Hayward FDXLHXA1250 Heat Exchanger Assembly – Fits H250FD Universal H-Series Low NOx

Part # FDXLHXA1250 — a genuine Hayward heat exchanger assembly designed for use in H250FD series heaters in the Universal H-Series Low NOx lineup. This component restores proper heat transfer and performance in a pool heater when the existing exchanger has failed, leaked or become corroded.

Key Features

Factory original Hayward heat exchanger assembly for H250FD Universal H-Series Low NOx pool and spa heaters.
Tray/tube design engineered to deliver efficient heat transfer while maintaining durability in heater water loops.
Designed to withstand prolonged exposure to pool water, back-wash cycles and the chemical/thermal demands of a heater application.
Full drop-in replacement: simplifies servicing by maintaining correct plumbing connections, mounting, and performance specifications.
Helps restore heater to manufacturer performance specifications, improving heating speed and system reliability.

Typical Applications

This heat exchanger assembly is used when your heater begins showing signs of heat transfer failure—such as slow heating, increased burner or pump runtimes, low outlet water temperature, visible corrosion or pinholes in the exchanger. It is ideal for service technicians or pool owners refurbishing the H250FD Universal H-Series heater to full operational condition.

Installation & Compatibility Notes

Before beginning installation, turn off power to the heater, allow it to cool, and shut off water flow. Drain the heater water side or isolate plumbing per manufacturer instructions. Remove the front cover and access the heat exchanger area — disconnect any unions or plumbing connections, remove the old exchanger assembly and install the FDXLHXA1250 in its place. Re-connect all plumbing, inspect gasket/seals, refill the heater water side, purge air, restore power, and verify proper operation and temperature rise under load.

Why Choose This Heat Exchanger?

Choosing the Hayward FDXLHXA1250 ensures you get a compatible OEM part that matches the original heater design, maintains performance, and reduces the risk of premature failure. Using a correct replacement helps avoid mismatch issues, ensures warranty alignment, and supports optimal heater life and efficiency.

Maintenance Tips

Inspect the exchanger annually for signs of corrosion, leaks, or scaling on the water-side tubes.
Ensure proper water chemistry and filter cleanliness to reduce sediment or scale buildup in the exchanger, which can degrade performance.
After installation, monitor the heater’s temperature rise and runtime to confirm the exchanger is performing correctly.
During off-season or long idle periods, protect the heater from freeze and confirm no residual water remains in the exchanger to prevent damage.

Questions about returns? View our return policy.

Hours Of Operation:

Monday - Friday: 7:00 am to 5:00 pm Phoenix Time

Saturday: 8:00 am to 2:00 pm

Sunday: Closed

We do not ship on Saturday or Sunday.
Orders totaling more than $300 will require signature confirmation upon delivery.
We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
Expedited shipping options are available at checkout.

Return Policy:

Products that are received damaged will receive a refund in store credit.
Most products are eligible for return within 30 days of receipt, except where noted below.
To initiate a return, please complete an RMA form prior to sending your item back.
Original shipping costs are non-refundable and will be deducted from the return credit.
Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
Some returns will be charged an automatic 15% restocking fee.
We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
Please complete the return form to receive your RMA number and return shipping label.
Chemical products are not eligible for return under any circumstances.
The Pentair Colorsync 618031 is not eligible for return.
Pool cleaners are not eligible for return.
Opened seals and o-rings are not eligible for return.
Capacitors are not eligible for return.
Plastic popup tools are not eligible for return.
Automation components and circuit boards are not eligible for return.
If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.