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Robot Pool Cleaners

Dolphin Sigma

Maytronics · $999 street (MSRP $1,299) · Launched Apr 2025

Gyroscopic mapping puts the Sigma in systematic-path territory for a corded pool cleaner. Floor, walls, and waterline coverage is documented. The trade-off is the power cord and the filter-basket cadence that comes with heavy-debris pools.

Level III
Conditional Autonomy
4 sources reviewed ·
Ready Now
Ready to own today
Reassessed
Jun 11
View history
Robovations Score
Capable · 64 of 100
Rescored 2026-06-11
Autonomy62 / 100

30% weight

Reliability68 / 100

25% weight

Maintenance52 / 100

15% weight

Value63 / 100

15% weight

Privacy63 / 100

15% weight

Framework

How we score →

Weighted average of 5 reads, 0–100. Scored from documented evidence — we do not lab-test.

Will the Dolphin Sigma work in your pool?

Pick what matches your setup. The fit updates as you go.

Pool type
Pool size
Debris load
Coverage you want
How Dolphin Sigma holds up
Pool type
Pool size
Debris load
Coverage you want
Specifications

The full spec sheet.

Manufacturer-published values.

Priced below the category median; remaining figures sit mid-range for the class.

Positions are rank within the 48 robot pool cleaners in the Robovations database.

Dolphin Sigma
Maytronics 99996427-USN · Released Apr 2025
This robot’s rank in categoryCategory median
Price$999MSRP $1,299$300$4,250
Weight19lbs7.934.5 lbs
Mapping & navigation

Gyroscopic mapping with systematic floor-wall-waterline path

Official referencesManufacturer supportProduct page
Lifecycle

The record since launch.

4 tracked events since launch
20252026TODAY1234
  1. 1
    ANNOUNCEMENT · NOV 15, 2024Maytronics reveals Dolphin Sigma as 2025 ProLine pool cleaner
  2. 2
    RELEASE · APR 1, 2025Maytronics Dolphin Sigma enters US retail as 2025 ProLine model
  3. 3
    UPDATE · JUL 10, 2025MyDolphin Plus app gains scheduling and remote-start capability
  4. 4
    NEWS · NOV 1, 2025Listed as 2026 ProLine model in retailer catalogs
Ownership & reliability

How it holds up after the purchase.

Owner reports · manufacturer documentation

Established corded platform with consistent coverage; filter basket durability is the primary owner complaint.

Owner reports describe reliable wall-climbing and consistent waterline pass completion. The most commonly documented issue is filter basket seal wear over multiple seasons, leading to debris bypass. Drive track wear is reported after two or more years of regular use.

Owner effort~40 minhands-on time per month
Consumables$80per year, replaceable parts
Reliability trendStableowner-reported arc to date
What goes wrong, and who fixes it
Failure pointLikelihoodResolution
Filter basket seal wearDebris bypasses filter, clouds poolOccasionalOwner fixInspect seal each season; replace basket assembly when worn
Cable tangle on stepsCycle interrupted, manual untangling neededCommonOwner fixReposition power supply; uncoil cable before each cycle
Drive track slippage on curved wallsIncomplete wall coverage, missed waterline sectionsOccasionalOwner fixInspect tracks for debris buildup; clean weekly in heavy-debris pools
Power supply unit faultUnit inoperable until replacedRareOwner fixContact Maytronics support; power supply is replaceable as a standalone unit
Maintenance cadence
Every runEach useafter every cycle

Remove cleaner from pool, open filter basket, rinse debris under a hose. Allows basket to dry before storage.

Weekly52×a year

Inspect drive tracks for embedded debris or grit; clear any buildup to maintain traction on walls.

Monthly12×a year

Check swivel cable connector for kinks or fraying; straighten cable and hang to preserve swivel function.

Seasonally4×a year

Inspect filter basket seal for cracking or deformation; replace if debris bypass is observed.

Winterize by draining internal water passages, storing the cleaner and power supply indoors in a dry location above freezing.

Yearly1×a year

Replace drive tracks if wear affects wall-climbing grip. Replacement track sets run approximately $40-70 depending on retailer.

As neededVariesno fixed cadence

Replace brushes when PVC bristles show visible wear or wall scrubbing coverage declines; brush sets run approximately $20-40.

Safety flags
CautionDo not run with bathers presentManufacturer requires removing the cleaner before swimmers enter the pool.
CautionPower supply water exposureThe external power supply must remain dry and away from pool splash zones during operation.
NoteCable trip hazard on deckThe 60-foot cable on the pool deck is a trip hazard; secure or store when not in use.
Common questions

What buyers actually ask.

6 answered
Operation
Does the Dolphin Sigma work on fiberglass pools, or only plaster?
Manufacturer documentation lists compatibility with gunite, plaster, tile, and fiberglass surfaces. The PVC and rubber brush combination is specified for smooth and textured finishes. Vinyl liner compatibility is not listed.
Ownership
How often does the Sigma's filter basket need cleaning?
Maytronics recommends cleaning the filter basket after each cycle. In pools with heavy leaf loads, owner reports describe basket saturation before the cycle completes, requiring a mid-cycle manual rinse.
Compatibility
Does the Sigma require the MyDolphin Plus app to operate?
No. The Sigma operates via its onboard power supply controls without the app. The MyDolphin Plus app adds scheduling and cycle-length selection but is not required for basic floor-wall-waterline cleaning.
Operation
Will the Sigma's 60-foot cable reach all corners of a 50-foot pool?
Manufacturer specs list a 60-foot swivel cable for pools up to 50 feet. The swivel fitting at the cable entry reduces kinking. Owner reports note that pools with pronounced shallow-to-deep transitions can still produce cable bunching near steps.
Operation
Is the Sigma the same cleaner as the Dolphin Nautilus CC Supreme?
No. The Sigma carries a different model number and is positioned above the Nautilus CC Supreme in Maytronics’ lineup, with gyroscopic mapping and waterline coverage that the Nautilus CC Supreme does not document at the same level.
Operation
Can the Dolphin Sigma handle algae on pool walls, not just floor debris?
Owner reports and manufacturer marketing describe wall-climbing and scrubbing capability. Algae removal depends on brush contact duration and algae severity; the Sigma’s scheduled wall passes provide regular mechanical scrubbing, not chemical treatment.

More in this category

Other robot pool cleaners we have classified.

Aiper Scuba X1 Pro MaxIII
Robot Pool Cleaners

Aiper Scuba X1 Pro Max

In-ground pools 15,000–40,000 gallons, complex geometry, premium automation budget.
Provisional56/100Adequate
Maytronics Dolphin Explorer E70III
Robot Pool Cleaners

Maytronics Dolphin Explorer E70

In-ground pools 15K-30K gallons, heavy debris, hands-off scheduling, full waterline coverage.
Verified67/100Capable
Maytronics Dolphin Triton PSIII
Robot Pool Cleaners

Maytronics Dolphin Triton PS

In-ground pools 12K-25K gallons, algae-prone walls, manual deployment, wall-focused cleaning.
Verified69/100Capable
Maytronics Dolphin Liberty 600III
Robot Pool Cleaners

Maytronics Dolphin Liberty 600

In-ground pools 12,000–35,000 gallons, three-plane coverage, app scheduling
Verified63/100Capable
Cite & embed

Reference the Dolphin Sigma classification.

Embed the Autonomy Ladder™ mark or copy the citation. The mark links back to this assessment and updates if the classification changes.

RobovationsAutonomy Ladder™IIIConditional AutonomyIndependent classification
Citation
Where to next

Three ways to keep going.

For shoppers

Stack against a peer.

Open the compare builder pre-loaded with the Dolphin Sigma and Trifo Lucy — side-by-side score, autonomy, fit profile, and trade-offs.

3 peers ready to stack right now.
For browsers

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Every robot we’ve classified at conditional autonomy — sorted by readiness, score, and price. Filter by category, manufacturer, or release date.

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By RobovationsUpdated: Jun 14, 2026
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