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Bard 171-258BX - Heat Exchanger Assembly 90K

The Bard 171-258BX is an OEM heat exchanger assembly rated for 90,000 BTU used in Bard gas heating sections on select wall mounted HVAC and packaged units. This component is the core of the furnace heat transfer process, separating combustion gases from the supply air stream so the unit can deliver steady, safe heat when the burner is operating. Replacing a worn or damaged heat exchanger with the correct Bard factory assembly helps restore proper temperature rise, stable ignition and draft performance, and dependable heating operation, but fit is model specific so confirm the unit model and serial or the Bard parts list before ordering Bard 171-258BX.


  • Technical Specifications
  • Product number: 171-258BX
  • Manufacturer description: Heat Exchanger Assy 90K Serivce
  • HTS Code: "8415.90.8085"

  • Previous Versions
  • S171-258 (Obsolete, superseded by 171-258BX)

$1,881.00 *

* Orders less than $50 may incure a minimum order fee.

What does the "BX" suffix mean?

Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.

A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.

Example: 8406-142BX is physically identical to 8406-142.