Lochinvar & A.O. Smith 100108400 Heating Element

For service professionals maintaining Lochinvar or A.O. Smith systems, the 100108400 Heating Element is the reliable OEM standard for high-wattage residential and light commercial water heaters. This 13.5-inch Incoloy element is engineered for 240V systems, delivering a powerful 5500W output to ensure rapid thermal recovery during peak demand periods. The low watt density design utilizes an Incoloy (nickel-iron-chromium alloy) sheath, providing superior resistance to scale buildup and corrosion compared to standard copper elements, making it ideal for hard water applications. As a fold-back screw-in element, it maximizes surface area for efficient heat transfer within the tank. Integrating this genuine A.O. Smith repair part ensures exact fitment and maintains the original system performance specifications. Whether you are performing a routine water heater element replacement or troubleshooting a lost hot water call, this zinc-plated OLOY component provides the durability required for 240V 5500W electric heating configurations across various State, American, and Lochinvar models.

• Incoloy Alloy Sheath: Provides high-grade protection against "dry-firing" and mineral accumulation in hard water environments.
• 5500W Recovery Power: Optimized for high-output 240V circuits to minimize downtime and improve first-hour delivery ratings.
• OEM Compatibility: Precision-engineered for Lochinvar and A.O. Smith tanks, ensuring a leak-free seal and correct electrical resistance.
• Fold-Back Design: Increased surface area reduces the "watt density," which prevents localized overheating and extends the service life of the component.

Is the 100108400 compatible with older 4500W systems?
While the 13.5-inch length and screw-in threads may match, upgrading from 4500W to 5500W requires verifying that the circuit breaker and wire gauge can handle the 22.9-amp draw.

What does 'OLOY' signify for this element?
OLOY refers to the Incoloy material construction, a premium nickel-chromium alloy that resists pitting and stress-corrosion cracking better than standard copper or stainless steel.

How do I test if this element has failed?
A functional 5500W element should typically measure approximately 10.4 ohms when tested with a multimeter across the terminal screws with power disconnected.

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.