Among the most trusted names in robotic pool cleaning, Maytronics Dolphin consistently delivers innovation, performance, and long-term reliability. In this comparison, we evaluate two of their popular residential models: the Dolphin S300 vs Dolphin T35. While these models share visual similarities and offer advanced features, they serve distinct user profiles. The S300 is part of the more premium S-Line series, designed with smart control and robust functionality. The T35, a cost-effective mid-tier model, offers simplified operation and standard capabilities for small to medium in-ground pools.
To help pool owners make the most informed decision, we break down all technical, operational, and feature-related differences between the Dolphin S300 and Dolphin T35, providing a detailed side-by-side comparison that covers everything from cleaning performance to smart technology integration.
Contents
- Differences Between Dolphin S300 vs Dolphin Dolphin T35
- Pool Compatibility and Cleaning Coverage
- Navigation Technology and Mobility Performance
- Scrubbing and Debris Removal Efficiency
- Filtration and Debris Capacity
- Cable Length and Tangling Prevention
- Smart Features and App Control
- Scheduling and Automation
- Weight, Portability, and Maintenance
- Operating Cost and Energy Efficiency
- Quick Rundown Of Dolphin S300
- Quick Rundown Of Dolphin Dolphin T35
- Conclusion
Differences Between Dolphin S300 vs Dolphin Dolphin T35
Pool Compatibility and Cleaning Coverage
The Dolphin S300 is designed to clean in-ground pools up to 50 feet, offering complete surface cleaning across the floor, walls, and waterline. This makes it an excellent choice for mid to large residential pools that require consistent and comprehensive cleaning routines.
The Dolphin T35, on the other hand, is best suited for pools up to 40 feet. It is capable of cleaning the floor and walls, but does not support waterline scrubbing, which means users may need to manually clean the tile band where debris and oils commonly accumulate.
Winner: Dolphin S300
Its ability to clean the waterline in addition to floor and walls gives it a distinct advantage in maintaining total pool cleanliness.
Both models utilize CleverClean™ scanning, which allows the robot to map out an efficient cleaning route. This system ensures the robot doesn’t waste time covering the same area multiple times and achieves optimal coverage within the cycle.
The S300 upgrades this functionality with PowerStream™ mobility, which uses side water jets to enhance wall climbing ability and ensure a strong grip on vertical and uneven surfaces. It improves the robot’s ability to navigate tight corners and slippery walls with better precision.
The T35 lacks PowerStream™ and uses a more traditional wheel-based mobility system. While adequate for floors and straight walls, it may struggle with curved surfaces and less predictable pool contours.
Winner: Dolphin S300
PowerStream™ technology delivers superior maneuverability and wall adherence, especially for complex pool layouts.
Scrubbing and Debris Removal Efficiency
The S300 is equipped with dual active brushes, both spinning independently at high speed. These brushes work on both the front and rear, maximizing contact and thoroughly scrubbing all surfaces. This aggressive cleaning action is especially beneficial for removing algae, grime, and biofilm that can build up on walls and the waterline.
In contrast, the T35 uses a single active front brush. While it provides strong floor scrubbing and decent wall cleaning, it doesn’t match the dual-brush coverage or effectiveness of the S300—especially when dealing with stubborn contaminants or seasonal buildup.
Winner: Dolphin S300
Dual active brushes provide superior surface agitation and ensure a deeper clean across all zones of the pool.
Filtration and Debris Capacity
Filtration is another area where the S300 clearly excels. It features a multi-layer filter basket that captures both large and ultra-fine particles simultaneously, eliminating the need to switch filters based on debris size. Its large-capacity basket also means fewer interruptions for emptying, particularly during heavy cleaning cycles.
The T35 includes a top-load fine filter cartridge, which captures medium-sized debris effectively. However, it lacks the multi-layer structure of the S300 and may not capture ultra-fine debris as efficiently without an upgraded insert. The smaller basket also fills faster, requiring more frequent cleaning.
Winner: Dolphin S300
With its superior filtration system and higher debris capacity, the S300 delivers better water clarity and lower maintenance.
Cable Length and Tangling Prevention
The Dolphin S300 comes with a 60-foot swivel cable, specifically designed to prevent tangling as the robot navigates around the pool. This feature keeps the cleaner running smoothly and minimizes manual intervention or repositioning during long cleaning sessions.
The T35 includes a 50-foot floating cable without a swivel mechanism. Over time, this can lead to cable coiling or tangles, especially in freeform pools or if the cleaner operates frequently.
Winner: Dolphin S300
Its longer, swivel-equipped cable ensures more consistent operation and easier maintenance.
Smart Features and App Control
The S300 features Bluetooth connectivity through the MyDolphin Plus app, allowing users to control cleaning cycles, view cleaner status, and schedule cleanings remotely. This level of interactivity is ideal for tech-savvy homeowners who want to automate pool cleaning and manage their robot from a smartphone.
The T35 does not offer any smart connectivity. While it includes a basic weekly scheduler via its power supply, it lacks remote operation or app-based customization.
Winner: Dolphin S300
With smart control and scheduling flexibility through the app, the S300 offers a more modern and convenient user experience.
Scheduling and Automation
Both robots include a weekly scheduler, letting users set cleaning frequencies to every day, every other day, or every third day. This ensures regular maintenance and keeps the pool clean without needing daily activation.
However, the S300’s scheduler can be programmed via the app, offering additional flexibility and remote management. The T35 requires manual configuration on the power supply unit, which is less convenient.
Winner: Dolphin S300
App-based scheduling provides a more seamless and hands-off automation process.
Weight, Portability, and Maintenance
Both the S300 and T35 weigh under 20 pounds, making them easy to lift and maneuver. Each has an ergonomic handle for removal from the pool and includes a top-access filter system that simplifies post-cleaning maintenance.
The T35 is slightly lighter at 16.5 lbs, which could appeal to users who value portability or need to transport the cleaner between multiple locations.
Winner: Tie
Both units are lightweight, compact, and easy to handle. The S300 offers more features, while the T35 wins on raw portability.
Operating Cost and Energy Efficiency
Both cleaners operate on low voltage and are exceptionally energy efficient. They cost approximately 5 cents per hour to run and require no additional plumbing or booster pumps.
Their plug-and-play design makes them a hassle-free and cost-effective solution for maintaining water cleanliness and balance.
Winner: Tie
Equally efficient, both models are eco-friendly and inexpensive to operate over the long term.
Quick Rundown Of Dolphin S300
Quick Rundown Of Dolphin Dolphin T35
Conclusion
Choose Dolphin T35 if you’re looking for a simple, reliable, and affordable robotic pool cleaner designed for small to mid-sized pools. It offers strong floor and wall cleaning, easy maintenance, and dependable results without added complexity.
Choose Dolphin S300 if you want top-tier performance with smart controls, superior filtration, waterline cleaning, and enhanced wall mobility. Its robust feature set makes it a long-term investment for homeowners who want the best in residential pool cleaning technology.
Overall Winner: Dolphin S300
With more comprehensive cleaning coverage, dual-brush scrubbing, app connectivity, superior filtration, and a tangle-free cable, the Dolphin S300 is clearly the more advanced and versatile robotic pool cleaner. It is ideal for users who prioritize performance, convenience, and full pool cleanliness.