Help me choose
A stronger Pool Express option
Dolphin Nautilus EON 120d and Dolphin S200 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.
S-Line
Dolphin S200
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
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 S200: our take
Dolphin Nautilus EON 120d and Dolphin S200 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 S200 is intended for inground pools. Both are rated for pools up to 50 ft. 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 S200 lists 2 active brushes.
Filtration and debris
Both models include Basket and UltraFilter. Both have documented fine-debris media, so basket capacity and ease of cleaning matter more than fine-particle capability.
Controls and day-to-day ownership
Dolphin Nautilus EON 120d provides a weekly timer and smartphone control; Dolphin S200 provides a weekly timer and power-supply controls. Dolphin Nautilus EON 120d uses cordless battery power, while Dolphin S200 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 S200. Dolphin Nautilus EON 120d and Dolphin S200 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 S200 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | Yes | Yes |
| Fine-debris filter included | Yes | Yes |
| 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.
- Adds smartphone control
- Cleans floor, walls, waterline, steps and 8 in ledges
Where Dolphin S200 stands out
Dolphin S200 is the better fit for inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
- 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 S200 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 S200 |
|---|---|---|
| Best fit | Inground and above-ground pools up to 50 ft that need whole-pool cordless cleaning with the least filter maintenance. | Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris. |
| Starting price | $1,199 | $1,199 |
| Pool type | Inground, Above-ground | Inground |
| Maximum pool length | Up to 50 ft | Up to 50 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor, Walls, Waterline |
| Power | Cordless | Corded |
| Filtration | Basket, UltraFilter | Basket, UltraFilter |
| 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 S200 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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