Lochinvar & A.O. Smith 100166408 Pump

The Lochinvar & A.O. Smith 100166408 Pump is a critical OEM replacement circulator engineered for high-performance hydronic systems. This E22.2B series pump, identical to the PUM30003, features a 2/5 HP motor and a durable bronze pump body, making it ideal for potable water heating and condensing water heater applications where corrosion resistance is non-negotiable. Designed specifically for Lochinvar Armor AW 501-601 and WA series models, it delivers a maximum flow rate of 53 GPM to ensure efficient heat transfer across the heat exchanger. The single-phase 120V motor utilizes a stainless steel shaft and permanently lubricated bearings to minimize maintenance requirements for technicians. This centrifugal circulator pump is a direct drop-in for Armstrong E22.2B models, featuring standard 2-inch flange connections. By maintaining proper GPM flow rates, this pump prevents short-cycling and ensures the long-term reliability of commercial and residential hydronic heating systems.

• Bronze Housing: Naturally lead-free and corrosion-resistant, perfect for open-loop domestic hot water systems.
• High-Flow Performance: Capable of moving up to 53 GPM, specifically calibrated for Armor AW series high-efficiency boilers.
• Drop-in Compatibility: Exact cross-reference for PUM30003 and Armstrong 182212-668, ensuring no piping modifications are needed.
• Maintenance-Free Design: Features permanently lubricated bearings and a bellows-style mechanical seal for quiet, reliable operation.
• Optimized Efficiency: 2/5 HP motor provides the necessary head pressure for radiant heating and snow-melt installations.

Is the 100166408 compatible with glycol-based systems?
Yes, the Armstrong E22.2B design is rated for both water and glycol circulating solutions typically used in radiant or outdoor snow-melting loops.

Does this pump require external power or does it pull from the boiler board?
This 120V circulator typically requires a dedicated power supply or connection via a high-voltage relay; verify your specific boiler’s wiring schematic for its line voltage terminal configuration.

Can I use a cast iron version instead of this bronze model?
No. For potable water or open heating systems, a bronze pump body is required by code to prevent rust and ensure water safety. Cast iron is reserved for closed-loop systems only.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.