Help me choose
A stronger Pool Express option
Dolphin Nautilus CC and Niya Sonar 20 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 CC
Inground and above-ground pools up to 33 ft that need floor and wall cleaning.
Niya Sonar
Niya Sonar 20
Above-ground pools up to 26 ft that need the floor cleaned without a cord.
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 CC or Niya Sonar 20: our take
Dolphin Nautilus CC and Niya Sonar 20 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 CC is intended for inground and above-ground pools, while Niya Sonar 20 is intended for above-ground pools. Dolphin Nautilus CC is rated for pools up to 33 ft; Niya Sonar 20 is rated up to 26 ft. Dolphin Nautilus CC cleans floor and walls; Niya Sonar 20 cleans floor. Dolphin Nautilus CC lists 1 active brush. Niya Sonar 20 lists Sonar navigation and Dual drive motors.
Filtration and debris
Both models include Basket.
Controls and day-to-day ownership
Both models provide one-touch starts and power-supply controls. Dolphin Nautilus CC uses a 50 ft corded cable, while Niya Sonar 20 uses cordless battery power.
Price, warranty and the decision
Dolphin Nautilus CC is listed at $699 and Niya Sonar 20 at $199; Niya Sonar 20 is $500 less. Dolphin Nautilus CC lists a 2-year warranty compared with 1 years for Niya Sonar 20. Dolphin Nautilus CC and Niya Sonar 20 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 CC | Niya Sonar 20 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | YesEdge | No |
| Scrubs the waterline | No | No |
| Fine-debris filter included | No | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | No | No |
| Smartphone app | No | No |
| Anti-tangle swivel | No | Not listed |
| 3-year warranty | No | No |
| No recharging between cycles | YesEdge | 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 CC stands out
Dolphin Nautilus CC is the better fit for pools up to 33 ft.
- Adds wall climbing and scrubbing
- Carries a 2-year warranty instead of 1 years
- Is rated for pools up to 33 ft
- Runs from continuous plug-in power without a recharge between cycles
Where Niya Sonar 20 stands out
Niya Sonar 20 is the better fit for shoppers prioritizing the lower $199 starting price.
- Is listed $500 lower
- Cleans the pool floor
Dolphin Nautilus CC vs Niya Sonar 20 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 CC | Niya Sonar 20 |
|---|---|---|
| Best fit | Inground and above-ground pools up to 33 ft that need floor and wall cleaning. | Above-ground pools up to 26 ft that need the floor cleaned without a cord. |
| Starting price | $699 | $199 |
| Pool type | Inground, Above-ground | Above-ground |
| Maximum pool length | Up to 33 ft | Up to 26 ft |
| Cleaning coverage | Floor, Walls | Floor |
| Power | Corded | Cordless |
| Filtration | Basket | Basket |
| Scheduling | One-touch start | One-touch start |
| App and remote | Power-supply controls | Power-supply controls |
| Cable | 50 ft | Cordless |
| Robot weight | Not listed | 10 lb |
| Warranty | 2 years | 1 years |
Consider the stronger Pool Express option
Dolphin Nautilus CC and Niya Sonar 20 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.
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