Lochinvar & A.O. Smith 100133618 Pump

The Lochinvar and A.O. Smith 100133618 is a heavy-duty 3/4 HP circulator pump engineered for demanding hydronic heating and commercial water heating applications. Specifically designed for high-head requirements, this centrifugal pump maintains consistent flow rates across complex piping geometries, ensuring optimal heat transfer within the heat exchanger. This OEM replacement pump is a direct fit for various Lochinvar Knight and Copper-Fin models, as well as A.O. Smith Cyclone and Burkay series water heaters. Built with a robust motor and precision-machined impeller, the 100133618 handles high-temperature fluid circulation while minimizing cavitation risk. For contractors performing boiler pump replacement or system maintenance, this 115V single-phase unit provides the reliable hydraulic performance necessary to meet GPM specifications. Integrating a genuine hydronic heating pump ensures exact electrical and physical compatibility, reducing labor hours and preventing common integration issues associated with generic aftermarket alternatives.

Key Benefits for Technicians:

• High-Head Performance: Optimized 3/4 HP motor provides the torque needed for large-scale commercial loops.
• Direct OEM Fit: Drop-in compatibility with Lochinvar 100133618 and A.O. Smith 100133618 part numbers ensures correct flange alignment.
• Thermal Efficiency: Designed to maintain peak flow velocities, preventing short-cycling and localized overheating in high-BTU systems.
• Industrial Build Quality: Heavy-duty housing and internals are rated for continuous-duty operation in harsh mechanical room environments.

Common Installation & Selection Questions:

What Lochinvar boiler models use the 100133618 pump?
This pump is commonly utilized in the Lochinvar Knight XL and Copper-Fin II series where a 3/4 HP high-head circulator is specified for the primary or secondary loop.

Is this a direct replacement for older 100133618 part numbers?
Yes, this current part number replaces several legacy A.O. Smith commercial pump numbers and Lochinvar equivalents, maintaining identical mounting and electrical specs.

Does this unit require a specific flange kit for installation?
Installation typically utilizes standard commercial flanges; however, you should inspect existing gaskets and bolts for wear when replacing the circulator pump motor assembly.

This item must ship via truck. Please contact us for freight quote.

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.