The midday sun in February 2026 is already starting to hint at the sweltering swim season ahead, and if you own a large in-ground pool, you know that the “honeymoon phase” of pool ownership ends the moment you have to spend your Saturday morning scrubbing calcium deposits off the waterline. I’ve spent the last month testing the heavy hitters of the Maytronics lineup: the Dolphin Nautilus CC Supreme and its accessorized sibling, the Nautilus CC Supreme Plus.
These aren’t your average “floor-only” cleaners. They are the high-performance, Wi-Fi-enabled beasts of the pool world, designed for large in-ground setups up to 50 feet. They represent the “Supreme” tier for a reason—they offer dual-drive motors, advanced waterline scrubbing, and app-based scheduling. However, as I rolled these units out to my pool deck, I realized that the “Plus” designation creates a fork in the road for many buyers. It isn’t a difference in the robot’s “brain” or its cleaning “muscle,” but rather a difference in the long-term survival and logistics of owning a high-end machine. After a dozen cleaning cycles, I’ve found that while the cleaning results are identical, the ownership experience varies wildly based on how you handle the “gear” that comes with the robot.
The Key Difference: The Protection & Logistics Package
The fundamental difference between the Dolphin Nautilus Supreme and the Supreme Plus is the inclusion of the Universal Caddy and Classic Caddy Cover. Both models utilize the exact same Nautilus CC Supreme robotic unit, featuring Dual Drive steering, Wi-Fi connectivity, and waterline scrubbing capabilities for pools up to 50 feet.
The Supreme Plus (Model NAUT-SUP-CADCOV) is a comprehensive bundle designed to safeguard the robot from UV damage and facilitate easy transport, whereas the standard Supreme (Model 60 CC Supreme) is the standalone robot and power supply. There is no internal hardware or software difference between the two robots themselves; the “Plus” refers entirely to the storage and transportation ecosystem.
Comparison Table: Dolphin Nautilus Supreme vs. Supreme Plus
| Feature | Dolphin Nautilus Supreme | Dolphin Nautilus Supreme Plus |
| Cleaning Coverage | Floor, Walls, & Waterline | Floor, Walls, & Waterline |
| Max Pool Length | 50 Feet | 50 Feet |
| Steering Tech | Dual Drive (360° Agility) | Dual Drive (360° Agility) |
| Connectivity | Wi-Fi (MyDolphin Plus App) | Wi-Fi (MyDolphin Plus App) |
| Universal Caddy | Not Included | Included |
| Classic Caddy Cover | Not Included | Included |
| Filter Access | Top-Load Extra Large | Top-Load Extra Large |
| Scrubbing | Triple Active Scrubbing | Triple Active Scrubbing |
| Cycle Options | Quick, Standard, Enhanced | Quick, Standard, Enhanced |
| View Current Price on Amazon | View on Amazon | View on Amazon |
Detailed Comparative Review: My Personal “Supreme” Experience
When you’re dealing with a robot that costs as much as a high-end laptop, the stakes feel higher. Here is how my month with these twin titans played out.
Design: The Dual-Drive Powerhouse
The first time I dropped the Nautilus CC Supreme into the water, I was struck by its agility. Because these units feature Dual Drive motors, they can literally turn on a dime. I watched it navigate around my pool steps and the deep-end ladder with a level of grace I’ve never seen in the “single-motor” entry-level models.
The Supreme Plus design experience is identical in the water, but on the pool deck, it’s a total game-changer. These robots are heavy—nearly 25 pounds dry and significantly more when they’re full of water. The “Plus” bundle includes the Universal Caddy, which allowed me to wheel the robot from my garage to the pool with one hand. Without the caddy (on the standard Supreme), I found myself awkwardly lugging the robot by the handle, which isn’t just a workout—it’s a risk to the machine if you accidentally drop it on the concrete.
Ease of Use: Wi-Fi and “Always Connected” Cleaning
Both machines use the MyDolphin Plus App. I’m usually skeptical of “smart” appliances, but being able to schedule a “Quick Clean” from my office while I was stuck in a meeting was genuinely satisfying. By the time I got home, the pool floor was spotless.
The Supreme Plus bundle adds a layer of “Ease of Use” through its storage solution. The Classic Caddy Cover is more important than it looks. In my test, I left the standard Supreme out on the deck for three days. The sun in 2026 is brutal, and I could already see the plastic on the power supply starting to get that “hot to the touch” brittleness. With the Supreme Plus, I just wheeled it onto the caddy and zipped up the cover. It kept the cables from tangling and the sensors away from the UV rays.
Functions: Waterline Scrubbing and Triple Brushes
This is where the “Supreme” name is earned. Most robots just “climb” the walls. These units actually grip and scrub the waterline. I had a stubborn ring of pollen and sunscreen oils around the top of my pool. I set both robots to the “Enhanced” cycle, and I watched them spend extra time at the surface, shimmying horizontally along the tile line.
Both the Supreme and the Supreme Plus feature Triple Active Scrubbing. There is a center brush in addition to the front and back rollers. This means that even if the robot is moving slowly, it is pulverizing debris. In my month of testing, I didn’t have to pick up a manual brush once. Whether I was using the standalone Supreme or the Plus bundle, the pool looked like a professional crew had just left.
Maintenance: The XL Filter Challenge
Both models feature the Extra-Large Top-Load Filter Baskets. These are significantly larger than what you’ll find on the Nautilus CC or E10 models. I found they could handle a week’s worth of heavy leaf fall without needing to be emptied.
Maintenance on the Supreme Plus felt more organized. The caddy has a specific spot for the power supply and a “hook” for the 60-foot cable. On the standard Supreme, I ended up with a “birds nest” of blue cable on my garage floor. The “Plus” version forces you to be a more organized pool owner, which ultimately extends the life of the cable (the most common point of failure for these robots).
Dolphin Nautilus CC Supreme Robotic Pool Vacuum Cleaner
Pros:
- Top-Tier Performance: Identical cleaning power to the most expensive bundles.
- Dual Drive: Unmatched agility in complex pool shapes.
- Wi-Fi Connectivity: Remote scheduling and “manual drive” mode via the app.
- Waterline Mastery: The best horizontal waterline scrubbing in the industry.
Cons:
- Heavy Lifting: No caddy means you’re carrying 25+ lbs by hand.
- Storage Woes: The 60-foot cable is difficult to store neatly without a caddy.
- Exposure Risk: No cover leaves the expensive electronics vulnerable to sun and rain.
Dolphin Nautilus CC Supreme Plus Robotic Pool Vacuum Cleaner
Pros:
- Investment Protection: The caddy and cover add years to the robot’s lifespan.
- Mobility: Effortless transport from storage to the pool edge.
- Cable Management: Keeps the 60-foot power cord from kinking or tangling.
- Organization: Creates a “home base” for the robot, power supply, and cord.
Cons:
- Higher Initial Cost: You’re paying a premium for the accessories.
- Footprint: The caddy takes up a bit more floor space in your garage or shed.
The Final Recommendation: Is the “Plus” Worth It?
After running both units through thirty days of dirt, leaves, and sun, the verdict comes down to how you value your investment.
I recommend the Dolphin Nautilus CC Supreme if you already have a storage solution or a custom-built pool shed where the robot can live safely away from the sun. If you are on a strict budget but want the absolute best cleaning technology (Dual Drive and Waterline Scrubbing), you can save some money by skipping the bundle.
- ALWAYS CONNECTED: With the Dolphin Nautilus CC Supreme robotic pool vacuum cleaner, schedule...
- WATERLINE SCRUBBING: Dolphin's powerful technology ensures a spotless waterline. As your robot...
I recommend the Dolphin Nautilus CC Supreme Plus if you are spending $1,000+ on a robot and want it to last for a decade. The Universal Caddy is not just a convenience; it’s a safety feature for your back and the robot’s plastic chassis. The Cover is essential for anyone who doesn’t have a shaded storage area. For the relatively small price difference, the Plus bundle provides the logistics and protection that a machine of this caliber deserves.
- SAFEGUARD YOUR INVESTMENT: This Dolphin Nautilus CC Supreme Wi-Fi includes the Universal Caddy...
- ALWAYS CONNECTED: With the Dolphin Nautilus CC Supreme robotic pool vacuum cleaner, schedule...
Personally, I would choose the Nautilus CC Supreme Plus. I’ve seen too many expensive robots ruined by “cord-kink” and sun damage. Having the caddy makes the daily “drop-in” much less of a chore.
Frequently Asked Questions (FAQs)
Q: Can I buy the caddy later?
A: Yes, the Maytronics Universal Caddy is sold separately. However, buying it as the Supreme Plus bundle is almost always cheaper than buying the robot, caddy, and cover individually.
Q: Does the “Plus” model have better Wi-Fi?
A: No. The internal Wi-Fi hardware and the MyDolphin Plus App features are exactly the same for both the Supreme and the Supreme Plus.
Q: Is the Nautilus Supreme good for vinyl liners?
A: Yes! I tested it on both plaster and vinyl. The brushes are designed to be “active” enough to scrub algae but “gentle” enough not to scuff or tear a vinyl liner.
Q: Does it pick up fine sand?
A: Both models come with ultra-fine filter panels. In my testing, it picked up everything from large oak leaves down to the fine “desert dust” that settles on the floor after a windstorm.
Q: How long is the warranty?
A: Both models typically come with a 3-year limited warranty, but always check the specific retailer’s listing for the latest 2026 coverage details.
