Lochinvar & A.O. Smith 100027491 Orifice

The Lochinvar & A.O. Smith 100027491 Orifice is a high-precision gas burner component engineered for specific water heating and pool heater applications. Featuring a 1/2" HEX RH (Right Hand) design, this direct replacement orifice ensures calibrated fuel-to-air ratios for optimal combustion efficiency. This part serves as the current manufacturer-authorized update for the legacy 076243-030 part number, maintaining the exact tolerances required for pressurized gas trains. As a veteran-grade HVACR replacement part, it is designed to withstand the thermal stress of continuous operation while preventing common issues such as irregular flame patterns or soot accumulation. Whether you are performing a seasonal tune-up or a critical repair, utilizing this OEM gas orifice ensures the equipment operates within the specific BTU parameters defined by the original engineering schematics. Always verify the orifice drill size and gas type (Natural Gas or Liquid Propane) against the unit’s rating plate to confirm a match for this 100027491 combustion part.

Key Benefits:

• Precise Fuel Regulation: Machined with a 1/2 inch hex head for secure threading into the manifold, ensuring leak-free performance.
• OEM Compatibility: Seamlessly replaces the discontinued 076243-030 without the need for additional gas train modifications.
• Enhanced Thermal Stability: Built from high-quality brass to resist corrosion and nozzle clogging in high-heat environments.
• Optimized Burner Performance: Maintains consistent gas flow velocity to support stable pilot and main burner ignition.

Common Questions:

Is the 100027491 a direct fit for the 076243-030?
Yes, this is the official updated version. It maintains the same 1/2" HEX RH dimensions and threading for a drop-in installation on compatible gas assemblies.

Which systems use this specific orifice?
This part is commonly found in Lochinvar and A.O. Smith commercial water heaters and residential pool heaters, such as the EnergyRite series, depending on the gas configuration.

Can I use this for a Propane-to-Natural Gas conversion?
Orifices are sized specifically for the gas type and BTU load. You must consult the manufacturer’s conversion kit instructions to ensure this specific orifice diameter matches your altitude and gas requirements.

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.