Hayward FDXLHXA1200 Heat Exchanger Assembly for Universal H-Series Low NOx H200FD (200K BTU)

The Hayward FDXLHXA1200 is a genuine OEM heat exchanger assembly built for the Universal H-Series Low NOx H200FD pool heater platform. This is the primary heat-transfer component inside the heater that moves heat from the combustion chamber into the pool water. It’s commonly replaced when the exchanger is leaking, restricted by scale/debris, or damaged from freeze events or long-term corrosion.

Fits / Compatibility

• Hayward Universal H-Series Low NOx H200FDN (Natural Gas) heaters
• Hayward Universal H-Series Low NOx H200FDP (Propane) heaters
• BTU class: 200,000 BTU (H200FD)

Fit tip: Confirm your heater model on the data plate (H200FDN or H200FDP) and match the parts diagram for your heater revision before ordering.

Common Reasons to Replace

• Water dripping/leaking from inside the heater cabinet during circulation or heating
• Reduced heating performance from internal restriction or heavy scale buildup
• Freeze damage (cracked tubes/manifold area) from improper winterization
• Corrosion/pitting caused by aggressive or unbalanced water chemistry

What’s Included

• (1) Complete FDXLHXA1200 heat exchanger assembly

Note: Seals, O-rings, headers/manifolds, and other disturbed hardware may be sold separately depending on your heater’s revision. Inspect and replace any flattened or damaged seals during reassembly.

Installation Notes

• Shut off power and gas to the heater, relieve system pressure, and allow the unit to cool before service.
• Replacing a heat exchanger is a major repair—professional service is strongly recommended.
• If the old exchanger failed from scale or low flow, correct the root cause (filter condition, bypass settings, pump flow, water balance) to prevent repeat damage.
• After installation, inspect carefully for leaks during the first heat cycle.

Specs (Quick Reference)

• Part Number: FDXLHXA1200
• Heater Platform: Universal H-Series Low NOx H200FD
• Approx. Weight: ~33 lb (varies by packaging/shipping configuration)
• UPC (commonly listed): 610377104586

Related Products

• Hayward FDXLHXA1200 (search)
• Hayward H200FDN Parts (search)
• Hayward H200FDP Parts (search)
• Hayward FD Heater Water Pressure Switch (search)
• Hayward FD Heater Thermistor (search)
• Hayward FD Return Manifold/Header Kit (search)
• Hayward FD Heater Union O-Rings & Seals (search)

Maintenance Tips

• Keep filters and pump baskets clean—low flow can overheat heaters and stress exchanger components.
• Maintain balanced water chemistry (especially pH, alkalinity, and calcium hardness) to reduce scaling and corrosion.
• Winterize properly in freeze-prone areas by draining the heater completely to prevent cracked exchangers.
• If you see mineral trails or dampness under the heater, address it early—small leaks can become major damage quickly.