Dolphin Nautilus EON 120D Cordless Robotic Pool Cleaner
- Up to 4.5 hours of runtime — nearly double the EON 100
- Five modes: floor, waterline, regular, smart run and eco
- Multi-layer cartridge filtration for ultra-fine debris
- Automatic edge return for easy retrieval
- Covers stairs, corners and shallow areas
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Get Expert HelpWhat the Dolphin Nautilus EON 120D does well
CORDLESS POWER WITH APP CONTROL: Enjoy the hassle-free Nautilus EON 120d cordless pool cleaning with powerful suction and built-in Wi-Fi connectivity. Use the MaytronicsOne app to start, stop, schedule, and customize cleaning modes when your EON is out of the water.
FULL POOL COVERAGE CLEANING: Advanced navigation and strong traction allow the cleaner to scrub floors, walls, waterline, stairs, corners, and shallow sun ledges (down to 8 in.), areas many robotic cleaners miss.
UP TO 4.5 HOURS OF RUNTIME WITH MULTIPLE CLEANING MODES: Choose from floor-only, waterline-only, regular cleaning, smart run, or eco mode to match your pool’s cleaning needs while maximizing battery efficiency.
MULTI-LAYER FILTRATION FOR CRYSTAL-CLEAR WATER: Advanced cartridge filtration captures ultra-fine debris and larger particles that cloud water, helping maintain clear water and reduce strain on your pool’s main filtration system.
SMART NAVIGATION WITH AUTOMATIC EDGE RETURN & EASY RETRIEVAL: Intelligent scanning maps the pool for consistent coverage, then returns the cleaner to the pool edge at the end of the cycle for quick and effortless removal.
The EON 120D is the EON 100 with the two things that model most needed: a much bigger battery and finer filtration. 4.5 hours of runtime removes the main practical limit on cordless Dolphin cleaning.
Runtime changes what's possible
At 2.5 hours a cordless robot is racing the clock on a 50 ft pool. At 4.5 hours it can do a genuine full pass with margin, or run an eco cycle for most of a day. That's the difference between a machine you plan around and one you don't think about.
Five modes
Floor-only, waterline-only, regular, smart run and eco. Waterline-only is the underrated one: when the floor is fine and only the tile band has gone grey, you can send it straight at that and use a fraction of the battery.
Filtration
Multi-layer cartridge filtration captures the ultra-fine particles that cloud water alongside the larger debris — a step up from the plain basket on the EON 100.
Worth knowing before you buy
Review volume remains low and the average middling. The Dolphin Liberty 300 and 400 in our range are the cordless Dolphins we'd recommend first, with our own support behind them.
Dolphin Nautilus EON 120D specs
| Model Name | Nautilus EON 120D |
|---|---|
| Material | Acrylonitrile Butadiene Styrene (ABS), Plastic |
| Color | Black and Blue |
| Power Source | Battery Powered |
| Other Special Features of the Product | Lightweight |
| Control Method | App |
| Efficiency | High Efficiency, Fast Cleaning, Energy Efficient |
| Battery Description | Lithium-Ion |
| Installation Type | robotic |
| Item Dimensions L x W x H | 17.69"L x 16.2"W x 11.15"H |
| Model Number | Nautilus EON 120D |
| Manufacturer Part Number | Nautilus EON 120D |
| GTIN | 810071228605 |
Dolphin Nautilus EON 120D vs the rest of the Dolphin range
Every Dolphin cleaner we track, side by side. Prices are from our most recent check.
| Model |
Dolphin
Dolphin Nautilus AG
$568.00
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|
Dolphin
Dolphin Proteus DX1
$569.00
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|
Dolphin
Dolphin Premium 20
$639.99
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|
Dolphin
Dolphin Echo M1
$669.99
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|
Dolphin
Dolphin Explorer E25
$888.00
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|
Dolphin
Dolphin Nautilus CC Pro
$899.00
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|
Dolphin
Dolphin Proteus DX4 Plus
$899.00
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|
Dolphin
Dolphin Advantage Ultra
$899.00
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|
Dolphin
Dolphin Nautilus EON 100
$899.00
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|
Dolphin
Dolphin Advantage Pro
$999.00
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|
Dolphin
Dolphin Explorer E40
$1149.00
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|
Dolphin
Dolphin Proteus DX5i
$1199.00
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|
You're viewing
Dolphin Nautilus EON 120D
$1199.00
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|
Dolphin
Dolphin Nautilus Titan
$1299.00
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|
Dolphin
Dolphin Wave 140
$7879.00
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|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Power | Corded | Corded | Corded | Corded | Corded | Corded | Corded | Corded | Cordless (battery) | Corded | Corded | Corded | Cordless (battery) | Corded | Corded (commercial) |
| Pool size | Above-ground | In-ground | In-ground | In-ground up to 33 ft | In-ground up to 50 ft | In-ground | In-ground up to 33 ft | In-ground up to 43 ft | In-ground up to 50 ft | In-ground | In-ground | In-ground | In-ground up to 50 ft | In-ground | Large commercial |
| Coverage | Floor | Floor | Floor & walls | Floor & walls | Floor & walls | Floor & walls | Floor, walls, waterline, steps & ledges | Floor, walls & waterline | Floor, walls, waterline, steps & ledges | Floor, walls & waterline | Floor, walls & waterline | Floor, walls & waterline | Floor, walls, waterline, stairs & corners | Floor, walls & waterline | Floor |
| Control | Touch / plug-and-play | Plug-and-play | Plug-and-play | One-button | MyDolphin Plus app | App (Wi-Fi) | Remote | Touch | MyDolphin Plus app | MyDolphin Plus app | MyDolphin Plus app | MyDolphin Plus app | MyDolphin Plus app | MyDolphin Plus app | Remote |
| Filtration | Top-load filter basket | Top-load filter basket | Top-load filter basket | Single-level, rinse-clean | Top-load filter basket | Top-load filter basket | Large top-load basket | Top-load filter basket | Top-load filter basket | Top-load filter basket | Top-load filter basket | Top-load filter basket | Multi-layer cartridge | Ultra-fine top-load basket | Top-load fine cartridge, full indicator |
| Cycle / runtime | 1.5 hours | Standard | Continuous corded power | Standard | Scheduled or on demand | Scheduled or on demand | Continuous corded power | Continuous corded power | Up to 2.5 hours | 1-hour quick clean | Scheduled or on demand | Scheduled or on demand | Up to 4.5 hours | Scheduled or on demand | Up to 6 hours |
| Weight | 14.6 lb | 14.6 lb | 23.3 lb | — | 34.1 lb | 16.5 lb | 18.5 lb | — | — | — | 40.2 lb | 17.4 lb | — | — | — |
| Amazon rating | 4.4 (6377) | 3.5 (3) | 3.9 (110) | 4.1 (36) | 2.9 (92) | 3.3 (565) | 3.9 (1625) | 3.7 (113) | 2.8 (40) | 3 (28) | 3.3 (16) | 4 (258) | 3.3 (21) | 3.2 (163) | 1 (1) |
| Best for | Above-ground pools, with thousands of reviews behind it | The lightest Dolphin here at 14.6 lb | Straightforward wall climbing with no app | Compact in-ground pools up to 33 ft | Wi-Fi wall climbing on pools to 50 ft | Wi-Fi scheduling on the proven Nautilus platform | Steps and sun ledges, not just floors and walls | Waterline scrubbing on pools up to 43 ft | Cordless Dolphin coverage including steps | A 1-hour quick-clean cycle | Awkward pool shapes, thanks to Dual Drive | The best-reviewed Dolphin on this page | The longest runtime of any cordless Dolphin | Full wall-to-waterline coverage with app control | The largest commercial pools |
Dolphin Nautilus EON 120D FAQ
Do you sell the Nautilus EON 120D?
No. For a cordless Dolphin we sell and support directly, see the Liberty 300 or Liberty 400.
How long does it run?
Up to 4.5 hours, depending on the mode — roughly double the EON 100.
What cleaning modes does it have?
Five: floor-only, waterline-only, regular cleaning, smart run and eco.
Cleaners we sell and support directly
We don't stock the Dolphin Nautilus EON 120D. These are the closest cleaners we do — bought from us, supported by us.
Pair it with ICO — the smart water monitor
Your robot handles the floor, walls, and waterline. ICO watches the water itself — analyzing it 24/7 and telling you exactly what to add, in what amount, at the right time.
- Measures pH, ORP, and water temperature every hour
- Personalized treatment recommendations in the iOS & Android app
- Anticipates water changes with AI and local weather data, minimizing chemical use
- Versions for chlorine/bromine and salt water pools (salt also tracks TDS)
ICO - The Smart Pool Water Monitor
Real-time water analysis with personalized dosing recommendations — so the water stays as balanced as the pool is clean.