Dolphin~$2,499
Dolphin Premier
Corded waterline · 180 min cycle
- Pool fit
- No cable length published
- Filtration
- No micron figure published
- Retrieval
- You fish out 20.3 lb
- 3-year warranty
- 3 h cycle
- No app
Cleans: Floor, walls, waterline
Corded waterline~$2,999Dolphin
Dolphin Sigma
Maytronics' dearest residential corded robot on its US store. The Sigma adds a three-year warranty and app control to a 2.5-hour, 50-foot waterline cycle, with fine and ultra-fine filter kits in the box. The numbers Maytronics publishes for it — weight, flow, dimensions — are otherwise the same as the CC Supreme's.
Approx. price
~$2,999
snapshot, not a live price
No cable length published
No micron figure published
You fish out 24.6 lb
the maker lists no self-parking, so it comes out from wherever the cycle ended, full of water
150 min cycle
Best for: Buyers paying for Maytronics' longest warranty on an app-controlled corded robot
Specifications
- Approx. price
- ~$2,999
- Type
- Corded waterline
- Power
- Corded
- Cleans
- Floor, walls, waterline
- Maker's pool claim
- 50 ft
- Default cycle
- 150 min
- Filter
- Fine filter kit, plus an ultra-fine kit in the box
- Weight
- 24.6 lb
- Retrieval
- You fish out 24.6 lb
- App control
- Yes
- Pool types
- in-ground
- Warranty
- 3 years
- Cost per swim season
- $1,000 floor
A specification not listed here is one Dolphin does not publish for this model. It is left blank rather than estimated or borrowed from a sibling.
Features
- 2.5-hour default cycle
- App control and weekly timer
- Fine and ultra-fine filter kits
- Waterline scrubbing
- Three-year warranty
What it does well
- Three-year warranty with app control, a pairing no other corded Dolphin here offers
- Fine and ultra-fine kits in the box, as with the CC Supreme, whose published dimensions it matches
- Waterline scrubbing with a swivel, so the cable stays untangled through 2.5-hour runs
- Rated at 4,500 gph, a suction figure most makers in this catalog never publish
What it gives up
- The most expensive corded robot in the catalog
- Published weight, suction and dimensions match the $1,099 CC Supreme's; the gap is warranty and brushes
- 24.6 lb, tied with the CC Supreme as the heaviest corded Dolphin
- No filter-full light, which the cheaper Premier and Explorer E50 both have
- No caddy is listed in the box at this price
The two lists above come from the maker’s own specifications and this site’s arithmetic on them, not from owner reports. Where owner discussion has been read it appears in its own section below, so the two are never mistaken for each other.
What owners say
The Sigma is the most expensive residential corded robot on Maytronics' US store, sold with a three-year warranty and app control. Most owners who describe one like it, calling it excellent, worth its price or the best robot they have had, and one replaced a pool service with it.
In daily use, one owner says it cleans the floor, walls and waterline thoroughly, another that it leaves the water clear, and a third-year owner in 2024 left it in the pool between runs with new foams each year. Drains are the complaint that recurs from 2024 to 2026, and two owners who like the robot fault its app.
Failures owners describe include a unit that stopped at random in 2024, one that kept quitting about 30 seconds after startup in 2026, and, in a 2025 account, a power supply that died within months. Repairs mean shipping it to Maytronics, and waits of a month or more came with support that was hard to reach, though some owners got rebuilt or replacement robots. It suits a buyer who wants the long warranty and can manage without the robot for a while.
What owners like
- Owners in 2024 called theirs excellent, said they were very happy with it or loved it, and in March 2026 an owner with a 23,000-gallon gunite pool said it had run very well since the pool was finished the previous September.
- A two-year owner said in 2024 that it does a good job on the floor, walls and waterline, and that its cleaning comes across as thorough even though its route sometimes looks random.
- After a Zodiac and a Kreepy Krauly, one owner found the Sigma the best of the three by a wide margin, worth its high price, and says it leaves the water clear.
- An owner who has had one for years replaced a pool service with the Sigma and a WaterGuru, and says that has saved money over time and left the pool much cleaner.
- Maytronics has made good on some warranty claims: by 2024 one owner's Sigma had been replaced with a Nautilus, to that owner's satisfaction, and another's had come back with an added middle brush bar and nearly all new parts.
Common complaints
- Two owners describe a Sigma that stops working: in 2024 one quit at random, which that owner suspected came from the power supply's Wi-Fi failing to reach Maytronics' cloud, and in 2026 another kept stopping about 30 seconds after startup.
- For two owners, repairs were slow and support hard to reach: in 2024 one heard nothing a month after sending a Sigma in, with calls and web chat unanswered, and in 2025 another waited over a month for a replacement power supply.
- Drains are a recurring snag: owners in 2024 said theirs got stuck on floor drains or a drain cover, and in 2026 one owner switched from a Sigma that kept hanging up on drains to a Dolphin Quantum Pro.
- The app disappoints two owners who like the robot: in 2026 one said the app falls short while the robot itself works very well, and in 2024 another called steering it over Wi-Fi a gimmick.
- Even a satisfied two-year owner had to mail it in for warranty repair twice by 2024, and the cables inside its tether came loose a couple of times.
Questions owners ask about the Dolphin Sigma
Is the Sigma too much robot for a small vinyl pool?
A shopper with a 14 x 28 ft vinyl pool asked exactly that in March 2026, along with whether it would be too rough on the liner, and then bought one during a sale. For scale, one owner runs it in a 23,000-gallon gunite pool and says it works very well.
What happens if my Sigma breaks?
It ships back to Maytronics. By 2024 one owner's had come back with nearly all new parts, which that owner thought worth paying the shipping for, and another owner's had been replaced with a Nautilus. Waits can be long: in 2024 one owner heard nothing for a month after sending a Sigma in, and in 2025 another waited over a month for a power supply, though Maytronics added a couple of months to that warranty.
Does the Sigma get stuck on drains?
It can. Owners in 2024 described it sticking on floor drains or a drain cover, and Maytronics answered one owner's drain trouble by adding a middle brush bar and replacing most of the internals under warranty. In 2026 one owner replaced a Sigma that kept snagging on drains with a Dolphin Quantum Pro.
Can the Sigma stay in the pool between runs?
Owners differ. One in a third year with the Sigma in 2024 left it in until swim time and replaced the foams yearly, seeing only some cord discoloration and drain-cover sticking; another lifts it out after every run and rinses it in fresh water.
When is the Sigma cheapest?
One buyer got one on a deal in March 2026 for about $1,700, before what that buyer called seasonal pricing. That June another shopper saw it at $2,600 online and was told prices usually run about half off from January to March. In 2025 a shopper found a refurbished one with under 30 hours of use and a three-year warranty listed at $899, and asked whether the seller was legitimate. List price is $2,999.
Others in the same part of the catalog
Dolphin~$1,499
Dolphin S300
Corded waterline · 120 min cycle
- Pool fit
- No cable length published
- Filtration
- No micron figure published
- Retrieval
- You fish out 18.5 lb
- Caddy included
- 2-year warranty
- Waterline scrub
Cleans: Floor, walls, waterline
Dolphin~$1,329
Dolphin Explorer E50
Corded waterline · 120 min cycle
- Pool fit
- No cable length published
- Filtration
- No micron figure published
- Retrieval
- You fish out 19.2 lb
- 2-year warranty
- Filter-full alert
- 3 cycle lengths
Cleans: Floor, walls, waterline