Lochinvar & A.O. Smith 100074382 Filter

Maintain peak efficiency in high-performance water heating systems with the Lochinvar & A.O. Smith 100074382 Water Inlet Filter. This genuine OEM replacement part is engineered to meet A.O. Smith factory specifications, providing critical primary filtration for tankless water heaters and commercial boilers. Its high-grade mesh construction effectively captures scale, sediment, and abrasive particulates from the incoming supply, preventing internal clogging and protecting the flow sensor and heat exchanger from premature wear.

Designed for professional-grade reliability, the 100074382 ensures a localized, precise fit that third-party alternatives often fail to match. Regular replacement of this inline water filter is a standard preventative maintenance step—especially in areas with high mineral content—to sustain optimal GPM flow rates and prevent service lockouts. This authentic part replaces legacy numbers EKK2C and 319143-198, offering a direct OEM HVAC replacement filter solution for Lochinvar Knight and various A.O. Smith tankless models. Each unit is supplied new in original factory packaging to ensure component integrity for immediate field installation.

Key Benefits & Technical Specs

• Direct OEM Compatibility: Precise replacement for part numbers 100074382, EKK2C, and 319143-198 across Lochinvar and A.O. Smith platforms.
• System Protection: Captures debris before it enters the heat exchanger or damages the flow adjustment valve.
• Optimized Flow: Designed to maintain factory-specified GPM rates while providing superior water inlet filtration.
• Durable Construction: Built with corrosion-resistant materials and high-integrity seals for high-pressure residential and commercial applications.
• Technical Fit: Measures approximately 1.45 x 1.75 x 1.4 inches for an exact seat in the filter plug assembly.

Common Questions

Which models are compatible with this water inlet filter?
This part is commonly used with residential and commercial tankless units, including the TK-510U, TK-310C, and TK-110 series, as well as select Lochinvar Knight and Noble cooling/heating systems. Always verify with your specific model number.

How do I know when the filter needs cleaning or replacement?
Contractors should inspect the filter if the owner reports a sudden drop in hot water flow or pressure. Visual inspection of the mesh for scale buildup or debris saturation is recommended during annual tankless water heater maintenance.

Does this filter include the O-ring or filter plug?
This SKU (100074382) typically covers the replacement filter element itself. If the filter plug (100074381) or P15 FKM O-ring (100076307) shows signs of wear or compression set, those should be ordered separately to ensure a leak-free seal.

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.