Help me choose
A stronger Pool Express option
Dolphin Liberty 400 and Dolphin S2000 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.
Liberty
Dolphin Liberty 400
Inground and above-ground pools up to 33 ft that need floor, wall and waterline cleaning without a cord.
S-Line
Dolphin S2000
Inground and above-ground pools up to 40 ft with steps or a sun ledge that need full-coverage cleaning on a schedule.
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 Liberty 400 or Dolphin S2000: our take
Dolphin Liberty 400 and Dolphin S2000 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 Liberty 400 is rated for pools up to 33 ft; Dolphin S2000 is rated up to 40 ft. Each cleans floor, walls, and waterline, so coverage alone does not separate them. Dolphin S2000's documented cleaning system includes 2 active brushes and CleverClean navigation.
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
Both models provide a weekly timer and smartphone control. Dolphin Liberty 400 uses cordless battery power, while Dolphin S2000 uses continuous corded power. Both are listed at 17.9 lb, so lifting effort is effectively the same.
Price, warranty and the decision
Dolphin Liberty 400 is listed at $1,429 and Dolphin S2000 at $1,199; Dolphin S2000 is $230 less. Dolphin Liberty 400 lists a 3-year warranty compared with 2 years for Dolphin S2000. Dolphin Liberty 400 and Dolphin S2000 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 Liberty 400 | Dolphin S2000 |
|---|---|---|
| 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 | Yes | Yes |
| Anti-tangle swivel | Not listed | Yes |
| 3-year warranty | YesEdge | 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 Liberty 400 stands out
Dolphin Liberty 400 is the better fit for owners who value cordless handling more than automatic scheduling and continuous power.
- Carries a 3-year warranty instead of 2 years
- Cleans floor, walls and waterline
Where Dolphin S2000 stands out
Dolphin S2000 is the better fit for shoppers prioritizing the lower $1,199 starting price.
- Is rated for pools up to 40 ft
- Runs from continuous plug-in power without a recharge between cycles
- Is listed $230 lower
Dolphin Liberty 400 vs Dolphin S2000 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 Liberty 400 | Dolphin S2000 |
|---|---|---|
| Best fit | Inground and above-ground pools up to 33 ft that need floor, wall and waterline cleaning without a cord. | Inground and above-ground pools up to 40 ft with steps or a sun ledge that need full-coverage cleaning on a schedule. |
| Starting price | $1,429 | $1,199 |
| Pool type | Inground, Above-ground | Inground, Above-ground |
| Maximum pool length | Up to 33 ft | Up to 40 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor, Walls, Waterline |
| Power | Cordless | Corded |
| Filtration | Basket, UltraFilter | Basket, UltraFilter |
| Scheduling | Weekly schedule + app | Weekly schedule + app |
| App and remote | App control | App control |
| Cable | Cordless | Not listed |
| Robot weight | 17.9 lb | 17.9 lb |
| Warranty | 3 years | 2 years |
Consider the stronger Pool Express option
Dolphin Liberty 400 and Dolphin S2000 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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