Lochinvar & A.O. Smith 100108803 Heating Element

The Lochinvar & A.O. Smith 100108803 Heating Element is a heavy-duty, screw-in water heater element designed for high-demand commercial and residential applications. Operating at 240V and 4500W, this Incoloy heating element provides superior resistance to lime scale buildup and dry-firing compared to standard copper alternatives. With an immersion length of 12-3/16 inches, it ensures efficient thermal transfer within the tank. This component serves as a direct replacement for various Lochinvar replacement parts and A.O. Smith models, maintaining the original equipment manufacturer (OEM) specifications for wattage density and sheath material. For service technicians, the 1-inch NPSM threading ensures a secure, leak-free fit during installation. Whether you are performing routine maintenance or a critical repair, using this 4500 watt 240 volt element ensures the water heater maintains its recovery rate and operational efficiency under high-cycle conditions.

Technical Specifications & Key Benefits

• High-Grade Incoloy Sheath: Engineered to withstand high temperatures and corrosive water conditions, extending the service life of the water heater repair part.
• Universal Compatibility: Fits a wide range of A.O. Smith and Lochinvar commercial electric water heaters requiring a 12-3/16 inch immersion length.
• Optimized Heat Transfer: The 4500W output is calibrated for rapid recovery times in commercial water heater maintenance.
• Easy Installation: Standard 1-inch screw-in hex head allows for straightforward removal and replacement with a standard element wrench.

Common Service Questions

What causes a heating element to burnout prematurely?
Dry-firing is the most common cause, occurring when power is applied before the tank is completely full. Scale accumulation can also insulate the element, causing it to overheat and fail.

Can I use this 4500W element in a tank originally rated for 3800W?
It is critical to match the nameplate voltage and wattage. Increasing wattage can overload the internal wiring, thermostats, and circuit breakers, creating a fire hazard.

How do I test if the 100108803 element is functioning?
With power disconnected, use a multimeter to check for continuity. A reading of infinity indicates a broken internal filament, requiring immediate replacement.

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.