this motor is a critical component for restoring system head pressure

making it ideal for large commercial ranges and high-output boilers

Technicians prefer the A30 series for its rugged construction and repeatable accuracy in low-ambient cooling conditions

monitoring internal heat exchanger temperatures to prevent hazardous overheating

Lochinvar & A.O. Smith 100187859 Switch 318172-701 this motor is a criticalThe Lochinvar & A. O. Smith 100187859 Switch is a critical 2. 0" blocked outlet switch designed for high efficiency gas fired commercial water heaters and boilers. As a genuine OEM replacement part, this pressure switch is calibrated to detect vent obstructions, ensuring the system shuts down safely if exhaust gases cannot be properly expelled. It is commonly utilized in A. O. Smith Cyclone BTH 300A series and comparable Lochinvar Power Fin models.