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Bard 171-167 is an OEM heat exchanger assembly used in Bard wall mounted gas/electric HVAC units to transfer heat safely from the burner section into the airstream while keeping combustion gases isolated from supply air. A worn or cracked heat exchanger can lead to poor heating performance and nuisance limit trips, so replacing it with the correct Bard factory part helps restore proper heat output, airflow temperature rise, and reliable operation. Confirm the exact unit model and heating capacity from the Bard parts list for your specific WG or W-series wall mount before ordering to ensure proper fit with the matching burner and collector box components.