the 100111369 is specifically calibrated for natural gas (NG) applications

220741A2-62 is identical to 220741A2-62/U

which requires a replacement to prevent delayed ignition or "booming

Key Benefits Precise OEM Compatibility: Engineered as a direct Lennox 78F9201 replacement to ensure exact shaft alignment and electrical lead integration

verify the 115V rating and lead protection requirements for your specific installation site

Lochinvar & A.O. Smith 100111921 Relief Valve 323269-701 the 100111369 is specifically calibratedThe Lochinvar and A. O. Smith 100111921 Relief Valve is a critical safety component designed for high efficiency commercial boilers and water heaters. Engineered to meet strict ASME Section IV requirements, this pressure relief valve protects the heat exchanger and plumbing system from over pressurization by opening at its specific factory set PSI. This genuine OEM replacement part replaces older part numbers including 100111921 and RLVAL2409,