Lochinvar & A.O. Smith 100166431 Pump

The Lochinvar & A.O. Smith 100166431 Pump is an essential OEM circulating pump engineered specifically for the AWN285 water heater. As a direct replacement for PUM2011 and PUM3011, this high-performance hydronic circulator ensures consistent flow rates and thermal stability within commercial water heating systems. Constructed with a bronze volute to meet potable water standards, this 2/5 HP motor is designed for the high-demand cycles typical of Lochinvar Armor and A.O. Smith commercial appliances. It maintains the precise GPM flow rate required to prevent stratified temperatures and localized overheating in the heat exchanger. For contractors performing boiler maintenance or urgent HVAC repairs, this unit provides the exact flange-to-flange dimensions and electrical specifications needed for a drop-in installation, eliminating the need for field modifications or re-piping. Its robust impeller design and whisper-quiet operation make it the standard for restoring unit efficiency and reliable hot water delivery.

• OEM Compatibility: Direct replacement pump for PUM2011 and PUM3011, ensuring a perfect fit for the AWN285.
• Corrosion Resistance: Features a bronze body specifically rated for potable water applications and domestic hot water loops.
• Optimized Performance: Engineered to provide the specific head pressure and flow velocity required by high-efficiency water heaters.
• Simplified Service: Designed for an exact match to existing piping configurations, reducing labor time during pump replacement.

What models does the 100166431 replace?
This unit is the manufacturer-authorized direct replacement for part numbers PUM2011 and PUM3011, commonly found in Lochinvar AWN series units.

Is this pump rated for potable water?
Yes, the bronze construction of this circulating pump makes it suitable for open-loop domestic hot water systems where cast iron would succumb to oxidation.

Are the flanges included with the 100166431?
Typically, this replacement pump is sold as the motor and volute assembly; it is professional practice to inspect and reuse existing isolation flanges or replace flange gaskets to ensure a leak-free seal.

This item is not eligible for free shipping.

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.