Lochinvar & A.O. Smith 100108291 Heating Element

The Lochinvar & A.O. Smith 100108291 is a professional-grade 4500W 240V 12" heating element designed for high-performance thermal transfer in commercial and residential electric water heaters. As a standard screw-in water heater element, it features a robust 1-inch NPSM thread pattern, making it a versatile OEM replacement part for multiple brands, including State, Reliance, and American Water Heaters. This copper sheath heating element is engineered for durability, utilizing a low watt density design that reduces surface temperature and minimizes mineral scale buildup, which is critical for extending the service life of the tank in hard water conditions. Whether you are performing routine maintenance or a 24/7 emergency repair, this 100108291 element provides the rapid recovery rates and reliable wattage output required by modern plumbing systems. It serves as a direct upgrade or replacement for legacy part numbers 100108290 and 9000095045, ensuring seamless mechanical and electrical compatibility during installation.

• Universal Compatibility: Fits a broad range of A.O. Smith, Lochinvar, State, and Reliance electric water heaters.
• Enhanced Durability: The copper construction provides superior heat conductivity and corrosion resistance.
• Reduced Scaling: Low watt density (LWD) design prevents sediment "dry-firing" and increases component longevity.
• Complete Assembly: Includes a high-temp gasket to ensure a watertight seal and prevent post-installation leaks.
• Precision Specs: Rated at 4500 Watts at 240 Volts with a standard 12-inch immersion length.

Can I use this element in a 208V system?
While it will physically fit, a 240V element operated at 208V will produce significantly less heat (approximately 3380W), leading to slower recovery times. Always match the voltage rating on the heater's nameplate.

What causes these elements to burn out prematurely?
The most common cause is "dry-firing," where the power is turned on before the tank is completely full of water. High mineral content in the water can also cause scale buildup, which is why this low watt density model is preferred for its resistance to localized overheating.

Is a special tool required for installation?
A standard 1-1/2 inch element socket is recommended to ensure the hex head is not stripped and that the 100108291 is torqued correctly against the gasket.

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.