Description
Lochinvar & A.O. Smith 100265708 — K FBA N3 G40S40 LP AL EXT Kit
This OEM replacement kit from Lochinvar & A.O. Smith is engineered specifically for the G40S40 series liquid propane (LP) water heaters. Designed to maintain proper flue gas flow and combustion efficiency, this flue baffle assembly kit ensures your water heater operates at peak performance and within manufacturer specifications.
Product Overview
The 100265708 kit is a direct factory replacement component, providing a precise fit for the N3 series G40S40 LP water heater models. Whether you’re performing routine maintenance or restoring a unit to full operating condition, this kit delivers the reliability and quality you expect from one of the industry’s most trusted water heater brands.
Key Features
- OEM Lochinvar & A.O. Smith replacement kit — guaranteed compatibility
- Designed for G40S40 series liquid propane (LP) water heaters
- Flue baffle assembly (FBA) supports optimal combustion and heat transfer efficiency
- Aluminum (AL) construction for durability and corrosion resistance
- N3 series specific fit — no modifications required
- EXT designation for external or extended application compatibility
- Helps restore manufacturer-rated efficiency and performance
Application
- Compatible Model Series: G40S40 LP (Liquid Propane)
- Series: N3
- Fuel Type: Liquid Propane (LP)
- Material: Aluminum (AL)
- Kit Type: Flue Baffle Assembly (FBA)
Why Choose OEM Parts?
Using genuine Lochinvar & A.O. Smith replacement parts ensures your water heater maintains warranty compliance, operates safely, and delivers the energy efficiency it was designed for. Aftermarket substitutes may compromise performance and void manufacturer warranties.







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