Help me choose
A stronger Pool Express option
Dolphin Nautilus EON 120d and Dolphin Proteus DX4 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Quantum. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
EON
Dolphin Nautilus EON 120d
Inground and above-ground pools up to 50 ft that need whole-pool cordless cleaning with the least filter maintenance.
Proteus
Dolphin Proteus DX4
Inground pools that need floor, wall and waterline cleaning.
What we recommend instead
Dolphin Quantum
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
$1,649
Buy Dolphin QuantumDolphin Nautilus EON 120d or Dolphin Proteus DX4: our take
Dolphin Nautilus EON 120d and Dolphin Proteus DX4 are compared on pool fit, cleaning reach, debris handling, controls and ownership details. The recommendation is based on the job the robot must do—not a simple feature count.
Pool fit and cleaning reach
Dolphin Nautilus EON 120d is intended for inground and above-ground pools, while Dolphin Proteus DX4 is intended for inground pools. Dolphin Nautilus EON 120d has a published maximum pool length of 50 ft; the other model does not have a verified length in our source material. Each cleans floor, walls, and waterline, so coverage alone does not separate them. Dolphin Nautilus EON 120d lists 2 active brushes and SmartMap navigation. Dolphin Proteus DX4 lists 1 active brush.
Filtration and debris
Dolphin Nautilus EON 120d includes Basket and UltraFilter; Dolphin Proteus DX4 includes Basket. That gives Dolphin Nautilus EON 120d the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin Nautilus EON 120d provides a weekly timer and smartphone control; Dolphin Proteus DX4 provides a weekly timer and power-supply controls. Dolphin Nautilus EON 120d uses cordless battery power, while Dolphin Proteus DX4 uses a 60 ft corded cable with an anti-tangle swivel.
Price, warranty and the decision
Both are listed at $1,199. Dolphin Nautilus EON 120d lists a 1-year warranty compared with 2 years for Dolphin Proteus DX4. Dolphin Nautilus EON 120d and Dolphin Proteus DX4 each have a specific fit, but neither is the Pool Express pick for this job. Our better alternative is Dolphin Quantum. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
Feature check: what each robot actually has
A green check means the feature is documented as included. A red X means it is documented as absent. A dash means the source does not make the feature clear.
| Feature | Dolphin Nautilus EON 120d | Dolphin Proteus DX4 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | Yes | Yes |
| Fine-debris filter included | YesEdge | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | Yes | Yes |
| Smartphone app | YesEdge | No |
| Anti-tangle swivel | Not listed | Yes |
| 3-year warranty | No | No |
| No recharging between cycles | No | YesEdge |
| Built-in UV-C water treatment | No | No |
Unknown is not treated as “no.” Specifications come from the product pages, current catalog records and manufacturer material collected for this site.
Where Dolphin Nautilus EON 120d stands out
Dolphin Nautilus EON 120d is the better fit for owners who value cordless handling more than automatic scheduling and continuous power.
- Includes filtration for sand, pollen and other fine debris
- Uses 2 active brushes instead of 1
- Adds smartphone control
Where Dolphin Proteus DX4 stands out
Dolphin Proteus DX4 is the better fit for inground pools that need floor, wall and waterline cleaning.
- Carries a 2-year warranty instead of 1 years
- Runs from continuous plug-in power without a recharge between cycles
Dolphin Nautilus EON 120d vs Dolphin Proteus DX4 specifications
Use pool fit first. Price and app control do not make up for a robot that cannot cover the length or surfaces you need cleaned.
| Specification | Dolphin Nautilus EON 120d | Dolphin Proteus DX4 |
|---|---|---|
| Best fit | Inground and above-ground pools up to 50 ft that need whole-pool cordless cleaning with the least filter maintenance. | Inground pools that need floor, wall and waterline cleaning. |
| Starting price | $1,199 | $1,199 |
| Pool type | Inground, Above-ground | Inground |
| Maximum pool length | Up to 50 ft | Not listed |
| Cleaning coverage | Floor, Walls, Waterline | Floor, Walls, Waterline |
| Power | Cordless | Corded |
| Filtration | Basket, UltraFilter | Basket |
| Scheduling | Weekly schedule + app | Weekly schedule |
| App and remote | App control | Power-supply controls |
| Cable | Cordless | 60 ft with anti-tangle swivel |
| Robot weight | 24.3 lb | Not listed |
| Warranty | 1 years | 2 years |
Consider the stronger Pool Express option
Dolphin Nautilus EON 120d and Dolphin Proteus DX4 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Quantum. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
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