Always cross-reference the model number on the unit's data plate

maintaining critical flame stability and heat exchanger efficiency

This solenoid-operated drain is built to withstand demanding HVACR and industrial environments

If the board is functional

Lochinvar & A.O. Smith 100265707 Burner Assembly 320788-704 Always cross-reference the model numberWhen you're dealing with a natural gas water heater that isn't maintaining consistent flame or efficient heat transfer, the Lochinvar & A. O. Smith 100265707 Burner Assembly is the exact OEM solution required for field restoration. This FBA N3 G40S40 NAT AL EXT assembly kit is specifically engineered for 18 inch diameter tanks, providing a precise fit for G40S40 models across the Lochinvar, A. O. Smith, State, and American Water Heater catalogs. As an