Dolphin Sigma robotic pool cleanerCorded waterline~$2,999

Dolphin

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

Pool fit

No cable length published

Filtration

No micron figure published

Retrieval

You fish out 24.6 lb

the maker lists no self-parking, so it comes out from wherever the cycle ended, full of water

Default cycle

150 min cycle

Cost per swim season

$1,000

price ÷ warranty years; a floor, not a lifespan

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, one of only three suction figures anyone publishes in this catalog

What it gives up

  • The most expensive corded robot in the catalog
  • Published weight, suction and dimensions match the $1,349 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

Owners who paid for the most expensive corded Dolphin talk about the Sigma in extremes: either it just works, or it stopped for no clear reason and the repair process became the story.

The robot itself gets little criticism from owners whose unit is healthy — the app is the only recurring gripe. The failures owners describe are intermittent stops and sticking on drains, and the frustration is mostly with the turnaround for warranty repair.

Its market is the buyer who wants Maytronics' three-year warranty and app control in one robot and can live without it for a while if it ever has to go back.

What owners like

  • Owners whose units work say they work well: one with a 23,000-gallon gunite pool reports it running great since the pool was finished.
  • Maytronics has stood behind warranty claims for some owners — one had a Sigma replaced under warranty, and another's got an added active brush bar and new internals after it kept sticking on drains.
  • Owners who keep one grow attached to it: one who inherited a Sigma from their grandparents says they have loved it, drain troubles and all.

Common complaints

  • Some units stop working at random, and repairs mean shipping it to Maytronics and going without a robot for weeks or months.
  • Owners in 2024 described service that did not answer the phone or return callbacks while their Sigma was away for repair.
  • The app is the weak part even for satisfied owners.
  • At least one owner's Sigma kept getting stuck on the pool's drains until Maytronics modified it.

Questions owners ask about the Dolphin Sigma

Is the Dolphin Sigma worth it for a small pool?

An owner with a 14 × 28 ft vinyl pool asked exactly this and bought one; owners of larger gunite pools report it working well. The price is the main argument against it for a small pool.

What happens if my Sigma breaks?

Owners describe shipping it to Maytronics for warranty repair and waiting weeks to months. Some got replacements or upgraded parts; others struggled to reach support.

Does the Sigma get stuck on drains?

One owner's did, and Maytronics added a middle active brush bar and replaced most of the internals to fix it.

Others in the same part of the catalog

Dolphin Premier robotic pool cleaner
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

Dolphin S300 robotic pool cleaner
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

More from Dolphin →

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