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Robot Autonomy, Classified
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Ownership burden/Robot Pool Cleaners/4 robots compared/Reviewed Jun 2026

Corded Dolphin repair costs and longevity: which model lasts longest?

$1,659 to $3,1494-year total. Purchase price is between 66% and 79% of what these machines actually cost to run.
Maytronics Dolphin Proteus DX4View recordMaytronicsIIDolphin Proteus DX44-year total$1,659$1,099
Maytronics Dolphin M600View recordMaytronicsIIIDolphin M6004-year total$2,439$1,899
Maytronics Dolphin M700View recordMaytronicsIIIDolphin M7004-year total$3,149$2,499
Maytronics Dolphin QuantumView recordMaytronicsIIIDolphin Quantum4-year total$2,029
Full specifications12 measurements · 43 of 48 documented
MSRP
$1,099
$1,899
$2,499
$1,549
Navigation
Scanning coverage pattern; mode selection and weekly timer on the power supply, no app and no map.
CleverClean scanning navigation: surveys pool geometry and plans a route across floor, walls, and waterline
Grid mapping with gyroscope assistance; cycle selection and manual steering through the MyDolphin Plus app
Systematic scanning path; no cameras and no stored map. Maytronics publishes no navigation-system name for this SKU.
Connectivity
Not documented
wifi, bluetooth
wifi, bluetooth
Not documented
Dimensions (W×D×H)
15.8 × 17.5 × 11.4 in
15.8 × 17.4 × 12.5 in
12.6 × 14.6 × 12.1 in
15.7 × 17.5 × 11.6 in
Weight
18.5 lbs
24.3 lbs
25.4 lbs
18.3 lbs
Readiness
Ready Now
Ready Now
Ready Now
Ready Now
Released
Mar 2019
Jan 2019
Jan 2021
Jun 2016
Cycle length
120 minutes
120 min
120 min
120 min
Max pool length
50 ft
50 ft
49.2 ft
50 ft
Surfaces cleaned
Floor, walls and waterline
Floor, walls and waterline
Floor, walls and waterline
Floor, walls and waterline
Power type
Corded
Corded
Corded
Corded
Cable length
60 ft
Not documented
Not documented
Not documented

Four-year cost of ownership

What each robot actually costs to own

Purchase price plus documented consumables, subscription gating, and replacement events. Bars share one dollar scale, so length is directly comparable. Costs are typical, drawn from manufacturer maintenance guides and owner reports.

PurchaseConsumablesRepairs

Maytronics Dolphin Proteus DX4$1,099 purchase
$1,6594-year total+$560 past purchase
  • MSRP$1,099
  • Brush pairs (4 yr)$320
  • Filter cartridge (annual)$160
  • Swivel service (2x)$80

Maytronics Dolphin Quantum$1,549 purchase
$2,0294-year total+$480 past purchase
  • MSRP$1,549
  • Filter cartridges (annual ~$55)$220
  • Brush service (4 yr)$180
  • Swivel service (2x)$80

Maytronics Dolphin M600$1,899 purchase
$2,4394-year total+$540 past purchase
  • MSRP$1,899
  • Filter media (annual ~$45)$180
  • Swivel replacement (2x)$130
  • Brush service (4 yr)$230

Maytronics Dolphin M700$2,499 purchase
$3,1494-year total+$650 past purchase
  • MSRP$2,499
  • Dual-filter media (annual ~$135)$540
  • Chamber seal service (2x ~$95)$110

Documented failure events

When things break, and what they cost

Field-reported failures placed on the ownership timeline, with associated repair or replacement costs. Sourced from owner forums and manufacturer service documentation.

Month 10 · Dolphin Proteus DX4Minor

Brush bristle shedding accelerates with algae load

$80 (brush pair replacement)

Owner reports on r/pools document accelerated bristle shedding when cartridge cleaning is delayed. Brushes reach replacement threshold 8-10 months into seasons with above-average algae; manufacturer lists 12-month interval under standard use.

r/pools owner reports; Maytronics maintenance guide
Month 14 · Dolphin M600Minor

Cable swivel tangling without lubrication

$40-65 (swivel assembly) or $0 DIY clean

Owner reports consistently document tangling at 8-16 month intervals without preventive lubrication. DIY cleaning and lubrication extends swivel life by 2-4 months; replacement assembly runs $40-65 if tangling is left unaddressed.

r/pools M600 threads; pool equipment supplier docs
Month 18 · Dolphin M600Major

Cable insulation degradation in freeze-thaw climates

varies ($80-180 cable replacement)

Owner reports from northern climates document cable insulation failures within 18-24 months when the cable is left submerged through freeze-thaw cycles. Manufacturer maintenance guide recommends removal before first freeze; owners who skip this step report cracking and intermittent power loss.

r/pools M600 owner reports; Maytronics M600 maintenance guide
Month 22 · Dolphin QuantumMinor

Oversized basket seal compression over multiple seasons

$45-65 (basket cartridge replacement)

The Quantum's oversized filter basket runs 2-3 weeks between empties, but basket seal compression is documented in owner forums after 18-24 months of regular seasonal use. Replacement baskets run $45-65; seal degradation is gradual and owner-detectable before complete failure.

Reddit r/pools Quantum thread; Maytronics owner forums
Month 26 · Dolphin M700Major

Dual-filter chamber seal replacement

$85-110 (chamber seal recondition)

M700 maintenance documentation lists annual dual-filter chamber seal inspection with replacement or reconditioning at $85-110. At 24-26 months, manufacturer-documented first replacement interval arrives; owners who skip this step report pressure-reading inconsistencies in one chamber.

Maytronics M700 maintenance documentation; press field reports
Month 30 · Dolphin Proteus DX4Minor

Salt-cell corrosion in saltwater pool installations

$150-200 (salt-cell replacement)

For DX4 units in saltwater pool installations, owner reports and manufacturer guidance document accelerated salt-cell corrosion requiring replacement at 18-24 months rather than the 24-36 months typical in freshwater pools. Non-saltwater installations do not encounter this failure mode.

Maytronics DX4 product FAQ; DX4 owner reports

Consumables breakdown

Annual cost by part type

Read from each robot’s own record, not restated here. A part is priced only from the manufacturer’s published price for a part its own page lists for that machine, and costed only where a replacement interval has been established. Anything else is left unpriced rather than estimated.

Part · frequencyMaytronics Dolphin Proteus DX4Maytronics Dolphin M600Maytronics Dolphin M700Maytronics Dolphin Quantum
FilterAnnuallyNot priced$125 / yrNot pricedNot priced
Annual totalNot establishedno parts recorded$124.99 / yrcovers 1 itemized partNot establishedno parts recordedNot establishedno parts recorded

Common questions

What readers ask about this comparison.

Q.
Which corded Dolphin has the lowest annual consumables cost?
The Quantum’s oversized basket reduces filter-emptying to every 2-3 weeks, running roughly $115-130 per year in consumables under standard seasonal use. The DX4 is comparable for non-saltwater pools; saltwater installations push DX4 costs to $290-380 due to salt-cell replacement. Maytronics maintenance guides and r/pools owner reports document these intervals.
Q.
Is cable swivel replacement a one-time or recurring cost?
Recurring. Owner reports document swivel tangling at 8-16 month intervals across M600 and Quantum without preventive lubrication. DIY cleaning extends the interval; eventual replacement ($40-65 for M600) is documented across all four models. The M700 adds monthly swivel inspection to its published maintenance schedule.
Q.
Does the M700's dual filtration meaningfully increase annual costs?
Yes. M700 dual-mode filter media runs $120-150 per year versus $40-45 for M600’s single cartridge. M700 chamber seals add $22-28 annually. Over four years, M700 filter costs accumulate roughly $540; M600 reaches roughly $180. Maytronics parts documentation and pool-retailer pricing support these figures.
Q.
When does repairing a corded Dolphin become less practical than replacing?
Motor and drive-train failures mark practical end-of-life. Cable, swivel, brush, and filter replacements remain cost-effective for 5-8 years. Owner reports on r/pools describe motor winding failure as the typical repair-vs-replace decision point. Parts availability from Maytronics has remained consistent through 2026 for models back to the Quantum’s 2016 introduction.
Q.
Does the Quantum's superseded status affect parts availability?
The Quantum was superseded by the Dolphin Sigma per Maytronics records. Supersession does not immediately affect parts availability; Maytronics historically maintains consumable supply for corded models for several years post-discontinuation. Confirm current filter cartridge and brush availability with Maytronics or authorized retailers before committing to a multi-season maintenance plan.
Next up

Floor-only vs floor-and-waterline pool robots: which surfaces do they actually reach?

Read the comparison
Comparison ID: RV–CMP–7501 · Last reviewed Jun 23, 2026 · Based on owner reports, manufacturer documentation, and firmware release notes