Hayward FDXLHXA1250 Heat Exchanger Replacement for H250FD — OEM Low-NOx, 2" x 2½" CPVC Unions

Hayward FDXLHXA1250 is the factory-fit heat exchanger assembly engineered to replace the original core in the Hayward Universal H-Series Low NOx pool heater model H250FD.

This direct-replacement heat exchanger restores the thermal core of your Hayward H250FD pool heater without the uncertainty of aftermarket mismatches. Built to the same dimensional and connection specifications as the original part, it keeps your heater operating with the same low-NOx emission profile and plumbing layout. The unit ships at about 48.5 pounds and uses 2" x 2 1/2" CPVC union connections for a straightforward swap into existing plumbing.

How will this heat exchanger fit my H250FD heater?

The FDXLHXA1250 is produced to match the Hayward Universal H-Series Low NOx H250FD physical and plumbing specifications so you can replace the core without modifying the heater housing. It aligns with OEM unions and mounting points for a direct install.

• Specifically for Hayward Universal H-Series Low NOx model H250FD
• 2" x 2 1/2" CPVC union plumbing connections
• Designed to match original mounting and flow orientation

What do the low-NOx features mean for my pool equipment?

This replacement retains the low-NOx design intent of the original H250FD heater, helping the system meet regional air-quality standards where applicable. The part itself is built so the heater continues to operate within those emissions expectations when installed correctly.

• Meets Clean Air Quality Standards as originally specified
• Preserves the heater’s low-emissions performance
• Allows compliance with local NOx regulations when used in appropriate systems

What should I expect during installation and service life handling?

Because the assembly is a like-for-like replacement, most professional technicians can complete the swap without altering plumbing or controls. The 2" x 2 1/2" CPVC unions simplify disconnection and reconnection of water lines; check seals and gaskets during installation to ensure a leak-free fit.

• Weighs approximately 48.5 pounds — plan for two-person handling
• Connects via CPVC unions for easier maintenance access
• Inspect unions and gaskets and follow Hayward torque/installation guidelines

Will this replacement affect performance or warranty?

Using a genuine Hayward replacement assembly helps maintain original performance characteristics because dimensions, materials, and connections are matched to the heater’s design. For warranty impacts, consult Hayward’s warranty policy or your service provider; installing OEM parts is commonly recommended to support warranty claims.

• Restores original heat-exchange path and flow dynamics
• Helps maintain design-level efficiency when properly installed
• Refer to Hayward warranty terms for coverage specifics

Who is this for: Pool service technicians, homeowners, and facilities managers who operate a Hayward Universal H-Series Low NOx H250FD heater and need a reliable, OEM-compatible replacement core. This heat exchanger assembly is aimed at anyone seeking a straightforward swap to restore heater function while keeping the unit within its intended emissions and plumbing specifications. If you’re replacing the original heat exchanger because of corrosion, leaks, or end-of-life degradation, this OEM-style assembly provides the correct fit and connections to get your system back to work with minimal plumbing changes.