Lochinvar & A.O. Smith 100110026 Gas Thermostat

When you're out on a call for a residential or light commercial water heater that is failing to maintain setpoint or won't fire at all, a faulty natural gas thermostat is often the culprit. The Lochinvar & A.O. Smith 100110026 is the heavy-duty service replacement you need to get the system back online. This is an authentic OEM gas control valve manufactured by White Rodgers (37C73U-268), engineered specifically for FVIR (Flammable Vapor Ignition Resistant) compliant water heaters. It features a precise manifold pressure setting of 3.5" W.C. and a fixed pilot pressure with an 195°F E.C.O. (Energy Cut Off) for maximum safety.

The 1-1/4" shank length ensures a proper fit into the tank, while the integrated internal thermostat provides consistent temperature regulation up to 160°F. This unit replaces legacy part numbers 9004703105, 182791-000, and 100042353. For technicians, the installation is straightforward: the gas inlet is designed for a standard pipe nipple to assist with leverage during removal and replacement. Always verify your water heater temperature control requirements and gas type before installation to ensure HVAC replacement part compatibility.

• Direct OEM Replacement: Replaces A.O. Smith 100110026 and Lochinvar equivalents with exact factory specs.
• Advanced Safety: Features an Energy Cut Off (E.C.O.) trip point of 195°F to prevent overheating.
• Precise Regulation: Factory-set 3.5" manifold pressure for stable natural gas water heater operation.
• Durable Construction: Built by White Rodgers to handle the cycling demands of residential and commercial environments.
• Standard Fitment: 1-1/4" shank and standard threading for quick "one-call" field service.

What takes place if the E.C.O. trips on this valve?
The Energy Cut Off is a non-resettable safety feature. If the water temperature exceeds 195°F, the valve will permanently interrupt gas flow to the burner and pilot to prevent a tank rupture. If this occurs, the entire gas thermostat valve must be replaced.

Is this compatible with Propane (LP) systems?
No, this specific model is calibrated for natural gas only. Using this on a propane system is dangerous due to the differences in manifold pressure and orifice requirements.

How do I ensure a leak-free installation?
Always use a professional-grade pipe joint compound on the gas inlet threads and perform a bubble test on all junctions using a non-corrosive leak detection solution before leaving the job site.

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.