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The Bard 8604-103 heat strip is an OEM electric resistance heater rated 4.8 kW at 240V single phase, designed to add or restore supplemental heat in compatible Bard wall-mount and packaged HVAC units. This part is commonly used to support heating during cold weather, defrost, or high demand conditions when heat pump output alone is not enough, helping maintain steady indoor comfort while the blower distributes warmed air across the space. Because electric heat kits must match the unit’s electrical and heater compatibility requirements, confirm the exact 8604-103 part number and your model’s heater kit callout before ordering to ensure proper fit, wiring, and safe operation.