Help me choose
A stronger Pool Express option
Dolphin Nautilus EON 100 and Dolphin Nautilus EON 120d 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 100
Inground and above-ground pools up to 50 ft with steps, benches or tanning ledges that need whole-pool cordless cleaning.
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.
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 100 or Dolphin Nautilus EON 120d: our take
Dolphin Nautilus EON 100 and Dolphin Nautilus EON 120d 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
Both robots are intended for inground and above-ground 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 100's documented cleaning system includes 2 active brushes and SmartMap navigation.
Filtration and debris
Dolphin Nautilus EON 100 includes Basket; Dolphin Nautilus EON 120d includes Basket and UltraFilter. Dolphin Nautilus EON 120d has the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Both models provide a weekly timer and smartphone control. Both use cordless battery power. Dolphin Nautilus EON 100 is listed at 22.1 lb versus 24.3 lb for Dolphin Nautilus EON 120d; that 2.1999999999999993 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin Nautilus EON 100 is listed at $899 and Dolphin Nautilus EON 120d at $1,199; Dolphin Nautilus EON 100 is $300 less. Each lists a 1-year manufacturer warranty. Dolphin Nautilus EON 100 and Dolphin Nautilus EON 120d 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 100 | Dolphin Nautilus EON 120d |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | Yes | Yes |
| Fine-debris filter included | No | YesEdge |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | Yes | Yes |
| Smartphone app | Yes | Yes |
| Anti-tangle swivel | Not listed | Not listed |
| 3-year warranty | No | No |
| No recharging between cycles | No | No |
| 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 100 stands out
Dolphin Nautilus EON 100 is the better fit for shoppers prioritizing the lower $899 starting price.
- Is listed $300 lower
- Weighs 22.1 lb versus 24.3 lb
Where Dolphin Nautilus EON 120d stands out
Dolphin Nautilus EON 120d is the better fit for inground and above-ground pools up to 50 ft that need whole-pool cordless cleaning with the least filter maintenance.
- Includes filtration for sand, pollen and other fine debris
- DebrisLock self-backwashing 14-micron filter
Dolphin Nautilus EON 100 vs Dolphin Nautilus EON 120d 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 100 | Dolphin Nautilus EON 120d |
|---|---|---|
| Best fit | Inground and above-ground pools up to 50 ft with steps, benches or tanning ledges that need whole-pool cordless cleaning. | Inground and above-ground pools up to 50 ft that need whole-pool cordless cleaning with the least filter maintenance. |
| Starting price | $899 | $1,199 |
| Pool type | Inground, Above-ground | Inground, Above-ground |
| Maximum pool length | Up to 50 ft | Up to 50 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor, Walls, Waterline |
| Power | Cordless | Cordless |
| Filtration | Basket | Basket, UltraFilter |
| Scheduling | Weekly schedule + app | Weekly schedule + app |
| App and remote | App control | App control |
| Cable | Cordless | Cordless |
| Robot weight | 22.1 lb | 24.3 lb |
| Warranty | 1 years | 1 years |
Consider the stronger Pool Express option
Dolphin Nautilus EON 100 and Dolphin Nautilus EON 120d 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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