Hayward H400FD Heat Exchanger Assembly | FDXLHXA1400

The OEM Hayward Heat Exchanger Assembly (FDXLHXA1400) is the direct replacement for Hayward H400FD Universal H-Series Low NOx pool heaters. If your heater is leaking water, losing heat output, or failing to maintain temperature, a cracked or corroded heat exchanger is the most common cause.

This factory-original exchanger is engineered to restore proper heat transfer, eliminate internal leaks, and return your heater to full 400,000 BTU performance. Built with corrosion-resistant tubing for harsh pool environments, it’s designed for long-term reliability in both residential and high-demand pools.

Whether you’re fixing a dripping heater, solving poor heating performance, or completing preventative maintenance, this OEM assembly ensures exact fitment and dependable operation for your H400FD heater.

• Optimizes Heater Performance: Specifically designed for H400FD heaters, ensuring efficient heat transfer to enhance performance and energy efficiency.
• Durable Construction: Made with robust materials to withstand the rigors of pool environments, providing reliable, long-term operation.
• Essential Component: Crucial for maintaining the effectiveness and longevity of your H400FD heater, vital for both routine maintenance and needed repairs.
• Enhances Efficiency: Ensures optimal heater efficiency by maximizing heat transfer, leading to better energy usage.
• Reliable Operation: Built for durability and dependability, this heat exchanger assembly supports consistent and effective heater functionality.

• Hayward Universal H-Series Low NOx Pool Heater

• Model H400FD

• Natural Gas and Propane versions

• Residential and commercial installations

Common Problems This Heat Exchanger Fixes

• Water dripping from inside the heater cabinet

• Internal heat exchanger leaks

• Poor or inconsistent pool heating

• Heater running but not reaching set temperature

• Reduced efficiency in H400FD Low NOx heaters

What’s Included

• OEM Hayward heat exchanger core (FDXLHXA1400)

• Required gaskets and mounting hardware

• Factory-assembled, ready for installation

Build Quality & Performance

• Rated for 400,000 BTU H-Series Low NOx heaters

• Corrosion-resistant tubing for pool environments

• Designed for continuous, high-demand operation

• Restores proper heat transfer and energy efficiency

Frequently Asked Questions

Will this heat exchanger fix a leaking H400FD heater?
Yes. Internal leaks and dripping water are most commonly caused by a cracked or corroded heat exchanger in H400FD heaters.

Does FDXLHXA1400 fit 2023 H400FD models?
Yes, as long as the heater model is H400FD. Production year does not affect compatibility.

Is this an OEM Hayward part?
Yes. This is a genuine OEM replacement manufactured to Hayward specifications.

Will this work with propane heaters?
Yes. This exchanger is compatible with both natural gas and propane H400FD units.