By Justin D. • April 17th, 2025
If you want the best of the best robotic pool cleaner, the Dolphin Sigma may be for you.
Hey guys, welcome back to the Pool Nerd. I'm Justin, your resident pool aficionado. And today, I am reviewing the newest Dolphin Sigma. A part of the Dolphin ProLine, this robot is one of the most impressive I've ever tested.
It's the Most Advanced Robotic Pool Cleaner I've ever tested.
Why? Commercial-Grade Performance with NanoFiltration and a Gyroscope. With three motors, four brushes, and a set of NanoFilters included, no other pool robot really came close to being as effective.
Why the Dolphin Sigma is the Best Pool Robot You Can Buy
Blending automation, commercial-grade power, and exceptional filtration, the Dolphin Sigma is in a league of its own. If you're on the hunt for a pool robot that truly delivers, stick around—I'll walk you through the standout features, what it's like to own, where to snag the best deal, and even how it stacks up against other top contenders. Ready? Let's dive in.
The Dolphin Sigma isn't just any pool robot—it's Maytronics' flagship model, built on their commercial-grade ProLine platform. It's equipped with commercial motors and even a gyroscope, and you can tell the difference as soon as it starts working. After putting it to the test, the results speak for themselves.
Compared side-by-side with other top-tier pool robots, the Sigma is in a class of its own. It filters over 75 gallons of water per minute, which crushes everything else on the market... Watching it in action feels like seeing a high-performance sports car on the track—it's fast, efficient, and seriously impressive.
What makes it so good? The Dolphin Sigma's motors are adapted straight from the Dolphin Wave 80, a commercial pool robot that comes with a hefty $2,500 price tag. The Sigma, built on the same platform, not only costs less but also offers more. With Wi-Fi connectivity and the myDolphin Plus app, it's a cleaning machine that can automate its schedule and adapt to your pool's needs. It's like having a personal pool boy, automatically clean, vacuum, and scrub daily – all from the palm of your hand.
Whether you're upgrading from an older robot or just diving into the world of automated pool cleaners, the Sigma makes a compelling case for being the best robotic pool cleaner on the market today.
The MyDolphin Plus App
The MyDolphin Plus app is the best app on the market for pool robots. After testing dozens of pool robots, I can confidently say this app gives the Sigma a clear edge over the competition. From a built-in remote control that lets you steer it around to advanced scheduling options, the app is packed with features you won't find on just any Dolphin robot.
Here's the catch—not all Dolphin models with app connectivity come with these bells and whistles. The Sigma stands out because it combines the MyDolphin Plus app with advanced gyroscopes and sensors. This powerhouse duo tracks cleaning cycles, distance traveled, and other metrics, giving you insights into its performance and ensuring your pool is spotless every time.
Setting it up couldn't be simpler. The Sigma's "Connect Anywhere" power supply lets you plug it in, link it to your home Wi-Fi, and you're good to go. You can control your robot from anywhere, whether you're lounging in your backyard or halfway across the country. Forget to start a cleaning cycle before leaving for vacation? No problem—just open the app, hit start, and relax knowing it's handled.
For me, the convenience alone was worth it. I've had plenty of "Oops, I forgot" moments, but being able to manage everything from my phone saved me every time. And the standout feature? The Weekly Smart Timer. It's like setting up a personal butler for your pool—schedule cleanings, let the Sigma do its thing, and never think twice about it.
Weekly Smart Timer
Picture this: your pool sparkling clean every day, and you didn't have to lift a finger. Sound too good to be true? The Dolphin Sigma makes it happen with its Advanced Weekly Timer on the MyDolphin Plus app. You can program specific days and times for it to run, like clockwork. Want a pre-weekend clean at 5 p.m. on Friday? Or a mid-morning clean at 10 a.m. on Sunday? Easy. Just set it and forget it.
If you've never owned a robotic pool cleaner, let me clue you in—this feature is a must have. Most other pool robots, like the Dolphin Nautilus CC or Dolphin Explorer E20, require you to physically walk out to the pool and start them up every single day. And that's if they're corded.
Cordless models? They're another level of hassle. You've got to go outside twice a day—once to fish it out and charge it, then again to toss it back in the pool. Trust me, after reviewing cordless models like the Aiper Seagull Pro, Aiper Scuba S1 Pro, and Beatbot Aquasense Pro, I can confidently say: it's a pain. The constant recharging and juggling are enough to make you question why you didn't go with something better.
That's why the Sigma stands out. Its advanced weekly timer takes automation to a level most cleaners can't touch. The difference? True convenience. You get full customization over your cleaning schedule without stepping outside. It's an entirely hands-off experience that's light-years ahead of other models in the Dolphin lineup.
For anyone who values their time—or just hates extra chores—the Sigma's timer is the secret feature you didn't know you needed. And honestly, after using it, I can't imagine settling for anything less.
Gyroscopic Sensors
The Dolphin Sigma takes a page from the commercial playbook with its gyroscopic sensors, and the results are nothing short of impressive. These sensors are the brains behind the Sigma's navigation, helping it glide through your pool with purpose and precision. Paired with SmartNav 3.0 Scanning Software, it doesn't just clean—it strategizes.
If you've owned a pool cleaner that left frustrating patches of dirt behind, you'll immediately notice the difference. The Sigma's gyroscopic sensors and SmartNav 3.0 don't just promise better cleaning—they deliver it, consistently and effortlessly.
Waterline Cleaning
The Dolphin Sigma doesn't just clean your pool; it takes on the spots most robots ignore. With its three commercial-grade motors and gyroscopic sensors, it scrubs everything—from the floor to the walls and even up to the waterline. And let me tell you, the waterline is where it really shines.
Watching the Sigma work its magic was kind of mesmerizing. It climbed my pool walls like it was defying gravity, brushing all the way up to that pesky waterline where dirt, oils, and debris tend to collect. If you've ever had to scrub this area by hand, you know how annoying it can be. With the Sigma, you can toss that scrubbing brush for good.
But here's the cool part: it's not just luck or engineering—it's the Dual Stabilizer. At the top of the Sigma's body, there's a handle that doubles as a floating stabilizer. As the robot approaches a wall, you can actually see this stabilizer float toward the surface, helping the Sigma grip and climb with ease. It's like watching a gecko defy gravity on a window.
Compared to other Dolphin models I've tested, the Sigma crushes it at the waterline. After digging into the details, it all made sense. The stabilizer isn't just a clever add-on; it's the secret that gives the Sigma an edge. If you want a pool that's clean from top to bottom—without lifting a finger—this is the robot to beat.
Vacuuming Power
With its three commercial-grade motors, the Sigma's vacuuming power is next-level. I was blown away. Compared to other robots I've tested, like the Beatbot Pro, Aiper Scuba S1 Pro, and Dolphin Nautilus CC, the Sigma made them look like amateurs. At over 4,500 gallons per hour, it's in a league of its own.
These three motors aren't just powerful—they're relentless. Whether it's leaves, sand, or the finest particles of dust, the Sigma scoops it all up without breaking a sweat. Watching it work is like seeing a high-performance vacuum shred through messes your old one couldn't touch.
When it comes to sheer performance, nothing else even comes close. If you've struggled with pool robots that leave debris behind or can't handle tougher messes, the Sigma is the upgrade you've been waiting for. It's the difference between "good enough" and "wow, that's spotless."
Filtration
A pool robot is only as good as its filtration system. It's the core of what makes a cleaner effective, and for many robots, it's the weak link. Not the Dolphin Sigma.
Its filtration setup isn't just impressive—it's the best filter out there...period. With two filter options—standard filters and NanoFilters—it's built to tackle debris of all sizes.
Dual Filter Cartridges
Both filters are top-loading, making them incredibly easy to access. Just pop them out from the top of the robot—no flipping it over, no struggling with awkward access points, or disassembling the robot to access the filter.
Standard Filters
The Sigma's standard mesh filters do exactly what you'd expect: they capture the bigger stuff like leaves, twigs, and other large debris. They're designed to maximize flow rate, allowing the Sigma's powerful motors to keep working at full tilt. And thanks to the massive capacity, they hold more than you'd think.
But here's where the Sigma sets itself apart—its NanoFilters.
NanoFilters: Next-Level Filtration
These filters aren't just an upgrade—they're a pool cleaning revelation. While most pool robots stick to standard mesh filters, the Dolphin Sigma includes the upgraded Gen-2 NanoFilters. These pleated filters use micro-pore polyester fabric to capture everything—microscopic dirt, fine sand, algae, you name it.
I put them side by side with the standard filters, and the difference was night and day. The NanoFilters captured particles so small, they made the standard filter look like it was missing half the dirt. And here's the kicker: they also grab leaves and larger debris without clogging.
Which Filter Should You Use?
If you're wondering which filter to stick with, my vote goes to the NanoFilters. They're versatile, they capture everything from big leaves to microscopic particles, and they're just easier to use. While the standard filters are nice to have as a backup, the NanoFilters were my go-to choice every time.
With the Dolphin Sigma, you're not just getting a robot that cleans your pool—you're getting one that cleans it better than anything else on the market.
Comparing the Dolphin Sigma
If you're on the fence about the Dolphin Sigma, let me break it down by comparing it to other top pool cleaners and styles. Whether you're upgrading from an older model or trying to decide between corded and cordless, the Sigma has a lot to offer. Let's dive in.
Versus Pressure-Side and Suction-Side Cleaners
Still using a pressure-side or suction-side cleaner? Trust me, it's time for an upgrade. Switching to a robotic pool cleaner like the Sigma is a no-brainer. Why? Let's start with efficiency.
Robotic pool cleaners, powered by DC motors, are over 85% more energy-efficient. The difference on my electricity bill was immediately noticeable—it practically pays for itself in savings. And that's just the beginning.
The performance boost is where you'll really feel the difference. No more fumbling with booster pumps, dealing with tiny leaf bags, or watching your pool sweep wander aimlessly across your pool. The Sigma is plug-and-play simplicity with the muscle to match. It's fast, effective, and makes pool cleaning effortless.
Versus Cordless Models
Now, let's talk about cordless pool robots and how the Sigma measures up. Spoiler alert: it's not even close.
Cordless models like the Aiper Scuba S1 Pro and Beatbot Aquasense Pro might sound convenient, but after testing nearly every top cordless cleaner, I wasn't impressed. It's no wonder that around 40% of cordless models end up getting returned. Constant recharging, weak suction, and underwhelming performance left me disappointed. It feels like these companies put more effort into flashy marketing than building a solid product.
The Sigma, on the other hand, outclasses cordless robots in every way. Its power is unmatched, its suction is strong enough to pick up everything from leaves to fine sand, and there's no downtime for recharging. While cordless models might seem appealing for their mobility, they just can't match the Sigma's reliability and cleaning ability.
If you're looking for true pool-cleaning automation, the Sigma is light years ahead. Cordless robots? They're like the training wheels of pool cleaning—once you experience the Sigma, you'll never go back.
The Dolphin Sigma doesn't just hold its own—it dominates. Whether you're comparing it to pressure-side cleaners, other Dolphin models, or cordless robots, it comes out on top every time. If you're serious about keeping your pool clean with minimal effort, the Sigma is the clear choice.
Value: Why the Dolphin Sigma is Worth Every Penny
When it comes to value, the Dolphin Sigma delivers in a way that few other pool robots can. This isn't just another cleaner—it's a game-changing upgrade. With its commercial-grade performance, Wi-Fi connectivity, MyDolphin Plus app, NanoFilters, and more, the Sigma is a powerhouse that blew me away.
One thing that sets the Sigma apart is the gap in performance between its ProLine commercial-grade motors and the standard motors found in other Dolphin models. You can see and feel the difference immediately—the level of clean is on another level. Add in a 50% longer 3-year warranty, and you've got a robot that's built to last.
Top-tier performance, superior filtration, and the peace of mind that comes with an extended warranty—what more could you ask for? The Sigma is one of those investments you won't regret. I definitely don't.
Certified Open Box
Love the idea of owning a Dolphin Sigma but want to score the best deal? Same here. That's why you should check out Certified Open Box or Certified Refurbished models.
These are one of the pool industry's best-kept secrets. You can get a like-new Sigma at a fraction of the price, complete with a full warranty. That's right—no risks, just savings.
Head over to ThePoolNerd.com/deals to find the best prices on open-box, refurbished, and brand-new robotic pool cleaners. Why pay full price when you can save hundreds and still enjoy the same incredible performance?
Final Verdict
So what's my final verdict on the Dolphin Sigma?
It's Pool Nerd approved.
It's hard to imagine a pool cleaner better than this. The Dolphin Sigma combines three commercial-grade motors, NanoFilters, and full pool-cleaning automation to create one of the most impressive pool robots I've ever tested.
What really sets it apart is how it blends the power of commercial-grade performance with the convenience of top residential features. With its gyroscope for precision navigation, the MyDolphin Plus app for remote control and scheduling, and a 3-year warranty that goes the extra mile, the Sigma doesn't just clean your pool—it makes the process effortless.
Yes, it's on the pricier side, but let me be clear: it's worth every penny. There's simply nothing else on the market that checks all the boxes quite like this. If you're ready to take your pool cleaning game to the next level, the Sigma is the one to beat.
If you wanna keep nerding out over your pool, head on over to my deals page at ThePoolNerd.com/deals where I post the best deals on robotic pool cleaners and other pool equipment.
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