Lochinvar & A.O. Smith 100304360 Assembly

The Lochinvar & A.O. Smith 100304360 is a high-performance Manifold Door Assembly engineered for natural gas applications. This critical OEM component serves as the direct replacement for 100093803, ensuring seamless integration and returning your water heater to factory specifications. This 18-inch low NOx burner assembly features a 3.75-inch extension and a 450D temperature control profile, optimized for precise combustion and thermal regulation in BFG40S RS and compatible residential or commercial models. As a veteran-grade HVAC replacement part, it is designed with a corrosion-resistant manifold and a pre-installed gasket on the door for a verified airtight seal, preventing hazardous gas leaks and improving overall combustion efficiency.

• OEM Compatibility: Specifically designed as the 100% direct replacement for 100093803, eliminating the need for field modifications.
• Combustion Efficiency: Features a natural gas burner assembly tuned for low NOx emissions and consistent 450-degree thermal thresholds.
• Durable Construction: The 18-inch manifold door is fabricated from heavy-duty steel to withstand high-temperature industrial environments.
• Safe Installation: Includes the 3.75-inch EXT tube and integrated thermal components (450D TC) for reliable pilot and main burner ignition.

Is 100304360 compatible with my older 100093803 unit?
Yes, this part is the manufacturer-designated successor. It is a drop-in replacement that meets or exceeds the specifications of the original A.O. Smith 100093803.

Does this assembly work for Propane (LP) units?
No, the 100304360 is strictly for Natural Gas burner assembly applications. Conversion between fuel types requires a specific conversion kit, not just a manifold swap.

What is the purpose of the 450D TC designation?
This refers to the thermal cutoff temperature (450 degrees), which is a safety mechanism designed to interrupt the gas supply if internal temperatures exceed safe operating limits, protecting the vessel from dry-fire or overheating.

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.