This ASME Section IV rated component is a direct HVAC replacement part for legacy 740 series installations

which are the industry standard for dual fuel or 2-speed blower operation in industrial heaters

5" WC Natural Gas output for clean burner operation

long-term 3% RH accuracy and digital temperature sensing

Lochinvar & A.O. Smith 100277784 Impeller 326058-755 This ASME Section IV ratedThe Lochinvar & A. O. Smith 100277784 Impeller is a critical OEM replacement part engineered for high recovery commercial water heaters and industrial boiler systems. As the professional grade successor to the legacy 100133556 part number, this centrifugal pump impeller ensures precision fluid dynamics and optimal head pressure within the heat exchanger circuit. Built to withstand the rigorous cycling of hydronic heating equipment, the 100277784