Find your parts diagram
Sticker on the pump body (the part with the basket), not on the motor. Motor labels from Century, A.O. Smith or Regal won't match parts.
Label on the side of the tank near the base. Size is in sq ft, e.g. 420 sq ft = C4030 or CCP420.
Rating plate inside the front access panel. Note the BTU and gas type (NG or LP).
Molded into the body or printed on top. Robotic cleaners: on the power supply.
Still not sure? Call (818) 818-6559 and we'll find it for you.
OEM Hayward Heat Exchanger Assembly FDXLHXA1250 is a factory replacement part designed for the Hayward Universal H-Series Low NOx pool heater model H250FD. This essential component transfers heat efficiently to pool water while supporting clean air compliance with low NOx emission standards. Constructed from high-quality, corrosion-resistant materials, it delivers consistent heating performance and long-term durability. As a genuine Hayward part, the FDXLHXA1250 ensures precise fitment and reliable system operation in demanding pool environments.
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Made for H250FD Models: Designed to fit Hayward H-Series Low NOx H250FD pool heaters for guaranteed compatibility and performance
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Maintains Energy Efficiency: Enables efficient heat transfer to help maintain stable water temperature and reduce energy waste
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Low NOx Compliant: Supports eco-friendly operation by meeting strict emissions regulations for pool heaters
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Rugged and Corrosion-Resistant: Built from durable materials engineered to withstand poolside heat, moisture, and chemical exposure
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Restores Heater Functionality: Plays a central role in ensuring consistent and effective heater operation throughout the season
- Hayward H-Series H250FD Heaters

