The Dolphin S300 vs Dolphin S400 are two top-performing robotic pool cleaners from Maytronics’ elite S-Series, built for in-ground pools. While both models offer powerful cleaning, smart controls, and premium design, they differ in areas such as navigation, control flexibility, and cleaning customization.
In this comprehensive analysis, we break down every critical specification and performance factor to determine which model is best suited to deliver long-term value and optimal cleaning results.
Contents
Differences Between Dolphin S300 vs Dolphin S400
Design Comparison
Both the Dolphin S300 and S400 are compact, elegantly designed robotic cleaners intended for in-ground pools up to 50 feet in length. Each includes a 60-foot anti-tangle swivel cable, ensuring freedom of movement across large and complex pool layouts. The anti-tangle swivel is particularly useful in pools with tight corners or ladders, keeping cleaning uninterrupted and hassle-free.
The build quality of both models is premium, featuring an ergonomic handle for easy lifting and a rugged casing resistant to chemicals and UV exposure. At 18.5 pounds, both units are lightweight enough to be carried and retrieved without struggle, even after a full cleaning session.
Winner: Tie
Both models are identical in size, weight, cable length, and design durability. They offer equal portability and layout flexibility.
Cleaning Performance Comparison
The Dolphin S300 is equipped with dual active brushes that scrub at high speed to remove algae, bacteria, and stubborn grime from pool surfaces. It effectively cleans the floor, walls, and waterline, with a 4000 GPH suction rate that captures both large debris and fine sediment. It offers two cleaning modes: a standard 2-hour cycle and a Quick Clean mode for lighter jobs.
The Dolphin S400 uses the same brush configuration and suction performance but enhances its cleaning versatility with three adjustable cycle durations: 1.5 hours for quick cleanups, 2 hours for standard maintenance, and 2.5 hours for deep cleaning. This flexibility allows users to tailor each cleaning session based on pool usage, weather conditions, or seasonal debris loads.
In terms of filtration, the S300 uses a top-loading filter basket compatible with both fine and ultra-fine filters, allowing you to swap based on the type of debris. The S400 elevates this with a multi-layer filtration system, separating large debris from fine particles in a single run. This layered approach increases filtration efficiency and reduces the need to clean the filter between cycles.
Winner: Dolphin S400
While both models scrub thoroughly and share suction performance, the S400’s multi-mode cleaning cycles and upgraded filtration system make it more adaptive and efficient.
Feature Comparison
Both the Dolphin S300 and S400 offer smart control via the MyDolphin Plus app, available on iOS and Android. Users can remotely start, stop, and schedule cleanings, select cleaning modes, and monitor real-time status. The interface is intuitive and consistent across both models.
Where the S400 gains a clear edge is through the addition of Smart Mode navigation, which intelligently maps out cleaning patterns to ensure optimized coverage with fewer redundant movements. The S300, while efficient, uses a simpler onboard algorithm without adaptive logic. The S400 also features a Cycle Selector that lets users choose between three cleaning durations directly from the app, enhancing control based on real-world needs.
Both cleaners come with a weekly scheduler, but the S400’s smart scheduling and more advanced navigation system make it better suited for users who prefer automation and precision.
Winner: Dolphin S400
With smarter navigation, multiple cleaning cycles, and enhanced app control, the S400 delivers a more advanced and responsive user experience.
Quick Rundown Of Dolphin S300
Quick Rundown Of Dolphin S400
Conclusion
Choose Dolphin S300 if you want a reliable, user-friendly robotic pool cleaner with strong cleaning performance and smart control, all at a more affordable price. It’s a great option for users with standard cleaning needs and moderate pool conditions who value simplicity and efficiency without sacrificing quality.
Choose Dolphin S400 if you’re looking for maximum versatility, smarter cleaning intelligence, and advanced filtration. With its Smart Mode navigation, cycle selector, and multi-layer filters, the S400 is better suited for those who want more control, more adaptability, and the highest level of cleaning automation available in the S Series.
Overall Winner: Dolphin S400
With enhanced navigation, smarter cleaning modes, and a superior filtration system, the Dolphin S400 stands out as the more advanced and capable robotic pool cleaner. For users seeking a truly intelligent and customizable pool maintenance experience, the S400 offers unmatched performance and long-term value.