Product Overview

The Hayward FDXLHXA1150 Heat Exchanger Assembly is a genuine OEM replacement heat exchanger designed for compatible Hayward Universal H-Series H150FD 150,000 BTU pool and spa heaters and select 135K H-Series above-ground heater configurations.

The heat exchanger is the primary component responsible for transferring heat from the heater's combustion system into the circulating pool or spa water. Hayward constructs the Universal H-Series heat exchanger from durable cupronickel materials, providing excellent heat transfer and improved resistance to demanding pool-water conditions.

This replacement assembly is ideal when the original heat exchanger has developed leaks, corrosion, freeze damage, severe scaling, or other deterioration that prevents proper heater operation.

Key Features

Genuine Hayward OEM Replacement

Manufactured by Hayward for proper fit and performance in compatible H-Series heater models.

150,000 BTU H150FD Compatibility

Hayward specifically identifies FDXLHXA1150 as the heat exchanger assembly for the H150FD Universal H-Series Low NOx heater.

135K Above-Ground Heater Compatibility

Also listed for compatible 135K H-Series above-ground heater configurations.

Cupronickel Heat Exchanger Construction

Constructed using copper-nickel materials designed to provide efficient heat transfer and increased resistance to pool-water conditions.

Complete Heat Exchanger Assembly

Designed as the replacement heat exchanger assembly rather than an individual tube, gasket, or header service component.

Benefits

• Genuine Hayward OEM replacement
• Fits compatible H150FD heaters
• 150,000 BTU heater application
• Compatible with select 135K above-ground H-Series heaters
• Cupronickel heat exchanger construction
• Restores proper heater heat transfer
• Helps correct leaking or damaged heat exchangers
• Designed for Hayward Universal H-Series Low NOx heaters
• Professional replacement component
• Factory-designed fit and configuration

Specifications

Compatible Heater Models

The FDXLHXA1150 is designed for compatible models including:

• Hayward H150FD Universal H-Series Low NOx
• H150FDN Natural Gas
• H150FDP Propane
• W3H150FDN
• W3H150FDP
• Select Hayward 135K H-Series above-ground heater configurations

Always verify the complete heater model and existing heat exchanger part number before ordering.

Installation Information

Replacing a pool heater heat exchanger requires substantial heater disassembly and should be performed by a qualified pool-heater professional.

Before servicing:

• Turn off electrical power to the heater
• Shut off the gas supply
• Turn off the circulation system
• Allow the heater to cool completely
• Drain water from the heat exchanger
• Relieve all system pressure

Hayward specifically states that installation and service of Universal H-Series heaters should be performed by personnel qualified in pool and spa heater installation.

Important Water Chemistry Notice

Heat exchanger failure is frequently associated with improper water chemistry, insufficient water flow, scaling, corrosion, or freeze damage.

Before installing a new heat exchanger, determine why the original exchanger failed.

Hayward recommends maintaining proper:

• Water flow
• pH
• Total alkalinity
• Calcium hardness
• Sanitizer levels
• Salt concentration

A failed heat exchanger should not simply be replaced without correcting the underlying cause, as the replacement exchanger may also become damaged.

Confirm Before Ordering

Confirm all of the following before purchasing:

• Hayward part number FDXLHXA1150
• Heater model number
• Heater BTU rating
• Existing heat exchanger part number
• H150FD / compatible 135K heater application
• Non-ASME heater configuration

Do not order solely by heater appearance.

Hayward uses different heat exchanger assemblies for each heater size:

• FDXLHXA1150 – 150K
• FDXLHXA1200 – 200K
• FDXLHXA1250 – 250K
• FDXLHXA1300 – 300K
• FDXLHXA1350 – 350K
• FDXLHXA1400 – 400K

Commercial ASME configurations may also require different heat exchanger assemblies.

Warranty Information

This is a genuine Hayward OEM replacement component. Warranty eligibility is subject to Hayward's current replacement-part warranty terms, proper installation, water chemistry, water flow, maintenance, and operating conditions.

Damage caused by freezing, improper chemistry, inadequate circulation, excessive scaling, corrosion, or improper installation may not qualify for manufacturer warranty coverage.

Customer Q&A

Q: What heater does Hayward FDXLHXA1150 fit?

It is the OEM heat exchanger assembly for compatible Hayward H150FD 150,000 BTU Universal H-Series heaters and select 135K H-Series above-ground heater configurations.

Q: Does it fit both natural gas and propane H150FD heaters?

Yes. The heat exchanger is a water-side component and is used with compatible H150FD natural gas and propane configurations.

Q: Is this a genuine Hayward part?

Yes. FDXLHXA1150 is a genuine Hayward OEM replacement heat exchanger assembly.

Q: What material is the heat exchanger?

Hayward identifies the Universal H-Series heat exchanger as being manufactured from copper and nickel, commonly referred to as cupronickel.

Q: Will this fit an H200FD or H250FD?

No. Those heater sizes use different heat exchanger assemblies. The H200FD uses FDXLHXA1200 and the H250FD uses FDXLHXA1250.

Q: What commonly causes a pool heater heat exchanger to fail?

Common causes include improper water chemistry, scale buildup, corrosion, inadequate water flow, freeze damage, or prolonged exposure to highly concentrated pool chemicals.

Q: Should I replace anything else when replacing the heat exchanger?

Inspect the headers, O-rings, bypass components, temperature sensors, pressure switch connections, and surrounding heater components during replacement. Any damaged components should be replaced before returning the heater to service.