Lochinvar & A.O. Smith 100109721 Upper Probe 321142-301 Direct OEM Replacement: Replaces obsolete

Direct OEM Replacement: Replaces obsolete part numbers 46233 and 259518 for seamless box-to-box installation

This pink valve cartridge is specifically engineered for Sporlan BQ series valve bodies

Burnout often results from incorrect supply voltage

50" WC switch to fail to close

Utilizing an adsorption charge within its 2000mm (approx

Lochinvar & A.O. Smith 100109721 Upper Probe 321142-301 Direct OEM Replacement: Replaces obsoleteThe Lochinvar & A. O. Smith 100109721 Upper Probe is a critical OEM replacement part engineered for the inner control assembly of high efficiency commercial water heaters. As a high performance hot surface igniter, this 100109721 probe is essential for ensuring reliable ignition cycles and precise flame sensing in BTH Series units. Designed to meet exact factory specifications, it eliminates the common failure points associated with generic