Help me choose
A stronger Pool Express option
Dolphin Nautilus EON 120d and Dolphin T25 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.
T-Line
Dolphin T25
Inground and above-ground pools up to 33 ft that need floor and wall 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 T25: our take
Dolphin Nautilus EON 120d and Dolphin T25 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. Dolphin Nautilus EON 120d is rated for pools up to 50 ft; Dolphin T25 is rated up to 33 ft. Dolphin Nautilus EON 120d cleans floor, walls, and waterline; Dolphin T25 cleans floor and walls. Dolphin Nautilus EON 120d lists 2 active brushes and SmartMap navigation. Dolphin T25 lists 1 active brush.
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 T25 provides a weekly timer and power-supply controls. Dolphin Nautilus EON 120d uses cordless battery power, while Dolphin T25 uses a 50 ft corded cable. Dolphin Nautilus EON 120d is listed at 24.3 lb versus 15 lb for Dolphin T25; that 9.3 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin Nautilus EON 120d is listed at $1,199 and Dolphin T25 at $849; Dolphin T25 is $350 less. Dolphin Nautilus EON 120d lists a 1-year warranty compared with 2 years for Dolphin T25. Dolphin Nautilus EON 120d and Dolphin T25 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 T25 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | YesEdge | No |
| Fine-debris filter included | Yes | Yes |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | Yes | Yes |
| Smartphone app | YesEdge | No |
| Anti-tangle swivel | Not listed | Not listed |
| 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.
- Cleans the floor, walls and waterline instead of stopping below the tile line
- Uses 2 active brushes instead of 1
- Adds smartphone control
- Is rated for pools up to 50 ft
Where Dolphin T25 stands out
Dolphin T25 is the better fit for shoppers prioritizing the lower $849 starting price.
- Carries a 2-year warranty instead of 1 years
- Runs from continuous plug-in power without a recharge between cycles
- Is listed $350 lower
- Weighs 15 lb versus 24.3 lb
Dolphin Nautilus EON 120d vs Dolphin T25 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 T25 |
|---|---|---|
| Best fit | Inground and above-ground pools up to 50 ft that need whole-pool cordless cleaning with the least filter maintenance. | Inground and above-ground pools up to 33 ft that need floor and wall cleaning, with fine debris. |
| Starting price | $1,199 | $849 |
| Pool type | Inground, Above-ground | Inground, Above-ground |
| Maximum pool length | Up to 50 ft | Up to 33 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor, Walls |
| Power | Cordless | Corded |
| Filtration | Basket, UltraFilter | Basket, UltraFilter |
| Scheduling | Weekly schedule + app | Weekly schedule |
| App and remote | App control | Power-supply controls |
| Cable | Cordless | 50 ft |
| Robot weight | 24.3 lb | 15 lb |
| Warranty | 1 years | 2 years |
Consider the stronger Pool Express option
Dolphin Nautilus EON 120d and Dolphin T25 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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