Dolphin Sigma
$2999
$2349
Save $650
3 years manufacturer warranty
Dolphin Sigma vs Dolphin Nautilus EON 120D
A side-by-side comparison of the Dolphin Sigma and Dolphin Nautilus EON 120D — price, filtration, cleaning coverage, brushes and warranty — to help you pick the right Dolphin robotic pool cleaner.
Dolphin Nautilus EON 120D
$1199
1 year manufacturer warranty
| Feature | Sigma | Nautilus EON 120D |
|---|---|---|
| Overview | ||
| Price | $2999$2349 | $1199 |
| Lineup | ProLine™ | Nautilus™ (cordless) |
| Best for | The most advanced clean | Longest cordless runtime |
| Pool size | Up to 50 ft | Up to 50 ft |
| Cleaning coverage | Floor + Walls + Waterline | Floor + Walls + Waterline + Steps |
| Cleaning cycle | 2.5 hours | Up to 4.5 hours per charge |
| Suction | 4,500 GPH | Battery powered |
| Scrubbing brushes | 2 (Active brushes) | 1 (active) |
| Filtration | NanoFilters™ | Multi-layer top-load cartridge |
| Standout features | ||
| Waterline cleaning | Included | Included |
| 3-year warranty | Included | No |
| NanoFilters™ included | Included | No |
| App control | Included | Included |
| Anti-tangle swivel | Included | No |
| Corded power | Included | No |
| Commercial-grade motors | Included | No |
| Navigation & ownership | ||
| Navigation | SmartNav 3.0™ with gyroscope | Smart Navigation with edge return |
| Weekly scheduling | Weekly timer | Scheduling in the app |
| App control | myDolphin Plus (Wi-Fi and Bluetooth) | MaytronicsOne (Wi-Fi) |
| Cable | 55 ft with anti-tangle swivel | None (cordless) |
| What is included |
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|
| Warranty | 3 years | 1 year |
Dolphin Sigma vs Dolphin Nautilus EON 120D: how they compare
The Dolphin Sigma is part of the ProLine™ lineup — the most advanced Dolphin ever, with a gyroscope and app control. It cleans pools up to 50 ft with floor + walls + waterline coverage and NanoFilters™ filtration, backed by a 3-year warranty.
The Dolphin Nautilus EON 120D is part of the Nautilus™ (cordless) lineup — the step-up cordless Nautilus: up to 4.5 hours per charge, five cleaning modes and automatic edge return. It handles pools up to 50 ft with floor + walls + waterline + steps coverage and Multi-layer top-load cartridge filtration, backed by a 1-year warranty.
Our verdict: the Dolphin Sigma wins
The Dolphin Sigma is our pick. As part of the ProLine™ — one of our two top-recommended lineups — it steps ahead of the Dolphin Nautilus EON 120D with floor + walls + waterline coverage, NanoFilters™ filtration and a 3-year warranty.
The Dolphin Nautilus EON 120D is the cheaper option at $1199, but the step up to the Dolphin Sigma buys a meaningfully better clean and longer coverage that's well worth it.
Not sure yet? We're here to help
Every Dolphin Max-Series™ and ProLine™ robotic pool cleaner ships free and is backed by a full manufacturer warranty — explore our top-recommended robots and find the right fit for your pool.
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