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Bard part number 9043-209 is an OEM NOx burner used on Bard ISG gas heating models, designed to deliver stable burner flame characteristics that support clean, consistent combustion and reliable heat output. If your ISG unit has burner-related issues like uneven flame, delayed ignition, or poor heat performance, replacing the burner with the correct Bard OEM component helps restore proper operation and maintains the unit’s original combustion setup. Confirm compatibility by matching your ISG model and existing burner configuration before ordering, since ISG equipment may use specific burner styles and mounting details that must align exactly for safe, correct fit.