Goal-based
Pool robots for above-ground and small seasonal pools: weight, climb, and storage
All three robots are cordless and Level III, yet weight, depth tolerance, and battery-storage requirements differ enough to matter for above-ground pool owners who lift, store, and winterize every season.
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The investigation
5 questions this comparison examines
How heavy is each robot to lift poolside?
Above-ground pool owners lift the robot over the pool wall every session. Dry weight from manufacturer specs is the baseline; wet robot weight is higher but not separately published.
Maytronics Dolphin Liberty 400Maytronics Dolphin Nautilus EON 100Maytronics Dolphin Liberty 300Liberty 400 and Liberty 300 share a 17.9 lb dry weight per Maytronics product pages. The EON 100's 22.1 lb figure is verified from the US manufacturer spec sheet.
The Liberty 400's compact footprint (13" wide) is the smallest published form factor of the three, a structural advantage for narrow above-ground pool walls and storage bins.
Can each robot climb soft-sided above-ground pool walls?
Above-ground pools often use vinyl or soft-sided walls with rounded top edges. Manufacturer documentation describes wall-climb design for each robot; suitability for non-rigid surfaces involves factors not always addressed in specs.
Maytronics Dolphin Liberty 400Maytronics Dolphin Nautilus EON 100Maytronics Dolphin Liberty 300The EON 100's 8-inch depth limit is a manufacturer-published constraint documented on the Maytronics US product page and CES 2026 disclosure materials; it is the only robot in this set with a published shallow-water restriction.
Liberty 400 manufacturer documentation specifies wall-climb up to the waterline. Owner forum reports (Reddit r/pools) describe successful operation on standard above-ground vinyl walls, though consistent data on soft-sided walls specifically is limited.
What is each robot's runtime and recharge cadence per session?
Seasonal pool owners typically run one cleaning session before storage or before guests arrive. Runtime per charge and recharge duration determine whether a single session covers the pool.
Maytronics Dolphin Liberty 400Maytronics Dolphin Nautilus EON 100Maytronics Dolphin Liberty 300Liberty 300's 150-minute runtime is the longest published figure of the three, verified from the Maytronics US product page; Liberty 400's 126 Wh capacity and 5-hour charge time are documented on the manufacturer spec sheet.
EON 100 charge time is not published in CES 2026 or retail disclosure materials as of June 2026. EON 100 runtime of 120 minutes is manufacturer-published.
How is each robot stored when the pool is drained for the season?
Small and above-ground pools in temperate climates are typically drained and stored for 4-6 months. Battery handling, dock storage, and winterization procedures differ across these three robots.
Maytronics Dolphin Liberty 400Maytronics Dolphin Nautilus EON 100Maytronics Dolphin Liberty 300Liberty 300 uses a magnetic dock, documented by Maytronics; this simplifies poolside storage compared to the Liberty 400's waterline dock, which requires correct waterline positioning each time the pool is refilled.
EON 100 dock type and winterization procedures are not published as of the June 2026 evaluation date; CES material does not address seasonal storage.
What filter maintenance does each robot require between sessions?
Seasonal pool operators often run a robot a handful of times per open season. Per-session filter maintenance requirements determine how much overhead comes with each use.
Maytronics Dolphin Liberty 400Maytronics Dolphin Nautilus EON 100Maytronics Dolphin Liberty 300Liberty 400 includes an onboard backflush button, documented in manufacturer materials, which allows filter cleaning without removing the cartridge. The Liberty 300 and EON 100 use manual rinse procedures per manufacturer maintenance guidance.
Filter cartridge replacement cost estimates of $30-50 for the EON 100 and Liberty 300 are based on Maytronics Dolphin line historical consumable pricing; neither model's exact cartridge cost is published for these specific units.
In closing
What the evidence shows
Patterns that emerged across the questions above.
Weight is a tie; footprint is not
Liberty 400 and Liberty 300 share the same 17.9 lb dry weight, but the Liberty 400's smaller published footprint (13" wide) may matter for owners with tight storage bins or narrow above-ground pool walls. EON 100 is the heaviest at 22.1 lbs.
EON 100's depth limit excludes deep basins
The EON 100's 8-inch depth restriction is a manufacturer-documented hard limit; it targets tanning ledges, not full-pool coverage. Owners with a standard above-ground basin that deepens past 8 inches need one of the other two units.
Off-season storage complexity varies by dock type
Liberty 300's magnetic dock simplifies seasonal reseating versus the Liberty 400's waterline dock, which requires correct placement each refill. EON 100 dock and winterization procedures remain undisclosed as of June 2026.
Common questions