Lochinvar & A.O. Smith 100109690 Thermostat

The Lochinvar & A.O. Smith 100109690 Natural Gas Thermostat is a precision-engineered OEM replacement part designed for high-performance residential and commercial gas-fired water heaters and boilers. This natural gas thermostat kit, also identified under part numbers 9004102205 and 100109690, is built to restore accurate thermal regulation and ensure the safe operation of your heating system. Utilizing advanced sensing technology, this replacement gas control valve monitors water temperatures in real-time, adjusting gas flow to maintain precise setpoints. It is specifically compatible with Lochinvar CGN075-75 and CGN075-100 models, as well as A.O. Smith BT80-112 units. With a 4.0" W.C. setting and a 181°F temperature limit, this HVAC repair part prevents unsafe appliance behavior while optimizing energy conservation. As a veteran-preferred natural gas thermostat insert, it offers a reliable solution for contractors looking to minimize downtime and avoid the risks associated with generic, non-OEM components.

• Ensures precise temperature control to prevent thermal stacking and overheating in natural gas systems.
• Meets strict OEM specifications for seamless fitment in Lochinvar and A.O. Smith boilers.
• Includes advanced sensing technology to improve energy efficiency and reduce operational costs.
• Engineered as a direct 100109690 kit replacement, including the gas control valve and necessary thermostat components.
• Supports safe operation by maintaining regulated gas flow and accurate water temperature monitoring.

Is the 100109690 compatible with propane heaters?
No, this specific model is a natural gas thermostat only. For liquid propane (LP) units, a different part number is required to ensure correct pressure regulation.

Can I use this to replace part number 9004102205?
Yes, the 100109690 is the direct OEM replacement for the older 9004102205 part number commonly found in A.O. Smith and Lochinvar documentation.

Does this kit include the gas control valve?
Yes, this is an integrated gas control and thermostat kit designed to regulate both the burner ignition and the temperature setpoint.

California Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer and reproductive harm.

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.