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Bard part number 5651-018BX is an OEM wraparound crankcase heater used on select Bard wall-mount air conditioners and heat pumps to keep the compressor oil warm during off cycles, reducing refrigerant migration and helping prevent hard starts and premature compressor wear in cooler ambient conditions. This boxed distributor item is a direct-fit Bard replacement intended to restore factory-level protection and reliability when the original heater is open, damaged, or no longer maintaining temperature. Verify compatibility by matching the part number to your unit model and serial, and confirm the heater style and lead connections before ordering.
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.