This specific unit is rated for 115V AC operation

the control board will prevent the gas valve from opening for safety

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

The brass construction is machined for high-heat durability and consistent gas delivery across the burner profile

Positive-Off Safety: Includes a dedicated positive-off switch to ensure absolute system shutdown during maintenance

Lochinvar & A.O. Smith 100277784 Impeller 326058-755 This specific unit is 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