Product Overview

The Raypak Tube Bundle 336/337 ASME | 010057F is a genuine OEM copper heat exchanger tube bundle designed for select Raypak 336A Atmospheric and 337A Low NOx Digital pool and spa heaters equipped with the commercial-style ASME metal heat exchanger/header configuration.

The tube bundle is the primary heat-transfer component inside the heater. Pool water flows through the copper tubes while combustion heat passes across the exterior, transferring energy into the circulating water.

Raypak part 010057F is intended for compatible 336A / 337A ASME heaters manufactured prior to December 2019. Because Raypak has used different heat exchanger designs across production periods and heater configurations, the complete model, serial number, manufacture date, and header type should be verified before ordering.

Ideal For

• Raypak 336A ASME heater repairs
• Raypak 337A Low NOx ASME heaters
• Commercial pool heater applications
• Metal-header Raypak heaters
• Replacing a leaking heat exchanger
• Replacing a scaled or corroded tube bundle
• Professional pool-heater service and repair
• Restoring proper heater heat transfer

Key Features & Benefits

• Genuine Raypak OEM Replacement – Manufactured for compatible Raypak heating equipment.
• 336A / 337A Compatibility – Designed for compatible Atmospheric 336A and Low NOx 337A heaters.
• ASME Configuration – Intended for compatible commercial-style metal-header heat exchangers.
• Copper Tube Construction – Provides excellent thermal conductivity for efficient heat transfer.
• Complete Replacement Kit – Includes the tube bundle plus installation components required for the applicable repair.
• Metal Heat Exchanger Application – Not intended as a direct substitute for polymer-header tube bundles.
• Commercial-Grade Application – Suitable for compatible Raypak commercial/ASME pool and spa heater installations.
• OEM Hydraulic Design – Maintains the intended internal water path and heat-transfer characteristics of the heater.

Specifications

POOL360 confirms the copper construction, 336A/337A fitment, included baffle, stud bolt kit, and nine header gaskets, along with UPC 840891020073.

Compatible Heater Applications

Raypak 010057F is designed for compatible:

• Raypak 336A Atmospheric heaters
• Raypak 337A Low NOx Digital heaters
• ASME / metal-header heat exchanger configurations

IMPORTANT COMPATIBILITY NOTICE

Do not order this tube bundle based only on the heater's BTU rating.

Raypak heaters may use different tube bundles depending on:

• Complete model number
• ASME vs. standard configuration
• Metal vs. polymer headers
• Manufacturing date
• Copper vs. cupro-nickel construction

POOL360 specifically identifies 010057F as the 336A/337A ASME copper tube bundle for units prior to December 2019.

ASME Metal Header vs. Polymer Header

The 010057F is an ASME metal-header tube bundle.

It should not be confused with Raypak's polymer-header tube bundle for the same general heater size.

For example, Raypak's parts catalog separately identifies:

• 010057F – 336/337 ASME metal-header copper tube bundle
• 010061F – 336/337 polymer-header copper tube bundle
• 010370F – 336/337 ASME metal-header cupro-nickel tube bundle
• 010366F – 336/337 polymer-header cupro-nickel tube bundle

These assemblies are not automatically interchangeable.

Copper vs. Cupro-Nickel

The 010057F uses copper tubing.

For compatible 336/337 ASME applications requiring a cupro-nickel tube bundle, Raypak separately lists 010370F.

Cupro-nickel may be preferred in more demanding applications, but heater compatibility and operating conditions should be verified before changing heat exchanger materials.

Important Raypak Service Recommendation

Raypak warns that the same hydraulic or water-chemistry conditions that caused the original tube bundle to fail may also have damaged the heater's bypass valve and Unitherm Governor.

When replacing the tube bundle, Raypak recommends:

• Replacing the Unitherm Governor
• Inspecting the bypass assembly
• Correcting any water chemistry or hydraulic issue that contributed to the original failure

Failing to correct the underlying cause may result in premature failure of the new heat exchanger.

Common Signs of Tube Bundle Failure

A tube bundle may require replacement if the heater exhibits:

• Water leaking inside the heater cabinet
• Visible copper corrosion
• Scale buildup
• Reduced heating performance
• Restricted water flow
• Excessive heater cycling
• Moisture underneath the heater
• Internal tube deterioration

A qualified heater technician should diagnose the system before replacing a major component.

Installation Guidance

Replacing a Raypak ASME tube bundle requires substantial heater disassembly and involves:

• Gas-fired combustion equipment
• High-temperature components
• Water plumbing
• Electrical controls
• Safety devices

Installation should be performed by a qualified pool-heater technician or licensed professional familiar with Raypak equipment.

After installation, verify:

• Water flow
• Heater pressure
• Water leaks
• Proper combustion
• Ventilation
• Gas operation
• Safety controls
• Bypass operation

Frequently Asked Questions

What heaters does Raypak 010057F fit?
It is designed for compatible Raypak 336A Atmospheric and 337A Low NOx Digital heaters with ASME metal-header heat exchangers.

Is 010057F copper or cupro-nickel?
Copper.

Is this an ASME tube bundle?
Yes. It is the ASME metal-header configuration.

Does it fit polymer-header heaters?
No. Raypak lists a different tube bundle for polymer-header configurations.

What is the cupro-nickel version?
For compatible 336/337 ASME applications, 010370F is the cupro-nickel counterpart.

Does the kit include gaskets?
Yes. It includes nine header gaskets, along with the baffle and stud bolt kit.

Will it fit a heater manufactured after December 2019?
Do not assume so. Current distributor documentation specifically identifies 010057F for applicable units prior to December 2019. Verify the model, serial number, and manufacture date before ordering.

Why Buy From Pool Supply Depot?

Pool Supply Depot supplies genuine Raypak commercial heaters, tube bundles, heat exchangers, headers, burners, controls, pumps, filters, automation, and OEM replacement parts nationwide.

Raypak has several different 336/337 heat exchanger configurations, so if there is any uncertainty, send us the complete heater model and serial number before ordering and our team can help confirm compatibility.

Order the Raypak Tube Bundle 336/337 ASME Copper | 010057F from Pool Supply Depot today.