Lochinvar & A.O. Smith 100109781 Thermostat

The Lochinvar & A.O. Smith 100109781 Propane Gas Thermostat is a critical replacement Intellivent gas control valve engineered specifically for high-efficiency LP water heating systems. Designed for technical precision, this 100109781 gas thermostat maintains a strict 10.0" W.C. manifold pressure setting to ensure optimal combustion and thermal stability in residential and commercial propane applications. As an OEM component, it features integrated 100% gas shutoff safety protocols that engage immediately upon pilot failure, preventing hazardous gas accumulation. This unit facilitates precise 120V electronic sequencing, supporting maximum operating temperatures up to 160°F. A direct fit for select FPD/FPSH and GPSH-40/50 Series 103 models, it simplifies field installation for contractors handling pressurized propane systems. Professionals depend on this LP liquid propane thermostat for its reliable sensing bulb response and rugged internal diaphragm, which mitigate overheating and provide consistent delivery of hot water while maximizing fuel efficiency across the heating cycle.

Key Benefits

• Exact OEM Compatibility: Direct replacement for A.O. Smith and Lochinvar units, ensuring seamless fitment with 100109781 specifications.
• Enhanced Safety Logic: Features 100% gas shutoff protection and safe-lighting protocols to prevent main gas flow during pilot ignition.
• Industrial Grade Precision: Calibrated for 10.0" W.C. manifold pressure to maintain strict propane combustion standards.
• Durable Thermal Management: Rated for temperatures up to 160°F, preventing system cycling issues and ensuring thermal consistency.
• Advanced Intellivent Control: Optimized for 120V systems, providing responsive temperature regulation for high-demand propane heaters.

Common Questions

How do I confirm if this gas valve fits my specific water heater model?
This part is explicitly designed for propane (LP) systems. Verify your water heater's serial and model numbers; this unit is typically found in Lochinvar and A.O. Smith GPSH and FPD/FPSH series. Using a 100109781 thermostat on a natural gas system is prohibited and unsafe due to the 10.0" W.C. pressure calibration.

Does this unit require manual reset if the pilot goes out?
The 100109781 Intellivent control manages gas flow electronically. While the valve itself does not have a manual pilot reset button, certain water heaters may be equipped with an external thermal switch that requires a manual reset depending on the specific heater configuration.

Can I use a 100109781 to replace a natural gas thermostat?
No. This component is strictly for liquid propane (LP) applications. Installing a propane-calibrated valve on a natural gas line will lead to improper burner pressure and hazardous operation.

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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.