When it comes to high-performance robotic pool cleaners for in-ground residential pools, the Dolphin S300 vs Dolphin S400 by Maytronics stand out for their smart technology, advanced scrubbing, and reliable cleaning coverage. While both models belong to the same premium S-Line, they cater to different user expectations—the S300 offering excellent performance with app control, and the S400 introducing additional cleaning modes, gyroscopic navigation, and enhanced filtration notifications.
In this comprehensive comparison, we dive deep into every feature and function that sets these two models apart to help you determine which one is best suited for your pool maintenance needs.
Contents
- Differences Between Dolphin S300 vs Dolphin Dolphin S400
- Pool Compatibility and Cleaning Coverage
- Navigation Intelligence and Cleaning Precision
- Scrubbing System and Debris Removal
- Filtration System and Debris Management
- Cable Design and Tangling Prevention
- Smart Features and App Control
- Cleaning Modes and Customization
- Weight, Handling, and Storage
- Energy Efficiency and Operation Cost
- Quick Rundown Of Dolphin S300
- Quick Rundown Of Dolphin Dolphin S400
- Conclusion
Differences Between Dolphin S300 vs Dolphin Dolphin S400
Pool Compatibility and Cleaning Coverage
Both the Dolphin S300 and S400 are engineered for in-ground pools up to 50 feet, providing reliable and comprehensive cleaning coverage for residential pools of all shapes. Each model offers full surface cleaning—including the pool floor, walls, and waterline—ensuring that even the most commonly neglected spots, like the tile line, receive consistent scrubbing and filtration.
Where the S400 gains a slight advantage is in its ability to select from three cleaning durations: Quick Clean (1.5 hrs), Standard (2 hrs), and Enhanced (2.5 hrs). This added flexibility allows users to adapt their cleaning routine based on pool conditions.
Winner: Dolphin S400
With a broader range of cleaning modes, the S400 offers better customization for varying pool demands and debris levels.
The S300 is equipped with CleverClean™ Technology supported by PowerStream™ mobility, allowing it to map out an efficient cleaning path and maintain strong traction on vertical surfaces. PowerStream’s multi-directional jets help the cleaner stay attached during wall climbs and maneuver tight corners with stability.
The S400 builds on this with the addition of gyroscopic navigation, which adds enhanced orientation and balance awareness. This results in smoother transitions across the pool and more accurate navigation, especially in freeform pools or those with irregular features such as tanning ledges or in-pool benches.
Winner: Dolphin S400
The inclusion of gyroscopic navigation elevates the S400’s precision and ensures improved coverage and performance in complex pool layouts.
Scrubbing System and Debris Removal
Both the S300 and S400 feature dual active brushes—front and rear—which rotate independently to scrub surfaces thoroughly. These brushes target dirt, algae, and biofilm along the floor, walls, and waterline, making them extremely effective on tile, plaster, vinyl, and fiberglass surfaces.
The performance in this category is nearly identical between the two models, and both outperform single-brush or passive systems used in less advanced cleaners.
Winner: Tie
With identical dual active brush systems, both models deliver top-tier scrubbing power for deep cleaning results.
Filtration System and Debris Management
The S300 comes with a multi-layer top-load filter basket capable of capturing fine and ultra-fine debris simultaneously. This dual-level filtration removes leaves, dirt, sand, and even pollen without the need to switch filter inserts.
The S400 uses the same filter system but enhances usability with a filter full indicator via the MyDolphin Plus app. This small addition ensures users are alerted when the basket needs to be emptied, preventing clogging and maintaining optimal suction throughout the cleaning cycle.
Winner: Dolphin S400
With real-time filter status updates, the S400 takes the lead in filter monitoring and maintenance efficiency.
Cable Design and Tangling Prevention
Both models include a 60-foot swivel cable, which allows them to operate in larger pools without becoming tangled or restricted. The swivel mechanism rotates with the cleaner’s motion, ensuring unrestricted operation and minimal user interference during or after the cleaning cycle.
Winner: Tie
Equally equipped with tangle-resistant swivel cables, both models offer seamless, uninterrupted movement in pools up to 50 feet.
Smart Features and App Control
Each robot connects to the MyDolphin Plus app via Bluetooth, enabling users to start or stop cleaning cycles, monitor performance, and schedule weekly sessions. The S300 supports cycle selection through the app and basic maintenance notifications.
The S400 extends this functionality by offering manual spot cleaning, allowing users to control the robot’s path in real-time via the app. This is especially useful for targeting specific dirty spots like steps or swim-outs. The S400 also includes filter status indicators within the app—features not found in the S300.
Winner: Dolphin S400
With added app functionality such as manual steering and filter alerts, the S400 delivers a smarter and more interactive experience.
Cleaning Modes and Customization
The S300 offers two cleaning cycles: Quick (1.5 hours) for lighter maintenance and Standard (2 hours) for thorough cleanings. These modes are sufficient for regular upkeep in most residential pools.
The S400 expands the range by including an Enhanced Mode (2.5 hours), which is particularly beneficial after storms, heavy pool use, or extended downtime. This mode ensures maximum cleaning coverage and more time for scrubbing and filtration.
Winner: Dolphin S400
With three cycle options, the S400 adapts better to various pool conditions and maintenance routines.
Weight, Handling, and Storage
Both robots weigh approximately 18.5 pounds and come with ergonomic handles that simplify lifting them in and out of the pool. The top-load filters make post-cycle cleaning fast and mess-free, and both models can be paired with a Dolphin caddy (sold separately) for organized storage of the unit and power supply.
Winner: Tie
Both cleaners are equally portable, easy to maintain, and convenient to store.
Energy Efficiency and Operation Cost
As low-voltage robotic units, both the S300 and S400 consume minimal power—roughly 5 cents per hour—making them significantly more cost-effective than pressure-side or suction-side systems. Their plug-and-play design means no additional pumps or plumbing alterations are required.
Winner: Tie
Both units deliver outstanding energy efficiency and low cost of ownership.
Quick Rundown Of Dolphin S300
Quick Rundown Of Dolphin Dolphin S400
Conclusion
Choose Dolphin S300 if you’re looking for a powerful, reliable, and user-friendly robotic pool cleaner that delivers excellent cleaning results across floor, walls, and waterline—without the need for advanced tech features. It’s the perfect choice for standard residential pools and provides excellent value in the premium range.
Choose Dolphin S400 if you want the most advanced functionality, including manual steering, enhanced cleaning modes, and real-time filter alerts. For pool owners who want greater control, adaptability, and cleaning customization, the S400 stands as the superior long-term solution.
Overall Winner: Dolphin S400
With enhanced navigation, app-based control features, an additional cleaning mode, and smarter maintenance alerts, the Dolphin S400 leads as the more comprehensive and future-ready robotic pool cleaner. It is best suited for homeowners who want total cleaning confidence, control, and convenience.