Pay in 4 interest-free payments of $37.07 Learn more
Ships within 48 hours · Estimated delivery Sep 12 - Sep 17
Use a manometer to confirm the system is pulling at least
Utilizing an adsorption charge within its 2000mm (approx
the S1-024-40900-000 wiring diagram may differ slightly from older models
Direct OEM Replacement: Replaces obsolete part numbers 46233 and 259518 for seamless box-to-box installation
Lochinvar & A.O. Smith 100109721 Upper Probe 321142-301 Use a manometer to confirmThe Lochinvar & A. O. Smith 100109721 Upper Probe is a critical OEM replacement part engineered for the inner control assembly of high efficiency commercial water heaters. As a high performance hot surface igniter, this 100109721 probe is essential for ensuring reliable ignition cycles and precise flame sensing in BTH Series units. Designed to meet exact factory specifications, it eliminates the common failure points associated with generic
US$ 79.00
US$ 249.50
US$ 64.00
US$ 130.00
US$ 88.00
US$ 37.23