while BRG0740 is the legacy reference often found in older service manuals and unit nameplates

The kit includes the EL1214-P sensing probe with a long nut

Reliable OEM Performance: Designed as a direct replacement part

ensuring seamless integration with existing 24V control circuits and burner assemblies

Lochinvar & A.O. Smith 100289391 Pressure Switch 30067439-890 while BRG0740 is the legacyThe Lochinvar & A. O. Smith 100289391 Pressure Switch is a critical safety component engineered for high efficiency condensing water heaters and commercial boilers. Calibrated to a 0. 55" WC (Water Column) set point, this direct replacement for 100294588 monitors the induced draft blower to ensure proper venting of combustion gases. In the field, this switch is the primary defense against blocked flue conditions and inducer motor failure, preventing