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3 Year Warranty
The New Sigma. With unparalleled gyroscope technology and a powerful triple motor design, the all-new Dolphin Sigma sets a new standard. Redefine performance as the Sigma combines Gen-2 NanoFiltration, myDolphin Plus App, and more, to clean like no other. It's the best Dolphin pool robot yet.
Get a better understanding of which robot is for you.
Best Pool Robots →The New ProLine™ pool robot does it again. Updated with WiFi, NanoFiltration™, & so much more, the 2025 model makes cleaning your pool simple.
Dolphin Sigma
NanoFilters
Standard Filter Set
Power Supply with myDolphin Plus App
60ft Cord with Anti-Tangle Swivel
Manual
3 Year Warranty
It’s the best Dolphin pool robot ever made. And it’s easy to see why the new Dolphin Sigma is the answer to the changing demands of pool owners everywhere. With groundbreaking gyroscope technology, commercial grade motors, and a level of efficiency never seen before, the future has already begun. The newest Dolphin features not one, not two but three highly efficient, commercial grade DC motors for the most powerful suction and navigation ever in a robot.
Learn More at SigmaRobots.com >So what exactly makes the Dolphin Sigma the most progressive pool cleaner in the world? It’s rather simple. The Sigma provides visionary mobility, inspiring design and a whole new focus on sustainability. The result is a technologically superior robotic pool cleaner. The absolute best warranty available and legendary Dolphin pool cleaner performance are standard. Discover new groundbreaking features that represent the current state of pool cleaner technology.
Yet again, everything comes back into play. It’s about a new benchmark. We are always looking forward. Not sideways, never back. We started from scratch. And we gave everything we got to make the newest Dolphin even better. Our goal was simple. To create the next Dolphin that can do more, deliver more and consume less power than ever before. The Sigma represents the future of the Dolphin brand. A fascinating future that shows what’s possible. Its design is completely new, but like that of every Dolphin that came before, it’s based on years of research and engineering. The all-new Sigma takes its place at the top of the Dolphin line and in the top echelon of its class.
With Gyroscope Mobility, quad independent brushes and triple motors, Sigma was designed for the ground up for best in class performance.
Famous for a high ratio of torque to inertia, the DC motor can provide up to five time it's rated torque without stalling. The Sigma Dolphin pool cleaner utilizes not one, not two, but three onboad DC motors. The revolutionary 24 volt DC motors require 87% less energy than the AC motors that power old fashioned pool cleaners. Efficiency demands power. That was the principle then. And it still stands today. There was an opportunity to get more from less. To optimize the work input to work output. Enter the era of gyroscope enabled robotic pool cleaners.
The D9 Processor of the ProLine™ takes it up a notch. Combined with SmartNav 3.0™, the D9 Microprocessor delivers highly optimized scanning and coverage for a new level of clean. Sigma calculates the optimal pattern for faster cleaning and improved efficiency. With its remarkable gyroscopic control system, the Sigma knows where it has and hasn't been to avoid overlapping cleaning paths and minimize cleaning time.
The new Sigma’s filtration system is so large, easy and convenient, you’ll never consider messy, cumbersome debris bags again. Cartridge filters have been around for years but pool owners found them small and difficult to clean. Previous generation cartridges made debris removal nearly impossible with small cavities that trapped small debris and fine dirt. Consider this problem solved. With the new Sigma, Dolphin introduces a new massive cartridge with the highest capacity ever recorded on a pool robot. The new Dolphin SnapLoc TM Filters make robot cleaning easier than ever. Each side simply snap sapart for quick and easy cleaning.
NanoFilters clean deeper than the standard filter. Intricately woven NanoTech material captures microscopic debris and contaminants at a micron level far smaller than Standard Dolphin Filters. Built to tackle larger and small particles at the same time, the Dolphin Sigma stops algae, dust, adirt, and more at the source. With the ability to filter deeper than standard Dolphin filters, the new Gen-2 NanoFilters clean with more efficiently than filters of the past.
Read More About NanoFilters™ →
Adding the commercial grade Sigma to your pool’s cleaning team means forever changing the way you view a clean pool. The Sigma picks up where other robots leave off with innovative new features that make owning a pool as easy and carefree as it should be. Experience the peace of mind the Sigma can bring you with its limited 3-year warranty backed by the world leader in robotic pool cleaners. It’s time to try Sigma in your own pool for 30 days. If you’re not 100% satisfied, just return it. Let Sigma challenge everything you think about robotic pool cleaners.
In a radical departure from ordinary cleaners, the Sigma pool cleaner was designed to clean all pool surfaces including the tile and waterline with pinpoint precision. For the first time ever, a consumer robot is equipped with an advanced Gyroscope to deliver precise control and positioning of the robot. While other cleaners fall from the wall, the all-new gyroscope and triple 3,000 RPM DC motor allows Sigma to remain firmly planted against the wall all the way to the top. Sigma Dolphin pool cleaners reaches every square inch of the pool as high speed spinning brushes handle difficult colonies of bacteria, algae, and biofilm. Sigma reaches deep inside pool corners, scrubs, and vacuums so you don't have to.
Everything we do day in, day out is geared toward maintaining and enhancing your pool ownership experience. From triple DC motors and microprocessors to gyroscopic systems, we’re constantly working to get the most out of every electron. But we aren’t satisfied with just using less energy. The demands of pool owners everywhere are changing and we’re listening. With new gyroscopic control and a level of efficiency never seen before, the new benchmark is set. Triple DC motors and gravity defying suction deliver an exceptional user experience while reducing energy use up to 90%. In a class by itself, the Dolphin Sigma was designed from the ground up to be easier to buy, own and operate.
Virtually any pool cleaner can vacuum loose debris, but it takes a special type of robot to remove contaminants that adhere to the pool surface. Traditional cleaners merely pass over difficult to remove pathogens, leaving them fully intact. The Sigma robot was engineered from the ground up to deep clean. Engineers gave Sigma dual scrubbing brushes that attack the bacteria, algae and biofilm that is firmly attached to the pool wall. PowerClean is especially effective against biofilm, a structured community of microorganisms that increases chlorine demand, destroys water quality, and frustrates pool owners. Guided by SmartNav 3.0, Sigma’s dual high RPM brush power scrubs every square inch of any pool with remarkable efficiency.
Gone are the days of watching your robot aimlessly wander around your pool, wondering if it will ever pick up the leaves it has skipped day after day. The new Sigma is equipped with a SmartNav 3.0 TM Robotic Scanning to ensure that every inch of your pool surface is reached. SmartNav software delivers highly optimized scanning and coverage for a new level of clean. Sigma calculates the optimal pattern for faster cleaning and improved efficiency. With its remarkable gyroscopic control system, the Sigma knows where it has and hasn’t been to avoid overlapping cleaning paths and minimize cleaning time. With the ability to sense ladders and drains, Sigma won't get hung up like ordinary cleaners. Gyroscopic controlled Pool Scanning ensures complete efficient pool surface coverage.
New for the Dolphin Sigma, you can now control the Dolphin Sigma via Siri and Voice Control. With a simple setup, you can have your Sigma cleaning with a simple command.
Virtually any pool cleaner can vacuum loose debris, but it takes a special type of robot to remove contaminants that adhere to the pool surface. Traditional cleaners merely pass over difficult to remove pathogens, leaving them fully intact. The Sigma robot was engineered from the ground up to deep clean. Engineers gave Sigma dual scrubbing brushes that attack the bacteria, algae and biofilm that is firmly attached to the pool wall. PowerClean is especially effective against biofilm, a structured community of microorganisms that increases chlorine demand, destroys water quality, and frustrates pool owners. Guided by SmartNav 3.0, Sigma’s dual high RPM brush power scrubs every square inch of any pool with remarkable efficiency.
Water in between the wheels and pool surface make it difficult for the robot to maintain traction. Continual slippage results in lost energy efficiency and reduced performance. The Sigma takes a radical departure from the conventional wheel with continuous rubber tracks. Sigma maintains constant contact even when climbing slippery surfaces. No more slipping. No more wasted energy. The rubber track also improves directional control and provides greater force than wheels. Tracked robots also glide smoothly over obstacles like drains and are capable of climbing straight up vertical walls. The Sigma’s traction is further improved with a high grip, water-optimized tread and geometric shape, which minimizes rolling resistance for superior providing superior weight distribution, traction, and wall climbing.
The underwater robotic cable swivel is one of the greatest engineering accomplishments in the pool cleaner industry. But you don’t need to be an engineer to understand the benefits of tangle-free operation. Without a swivel, every cable will eventually become a tangled hassle. This game changing swivel system, developed and patented by Dolphin, provides unlimited 360 degree rotation without wear or degradation. What other robotic pool cleaner company offers a swivel? Only Dolphin Sigma pool cleaners.
38 Reviews
| 5 star | 71% | |
| 4 star | 18% | |
| 3 star | 11% | |
| 2 star | 0% | |
| 1 star | 0% |
Cleans all the way up to waterline, walls, even the pool table base!
The one I ordered from Amazon had a defect - its handle was detached. I called Maytronics customer support and they had a new one to me two days later. I then returned the defective one to them with free shipping. Their customer support was fantastic. I’ve had the new Dolphin Sigma for a week now and am very pleased with it. It does a fantastic job cleaning the pool bottom, sides, bench and tile above the water line. I still have to sweep the tanning ledge since the Sigma isn’t supposed to be operated in less than 2 1/2 feet of water. I haven’t had many leaves, but the few I had were picked up easily. There have been several bad reviews about the remote. I didn’t get it because I have a smart phone and downloaded the Dolphin app. The app is limited but it does a good job maneuvering the Sigma in manual mode. I use it to move the Sigma onto a pool bench, then powering it off so I can easily remove it from the pool. I’ve had no problems connecting my iPhone via bluetooth to the power supply. Contrary to some other reviews, my Sigma has had no problems with my raised drains. It goes over them as if they weren’t there. One thing I haven’t seen in the other reviews is that the Sigma also works in a spa. It has no problems cleaning my unground spa, which I was unable to do with my other cleaner. I could not be more pleased with it.
The unit arrived on time, in good shape, and worked right out of the box. I was up and running in 15-20 minutes. Running it its first night is did a great job cleaning my not-so-dirty pool and the cable was clearly NOT tangled. Note: It does a GREAT job getting above the waterline to scrub the walls. Impressive wall suction and stability. First cleaning of the filters was CAKE. I really do appreciate the top load panel innovation. Note on filters: Comes with 2 sets, it is not clear which filters are the smaller micron filters. Note on manual: Digital manual accessible through the iphone app is klunky and incomplete. Note on marketing:2 stage filtering is mentioned, but I'm not sure how that is really a thing. You can SWAP filter types, but I dont see how to stack them OR where a 2nd stage would be.Perhaps a disconnect on version / part numbers. I purchased this to replace my recently deceased but very heavily used Aquabot T4RC. I was nervous to purchase this unit because there was very little feedback and information to illustrate its long-term value. Obviously the jury will be out on this for some time. I’ll be trying out the daily automation routine through the weekend to see how it does. The phone Bluetooth remote control works SOMEWHAT better than the wonky remote on my old T4RC
We inherited a Polaris pressure cleaner with our pool when we moved into our house a couple of years ago. The Polaris cleaner did a decent job, but it was rather dated, and had have a couple of cons that were rather annoying. One was that it always seemed to get stuck on our ladder in the deep end (despite putting the guards in that side of the ladder). This meant that we had to manual extract it from this location several times during the course of a cleaning. Two, it always missed several spots that we either ignored, more manually vacuumed when the cycle completed. To make life easier, we decided to splurge on the Dolphin Sigma, which seemed to have a lot of modern bells and whistles. I have to admit, it does a better job than the pressure vacuum in less time while using less energy. However, we still have the same two issues as before. Now, instead of the ladder, it gets stuck several times a cycle on the drain cap on the bottom of the shallow end which requires manual extraction (picture). This means that we can't really run it when we aren't home, and can't use any of the auto features. Like the pressure vacuum, it also misses several locations during a cleaning cycle. The remote control feature seems like it should be a solution to this issue, but we haven't been able to actually make that work yet. I would give it five stars if it hit all spots and didn't get repeatedly get stuck on a standard drain cap on the bottom, so I removed a star for each of these two reasons....which was why we decided to explore such an expensive option in the first place.
