Product Overview

The Pentair Kit Htexch 400K HD Heaters Mfg (Part No. 474065) is a premium replacement heat exchanger assembly kit engineered specifically for Pentair MasterTemp® and Sta-Rite® Max-E-Therm® 400K BTU pool and spa heaters. Built from heavy-duty materials and precision-manufactured to Pentair’s high standards, this kit ensures optimal heat transfer, superior corrosion resistance, and long-lasting performance — even in the toughest pool environments.

Whether you’re performing a heater overhaul or addressing reduced heating efficiency, the 474065 Kit provides everything needed to restore your Pentair heater to factory-grade performance.

Ideal For

• Pool professionals and DIY owners servicing Pentair 400K BTU heaters

• Replacements in MasterTemp® 400 or Max-E-Therm® 400 models

• Customers needing a factory-authorized heat exchanger kit

• Pools using saltwater systems, where corrosion resistance is key

Key Features

• Genuine Pentair OEM Part – Ensures compatibility and maintains factory specifications

• High-Density (HD) Construction – Designed to withstand higher stress and corrosion compared to standard models

• 400,000 BTU Capacity – Optimized for large residential and commercial pool applications

• Comprehensive Kit – Includes manifold gasket, header bolts, and all essential hardware for installation

• Improved Efficiency – Restores heater output and thermal performance

• Precision Fit – Seamless integration with Pentair heater models for quick installation

Benefits

• Restores full heating efficiency, reducing warm-up times and energy consumption

• Extends heater lifespan through durable, corrosion-resistant materials

• Prevents leaks and thermal fatigue thanks to robust engineering and sealing components

• Maintains manufacturer warranty compliance with OEM replacement parts

Technical Specifications

• Manufacturer: Pentair

• Part Number: 474065

• Heater Compatibility: MasterTemp® 400 / Max-E-Therm® 400 HD

• BTU Rating: 400,000

• Material: Heavy-Duty Copper-Nickel Alloy

• Includes: Complete Heat Exchanger Assembly Kit with Gaskets and Hardware

Customer Q&A

Q: Will this kit fit my MasterTemp 400 heater?
A: Yes. The 474065 kit is designed specifically for Pentair MasterTemp 400K BTU HD and Max-E-Therm 400K HD models.

Q: Is this the heavy-duty (HD) version?
A: Yes, this is the HD (Heavy-Duty) heat exchanger kit, engineered for saltwater or high-demand applications.

Q: Does it include gaskets and mounting hardware?
A: Absolutely. All required seals, gaskets, and mounting components are included for straightforward installation.

Q: How do I know if my heater uses the HD version?
A: Check the label on your heater. If it indicates “HD” or “Heavy Duty,” this is the correct replacement part.