Lochinvar & A.O. Smith 100133612 Pump

The Lochinvar & A. O. Smith 100133612 Armstrong Pump Complete is a high-performance 1/4 HP circulator pump designed for demanding commercial and residential hydronic heating systems. This cast iron circulator pump features 2-inch flanged connections and is the direct OEM replacement for Copper-Fin II models, including CW(N/L) 495-745 and CF(N/L) 401-751, as well as Efficiency+ systems. Operating on a standard 115V, 5.8A power supply, this assembly includes the Armstrong LS45 series components—specifically the motor, coupler, seal bearing assembly, and impeller—to ensure a full system restoration. Built for durability, the 100133612 manages high flow rates up to 55 GPM with a maximum head of 12.5 feet. This HVAC replacement pump is precision-engineered to maintain optimal flow requirements in copper-fin water heaters and boilers, replacing legacy part numbers 100170113, ARM3044PBF, and TP44PBF. For contractors prioritizing uptime, this genuine OEM Lochinvar pump provides a drop-in solution for maintaining system efficiency and temperature control.

• Direct OEM Replacement: Guaranteed fit for Lochinvar Copper-Fin II and Efficiency+ boiler models.
• Industrial-Grade Construction: Heavy-duty cast iron volute and reliable Armstrong motor for long-cycle operation.
• High Distribution Capacity: Capable of delivering up to 55 GPM to meet precise system temperature rise requirements.
• Complete Assembly: Includes volute, gaskets, seal kit, and motor, reducing field Labor and diagnostic time.
• Standardized Infrastructure: Features 2-inch flanged connections for easy integration into existing hydronic piping.

Is this pump compatible with bronze systems?
This 100133612 model features a cast iron body intended for closed-loop heating applications. For domestic potable water systems, the all-bronze 100133610 is typically required.

What components are included in the 'complete' assembly?
The assembly includes the 1/4 HP motor, coupler, bearing module, impeller, seal kit, volute gaskets, and 2-inch flanges with a bolt/gasket kit.

Which Lochinvar models does this 100133612 replace?
It is specifically designed for Copper-Fin II CW and CF models ranging from 401 to 751, as well as Efficiency+ EW 150-300 units.

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.