Product Overview

The Hayward AquaNaut® 400 Automatic Suction Pool Cleaner is a powerful 4-wheel drive cleaner designed for larger in-ground pools up to 20 ft. x 40 ft. and pools with deep ends. Powered by your pool’s existing pump and filtration system, the AquaNaut® 400 provides automatic cleaning performance without requiring a booster pump, batteries, or a separate electrical connection.

Built with Hayward’s patented V-Flex™ variable vane turbine technology, the AquaNaut® 400 is engineered to handle large debris while helping prevent clogs. Its rugged 4-wheel drive system provides added traction, stability, and climbing power, making it a strong choice for pools with deeper ends, larger layouts, and more demanding cleaning needs.

Ideal For

The Hayward AquaNaut® 400 is ideal for:

• Residential in-ground pools up to 20 ft. x 40 ft.
• Pools with deep ends
• Pool owners wanting automatic suction-side cleaning
• Pools with leaves, dirt, sand, and larger debris
• Variable-speed pump systems
• Dedicated suction lines or skimmer connections
• Concrete, gunite, fiberglass, vinyl, tile, and pebble pool surfaces
• Customers wanting a cleaner without electronics or booster pump requirements
• Regular pool maintenance between manual cleanings

Key Features

Patented V-Flex™ Turbine Technology

Self-adjusting variable vanes allow larger debris to pass through the cleaner while maintaining strong suction performance. This helps reduce clogs and supports consistent cleaning power.

4-Wheel Drive Traction

The 4-wheel drive system provides added stability, traction, and balance, especially for larger pools, deep ends, and longer cleaning runs.

Designed for Pools up to 20' x 40'

Optimized for larger residential in-ground pools, making it a strong fit for bigger backyard pool layouts and pools with deep ends.

Works with Variable-Speed Pumps

The V-Flex™ turbine helps maximize suction performance across a wide range of flow rates, making the AquaNaut® 400 a good match for many variable-speed pump systems.

Rugged Tire Treads

High-traction tires help the cleaner move across different pool surfaces and around common obstacles such as drains, slopes, and transitions.

Adjustable Roller Skirt

The patented adjustable roller skirt helps maintain suction on uneven surfaces and around pool features for more consistent debris pickup.

Programmed Steering Sequences

Multiple pre-programmed steering patterns help improve pool coverage by allowing the cleaner to turn every 11 to 14 feet.

No Booster Pump Required

Connects to a skimmer or dedicated suction line and runs from the pool’s existing pump system.

Benefits

• Automatically cleans larger in-ground pools up to 20 ft. x 40 ft.
• Strong choice for pools with deep ends
• Helps remove leaves, dirt, sand, and everyday debris
• Handles larger debris with reduced clogging
• No separate booster pump or electrical connection required
• Great option for variable-speed pump systems
• 4-wheel drive improves traction, balance, and climbing ability
• Adjustable skirt helps maintain suction on uneven surfaces
• Includes 40 ft. of hose for larger pool installations
• Suitable for multiple pool surface types
• Helps reduce manual vacuuming time
• Built by Hayward, a trusted name in pool cleaning equipment

Specifications

Customer-Facing Q&A

Q: What is the SKU for this Hayward AquaNaut® 400 cleaner?
A: The SKU is W3PHS41CST.

Q: What is the barcode or UPC?
A: The barcode / UPC is 0610377389969.

Q: What size pool is this cleaner designed for?
A: The AquaNaut® 400 is designed for in-ground pools up to 20 ft. x 40 ft. and is also a strong option for pools with deep ends.

Q: Is this a suction-side or robotic cleaner?
A: This is a suction-side automatic pool cleaner. It uses your pool pump’s suction to move and collect debris.

Q: Does this cleaner need a booster pump?
A: No. The AquaNaut® 400 connects to a skimmer or dedicated suction line and does not require a booster pump.

Q: How long is the included hose?
A: This cleaner includes 40 ft. of hose.

Q: What is the difference between the AquaNaut® 200 and AquaNaut® 400?
A: The AquaNaut® 400 has a 4-wheel drive system, 40 ft. hose, and is designed for larger pools up to 20 ft. x 40 ft. or pools with deep ends. The AquaNaut® 200 is a 2-wheel model designed for smaller pools up to 16 ft. x 32 ft.

Q: Can this cleaner handle larger debris?
A: Yes. The patented V-Flex™ variable vane turbine is designed to allow larger debris to pass through while helping prevent clogs.

Q: Will this work with a variable-speed pump?
A: Yes. The AquaNaut® 400 is designed to work well across a range of flow rates, making it a good option for many variable-speed pump systems.

Q: What pool surfaces is it compatible with?
A: It can be used on concrete, gunite, vinyl, fiberglass, tile, and pebble pool surfaces. Some smoother surfaces may require optional tire accessories depending on the pool.

Q: Does it clean walls?
A: Yes. The AquaNaut® 400 is designed to clean pool floors, walls, and coves. Wall-climbing performance may vary depending on pool shape, surface, and flow rate.

Q: What pump size is required?
A: A minimum 0.5 HP pump or approximately 35 GPM flow is recommended for proper operation.

Why Choose Hayward AquaNaut® 400?

The Hayward AquaNaut® 400 is a dependable suction-side cleaner for larger in-ground pools and pools with deep ends. With 4-wheel drive traction, patented V-Flex™ turbine technology, rugged tire treads, adjustable suction control, and programmed steering, it is built to provide reliable automatic cleaning while handling common pool debris with fewer clogs.

For in-ground pools up to 20 ft. x 40 ft., the AquaNaut® 400 offers a practical, durable, and easy-to-maintain solution for everyday pool cleaning without the need for a booster pump or electrical connection.