Help me choose
A stronger Pool Express option
Dolphin Nautilus AG and Dolphin T25 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Cayman. Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
Nautilus
Dolphin Nautilus AG
Above-ground and small inground pools up to 30 ft that need the floor vacuumed.
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 Cayman
Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
$1,079
Buy Dolphin CaymanDolphin Nautilus AG or Dolphin T25: our take
Dolphin Nautilus AG 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
Dolphin Nautilus AG is intended for above-ground pools, while Dolphin T25 is intended for inground and above-ground pools. Dolphin Nautilus AG is rated for pools up to 30 ft; Dolphin T25 is rated up to 33 ft. Dolphin Nautilus AG cleans floor; Dolphin T25 cleans floor and walls. Dolphin Nautilus AG lists 1 active brush and CleverClean navigation. Dolphin T25 lists 1 active brush.
Filtration and debris
Dolphin Nautilus AG includes Basket; Dolphin T25 includes Basket and UltraFilter. Dolphin T25 has the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin Nautilus AG provides one-touch starts and power-supply controls; Dolphin T25 provides a weekly timer and power-supply controls. Dolphin Nautilus AG uses continuous corded power, while Dolphin T25 uses a 50 ft corded cable. Dolphin Nautilus AG is listed at 14.6 lb versus 15 lb for Dolphin T25; that 0.40000000000000036 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin Nautilus AG is listed at $568 and Dolphin T25 at $849; Dolphin Nautilus AG is $281 less. Dolphin Nautilus AG lists a 1-year warranty compared with 2 years for Dolphin T25. Dolphin Nautilus AG and Dolphin T25 each have a specific fit, but neither is the Pool Express pick for this job. Our better alternative is Dolphin Cayman. Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
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 AG | Dolphin T25 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | No | YesEdge |
| Scrubs the waterline | No | No |
| Fine-debris filter included | No | YesEdge |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | No | YesEdge |
| Smartphone app | No | No |
| Anti-tangle swivel | No | Not listed |
| 3-year warranty | No | No |
| No recharging between cycles | Yes | Yes |
| 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 AG stands out
Dolphin Nautilus AG is the better fit for shoppers prioritizing the lower $568 starting price.
- Is listed $281 lower
- Weighs 14.6 lb versus 15 lb
Where Dolphin T25 stands out
Dolphin T25 is the better fit for pools up to 33 ft.
- Adds wall climbing and scrubbing
- Includes filtration for sand, pollen and other fine debris
- Can start on a weekly schedule without a manual launch before every cycle
- Carries a 2-year warranty instead of 1 years
Dolphin Nautilus AG 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 AG | Dolphin T25 |
|---|---|---|
| Best fit | Above-ground and small inground pools up to 30 ft that need the floor vacuumed. | Inground and above-ground pools up to 33 ft that need floor and wall cleaning, with fine debris. |
| Starting price | $568 | $849 |
| Pool type | Above-ground | Inground, Above-ground |
| Maximum pool length | Up to 30 ft | Up to 33 ft |
| Cleaning coverage | Floor | Floor, Walls |
| Power | Corded | Corded |
| Filtration | Basket | Basket, UltraFilter |
| Scheduling | One-touch start | Weekly schedule |
| App and remote | Power-supply controls | Power-supply controls |
| Cable | Not listed | 50 ft |
| Robot weight | 14.6 lb | 15 lb |
| Warranty | 1 years | 2 years |
Consider the stronger Pool Express option
Dolphin Nautilus AG and Dolphin T25 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Cayman. Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
More robotic pool cleaner comparisons
Keep comparing without rebuilding the same specification table yourself.
Clear UV vs Clear S
Pool Express pick: Clear UV
Dolphin Quantum vs Clear S
Pool Express pick: Dolphin Quantum
Dolphin Premier vs Dolphin Sigma
Pool Express pick: Dolphin Premier
Dolphin Premier vs Dolphin Quantum
Pool Express pick: Dolphin Quantum
Dolphin Sigma vs Dolphin Quantum
Pool Express pick: Dolphin Quantum
Dolphin Cayman vs Dolphin Escape
Pool Express pick: Dolphin Cayman