Product Overview

The Hayward H-Series H250 Heat Exchanger Assembly | HAXHXA1253 is a genuine OEM replacement heat exchanger designed for select Hayward H250 pool and spa heaters, including compatible Millivolt, ED1, and ED2 H-Series models.

The heat exchanger is the primary component responsible for transferring heat generated by the heater's combustion system into the pool or spa water. A leaking, damaged, corroded, or restricted heat exchanger can cause poor heating performance, water leakage, excessive cycling, or complete heater failure.

The HAXHXA1253 provides a complete OEM replacement solution for compatible H250 heaters and supersedes several earlier Hayward heat-exchanger part numbers.

Ideal For

• Hayward H250 H-Series heater repairs
• H250 Millivolt heaters
• H250 ED1 heaters
• H250 ED2 electronic heaters
• Replacing a leaking heat exchanger
• Replacing a corroded or damaged tube bundle
• Restoring heater efficiency
• Professional pool-heater service and repair

Key Features & Benefits

• Genuine Hayward OEM Replacement – Engineered specifically for compatible Hayward H-Series heaters.
• Designed for H250 Heaters – Correct heat exchanger for compatible 250,000 BTU H-Series configurations.
• Millivolt, ED1 & ED2 Compatibility – Fits multiple generations of the original Hayward H-Series platform.
• Cupro-Nickel Construction – Provides enhanced resistance to pool-water chemistry and corrosion.
• Complete Heat Exchanger Assembly – Replaces the primary water-to-heat transfer assembly.
• 8-Tube Configuration – Four tubes across the upper section and four across the lower section.
• OEM Hydraulic Design – Maintains the water-flow characteristics engineered for the heater.
• Replacement for Older Part Numbers – Supersedes select earlier H250 heat exchanger assemblies.

Specifications

Compatible Hayward Heater Types

The HAXHXA1253 is used with compatible original Hayward H250 H-Series heaters, including:

• H250 Millivolt versions
• H250 ED1
• H250 ED2 electronic models

Important Compatibility Notice

Do not order this heat exchanger based only on the “H250” designation.

Hayward has manufactured several different generations of 250,000 BTU heaters, and they do not all use the same heat exchanger.

HAXHXA1253 is NOT the correct heat exchanger for:

• H250FDN / H250FDP Universal H-Series heaters
• H250IDL / H250IDL2 heater configurations

Those heater families use different heat exchanger assemblies.

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

Superseded / Cross-Reference Part Numbers

The HAXHXA1253 is the current replacement for certain previous Hayward H250 heat exchanger numbers, including:

• HAXHXA1250
• HAXHXA1252
• HAXHEX1250

If your original heater documentation lists one of these older numbers, HAXHXA1253 may be the current OEM replacement.

Model verification is still recommended before purchase.

Why Replace a Pool Heater Heat Exchanger?

The heat exchanger is constantly exposed to heated pool water, chemicals, combustion heat, and changing operating conditions.

Common signs of heat exchanger failure may include:

• Water leaking from inside the heater
• Visible corrosion
• Heater failing to maintain temperature
• Reduced water flow
• Unusual heater cycling
• Scale buildup
• Water appearing beneath the heater cabinet
• Internal tube deterioration

A leaking heat exchanger should be inspected promptly because continued operation can damage additional heater components.

Water Chemistry Matters

Even a high-quality replacement heat exchanger can be damaged by improper pool chemistry.

To maximize service life, maintain pool and spa water within Hayward's recommended chemistry ranges and avoid conditions such as:

• Persistently low pH
• Excessive chlorine concentration
• Improper alkalinity
• Excessive salt or dissolved solids outside equipment specifications
• Chemical feeding directly ahead of the heater
• Poor water circulation

Chemical feeders and chlorination equipment should always be installed according to the heater and sanitation-system manufacturer's instructions.

Installation Guidance

Replacing a pool-heater heat exchanger requires significant heater disassembly and involves:

• Gas-fired heating equipment
• Combustion components
• Water plumbing
• Electrical controls
• High-temperature surfaces

Installation should be performed by a qualified pool-heater technician or licensed professional familiar with Hayward gas pool heaters.

Gas and electrical power should be shut off before servicing.

After installation, the heater should be inspected for proper:

• Water flow
• Gas operation
• Combustion
• Ventilation
• Pressure
• Leaks
• Safety-control operation

Frequently Asked Questions

What heater does HAXHXA1253 fit?
It is designed for compatible Hayward H250 H-Series Millivolt, ED1, and ED2 pool and spa heaters.

Will HAXHXA1253 fit an H250FDN?
No. The H250FDN Universal H-Series uses a different heat exchanger.

Will it fit an H250IDL2 heater?
No. The H250IDL2 uses a different heat exchanger assembly.

Does HAXHXA1253 replace HAXHXA1250?
Yes. HAXHXA1253 is listed as the current replacement for HAXHXA1250.

How many tubes does this heat exchanger have?
The assembly uses 8 tubes—four upper and four lower.

Is this an OEM Hayward part?
Yes. HAXHXA1253 is a genuine Hayward replacement heat exchanger assembly.

Why Buy From Pool Supply Depot?

Pool Supply Depot supplies genuine Hayward heaters, heat exchangers, pumps, filters, automation equipment, salt systems, replacement parts, and professional pool equipment nationwide.

Because Hayward has produced multiple H250 heater generations using different heat exchangers, we strongly recommend confirming your complete heater model before ordering.

Send us the heater model number and serial number and our pool equipment specialists can help verify the correct replacement.

Order the Hayward H-Series H250 Heat Exchanger Assembly | HAXHXA1253 from Pool Supply Depot today.