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Comparison · 2 robots

Maytronics Dolphin Nautilus Titan · Pentair Prowler 920

All robot pool cleaners. Every measure below is plotted against the full class, so a difference can be read against how much the class itself varies.

Maytronics Dolphin Nautilus Titan
Pentair Prowler 920

Maytronics

Maytronics Dolphin Nautilus Titan

Autonomy: IIAssisted Autonomy
Score: Not scored
Readiness: Not assessed
Price: $1,599list

Pentair

Pentair Prowler 920

Autonomy: IIAssisted Autonomy
Score: 65/100 Capable
Readiness: Not assessed
Price: $1,349list

Up to three

01 Classification

What each one does on its own.

The Autonomy Ladder is the same five rungs for every robot on the site. A rung describes the conditions a robot handles without you, not how good it is.

V

Generalized

Any task, any setting

IV

Environmental

Handles new obstacles without help

III

Conditional

Finishes familiar jobs on its own

II

Assisted

Runs preset routines, needs rescue

Maytronics Dolphin Nautilus TitanPentair Prowler 920

I

Manual

One action, on command

02 Assessment

Where they actually differ.

The Robovations Score is nine inputs across three pillars, each weighted as shown and each scored so that more is better. A robot can lead on one and trail on another, which is the point of showing them apart. Cost of ownership and data handling are reported on each robot's own page and are never averaged into the score.

Capability

Task completion16% of score

Does it finish the job it is sold to do, unattended

65

Pentair Prowler 92065

18median 72 across 433 scored robots100

Not scored: Maytronics Dolphin Nautilus Titan

Coverage and navigation10% of score

Does it work the whole area, and hold that between runs

42

Pentair Prowler 92042

0median 70 across 421 scored robots100

Not scored: Maytronics Dolphin Nautilus Titan

Edge-case recovery10% of score

Does it recover from the failures its category presents

25

Pentair Prowler 92025

18median 52 across 320 scored robots100

Not scored: Maytronics Dolphin Nautilus Titan

Operating envelope4% of score

How far conditions can vary before performance drops

65

Pentair Prowler 92065

28median 68 across 397 scored robots100

Not scored: Maytronics Dolphin Nautilus Titan

Dependability

Field failure rate16% of score

Documented hardware failures per owner-year

96

Pentair Prowler 92096

6median 70 across 359 scored robots100

Not scored: Maytronics Dolphin Nautilus Titan

Software stability14% of score

Whether updates fix more than they break

33

Pentair Prowler 92033

15median 65 across 342 scored robots100

Not scored: Maytronics Dolphin Nautilus Titan

Support longevity10% of score

Committed parts, service and updates, with dates

73

Pentair Prowler 92073

0median 62 across 429 scored robots100

Not scored: Maytronics Dolphin Nautilus Titan

Ownership burden

Routine maintenance12% of score

Hands-on time it asks for in normal operation

67

Pentair Prowler 92067

22median 67 across 434 scored robots100

Not scored: Maytronics Dolphin Nautilus Titan

Consumables8% of score

Parts that must be bought to keep it working

86

Pentair Prowler 92086

8median 69 across 434 scored robots100

Not scored: Maytronics Dolphin Nautilus Titan

03 Measured against the class

How far apart is a long way?

A number only means something next to the spread it sits in. Each track below is the real range across every classified robot in the class, with the median marked.

Price69 with a published figure

$1,599$1,349

Maytronics Dolphin Nautilus Titan$1,599
Pentair Prowler 920$1,349

$299median $1,249$4,250

Weight65 with a published figure

22.6 lbs16 lbs

Maytronics Dolphin Nautilus Titan22.6 lbs
Pentair Prowler 92016 lbs

7.9 lbsmedian 20.8 lbs46.3 lbs

Height60 with a published figure

12.5 in13 in

Maytronics Dolphin Nautilus Titan12.5 in
Pentair Prowler 92013 in

3.8 inmedian 10.6 in29.9 in

Not compared, because fewer than two of these robots carry a published figure: Suction, Runtime, Charge time, Noise.

04 Ownership

What the numbers leave out.

The trade-off

What each design gives up to be good at what it is good at.

Maytronics Dolphin Nautilus Titan

A 50 ft rating and waterline scrubbing at $1,599, with a 1-year warranty and no independent test behind either claim.

Pentair Prowler 920

Self-contained filtration keeps debris out of the pool’s own pump and filter, but the basket has to be lifted and rinsed by hand after every run.

Who each one is wrong for

Stated by the record itself. A robot being wrong for a household is a fact about fit, not a fault.

Maytronics Dolphin Nautilus Titan

Above-ground pool owners: Maytronics classifies the Nautilus Titan for in-ground pools only.
Buyers who want independent test results first: No hands-on review was found; the only independent coverage found is a Pool Magazine deals roundup.
Owners who want a full-filter warning: Maytronics' spec table lists no full filter indicator, so the filter has to be checked by eye.
Buyers wanting a longer warranty: Maytronics lists a 1-year warranty for the Nautilus Titan.

Pentair Prowler 920

Pools beyond the 60 ft cord's reach: Coverage is bounded by the 60 ft floating cord measured from the poolside outlet, and the cord cannot be extended. Pentair publishes no gallon rating for the Prowler line, so size the cleaner by the run from the outlet to the far end of the pool rather than by volume.
Above-ground pools: The 920 is an in-ground cleaner. Pentair's above-ground model in the same line is the Prowler 910. In-ground surfaces are not a constraint: gunite, vinyl and fiberglass are all supported.
Buyers who need a model still in production: Pentair's product page now marks the Prowler 920 discontinued. Dealer and retailer stock is still in circulation and Pentair parts distribution covers the model, but new-unit supply depends on what remains in the channel.

What stays your job

The upkeep ownership hands back to you, whatever the autonomy level says.

Maytronics Dolphin Nautilus Titan

After every use: Lift the robot out using pick-up mode and empty the top-access filter.
As needed: Switch to the included ultra-fine filter kit for fine debris.
As needed: Check the anti-tangle swivel cable for twists.
As needed: Inspect the two active brushes and replace them when worn.
Seasonally: Rinse and store the robot and power supply out of the sun when the pool closes.

Pentair Prowler 920

After every use: Lift the top and rinse the debris basket with fresh water. Remove the cleaner from the pool before anyone enters the water.
Weekly: Inspect the 60 ft floating cord for kinks or insulation damage and wind it loosely on the caddy or a storage peg.
Seasonally: Rinse the unit with fresh water and store it out of direct sun. Fit the fine or ultra-fine basket if the pool is carrying silt or algae dust.
Annually: Inspect the power supply and cord connections for corrosion, and test the GFCI protection on the outlet the cleaner plugs into.
If the cord shows damage: Replace the cord assembly through an authorized Pentair dealer. Do not splice it and do not run the cleaner on an extension cord; the manual prohibits extension cords, and the outlet must be GFCI protected.

05 Evidence

How much each of these is standing on.

Classifications rest on different depths of evidence. A pre-release assessment and a verified one are not the same kind of claim.

Evidence behind each classification
Robot	Evidence status	Sources reviewed	Last assessed
Maytronics Dolphin Nautilus Titan	Pending	2	Sep 2026
Pentair Prowler 920	Discontinued	4	Sep 2026