve to facilitate future servicing

but a yearly inspection and replacement cycle is the standard professional recommendation

What are the mounting requirements for a 3-inch flanged valve

Simply use a 1/2-inch socket to drop the basket from the hex port and swap in this assembly for a reliable fix

For complex dual fuel (fossil fuel kit) applications

Laars Heating Systems E0253900 Thermistor Probe 318518-761 Ensure the inlet is atThe Laars Heating Systems E0253900 Thermistor Probe is a precision engineered temperature sensor designed for high performance integration within commercial boilers and volume water heaters. This OEM thermistor utilizes an NTC (Negative Temperature Coefficient) semiconductor element to provide real time thermal monitoring, ensuring the control board can accurately modulate burner firing rates and maintain setpoint stability. Built for compatibility