Lennox 78A25 Pilot Orifice

The Lennox 78A25 is a critical component for technicians performing LP gas conversions or servicing pilot assemblies in residential heating units. This LP pilot orifice is precision-engineered to meter gas flow with technical accuracy, ensuring a stable pilot flame for reliable ignition cycles. Primarily designed for LP/Propane configurations, the 78A25 is a direct factory replacement and is technically identical to the Lennox 78A2501 part number. Field-testing confirms compatibility with a wide range of legacy and modern units, including the Lennox G11 and Lennox G12 series furnaces. Utilizing the correct pilot orifice is essential for maintaining manifold pressure specifications and preventing carbon buildup or ignition failure. For contractors managing inventory, this HVAC replacement part ensures OEM-level fitment in gas valve assemblies and burner systems, maintaining the equipment's original design integrity without the need for field modifications.

• Precise Gas Metering: Calibrated specifically for Liquid Propane (LP) to ensure proper BTU input and flame stability.
• OEM Compatibility: Guaranteed fit for Lennox G11, G11D2E, G11E, and G12 series units.
• Interchangeable Design: Full functional equivalence with Lennox 78A2501 for simplified sourcing.
• Reliable Ignition: Reduces service call-backs by eliminating pilot outages caused by worn or clogged orifices.

• Is the 78A25 compatible with Natural Gas? No, this orifice is specifically sized for LP/Propane; using it with Natural Gas will result in improper combustion.
• Can I use 78A2501 instead? Yes, these two part numbers refer to the same physical component and are interchangeable.
• Which Lennox series does this fit? It is widely used in G11 and G12 series furnaces, along with various gas valve burner assemblies.

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.