Product Overview

The Pentair ETi 400 Heat Exchanger Replacement 475623 is a genuine OEM replacement component designed for the Pentair ETi 400 High Efficiency Gas Heater. The heat exchanger is one of the most important parts of the heater, transferring heat from the combustion system into the pool or spa water without direct contact between the flame and the water.

Built with Pentair’s TitanTough™ titanium heat exchanger technology, this replacement part is designed for long-lasting durability, efficient heat transfer, and resistance to corrosion in demanding pool and spa environments. It is ideal for restoring heating performance when the original heat exchanger is worn, leaking, scaled, or no longer operating efficiently.

Ideal For

This heat exchanger replacement is ideal for:

Pentair ETi 400 heater repairs
Replacing a leaking or damaged heat exchanger
Restoring pool or spa heater efficiency
Professional pool heater service and maintenance
Residential pool and spa heating systems using the ETi 400 model

Key Features

Genuine Pentair OEM Replacement
Manufactured by Pentair for proper fit, reliable performance, and compatibility with ETi 400 heaters.

Designed for the Pentair ETi 400 Heater
Made specifically for the Pentair ETi 400 High Efficiency Gas Heater.

TitanTough™ Heat Exchanger Construction
Built with corrosion-resistant titanium technology for enhanced durability in pool and spa applications.

Restores Heater Performance
Helps return the heater to proper heat-transfer efficiency when the existing heat exchanger is damaged or worn.

Reliable Heat Transfer
Transfers thermal energy into pool or spa water while keeping combustion gases separated from the water path.

Professional Replacement Part
A critical heater component recommended for qualified service and installation.

Benefits

Helps Extend Heater Life
Replacing a failed heat exchanger can help restore the heater instead of replacing the entire unit.

Improves Heating Efficiency
A clean, properly functioning heat exchanger allows the heater to transfer heat more effectively.

Corrosion-Resistant Design
Titanium construction helps withstand harsh pool water conditions when water chemistry is properly maintained.

OEM Fit Reduces Installation Issues
Using the original Pentair replacement part helps ensure proper fit and compatibility.

Supports Safe Heater Operation
A damaged heat exchanger can affect heater performance and reliability, making timely replacement important.

Specifications

Customer-Facing Q&A

Q: Is this a genuine Pentair replacement part?
A: Yes. Part number 475623 is a genuine Pentair OEM heat exchanger replacement.

Q: What heater does this fit?
A: This heat exchanger is designed for the Pentair ETi 400 High Efficiency Gas Heater.

Q: What does the heat exchanger do?
A: The heat exchanger transfers heat into the pool or spa water while keeping the combustion system separate from the water.

Q: Is this made from titanium?
A: Yes. This replacement uses Pentair’s TitanTough™ titanium heat exchanger design for corrosion resistance and durability.

Q: When should this part be replaced?
A: Replacement may be needed if the heat exchanger is leaking, damaged, scaled, corroded, or no longer allowing the heater to operate efficiently.

Q: Can a homeowner install this part?
A: Because this is a major gas heater component, installation should be performed by a qualified pool heater technician or licensed professional.