Help me choose
A stronger Pool Express option
Dolphin Explorer E20 and Dolphin Liberty 400 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.
Explorer
Dolphin Explorer E20
Inground and above-ground pools up to 33 ft that need floor and wall cleaning.
Liberty
Dolphin Liberty 400
Inground and above-ground pools up to 33 ft that need floor, wall and waterline cleaning without a cord.
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 Explorer E20 or Dolphin Liberty 400: our take
Dolphin Explorer E20 and Dolphin Liberty 400 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 33 ft. Dolphin Explorer E20 cleans floor and walls; Dolphin Liberty 400 cleans floor, walls, and waterline. Dolphin Explorer E20's documented cleaning system includes 1 active brush and Dual DC motors.
Filtration and debris
Dolphin Explorer E20 includes Basket; Dolphin Liberty 400 includes Basket and UltraFilter. Dolphin Liberty 400 has the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin Explorer E20 provides one-touch starts and power-supply controls; Dolphin Liberty 400 provides a weekly timer and smartphone control. Dolphin Explorer E20 uses a 40 ft corded cable, while Dolphin Liberty 400 uses cordless battery power. Dolphin Explorer E20 is listed at 14.5 lb versus 17.9 lb for Dolphin Liberty 400; that 3.3999999999999986 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin Explorer E20 is listed at $699 and Dolphin Liberty 400 at $1,429; Dolphin Explorer E20 is $730 less. Dolphin Explorer E20 lists a 2-year warranty compared with 3 years for Dolphin Liberty 400. Dolphin Explorer E20 and Dolphin Liberty 400 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 Explorer E20 | Dolphin Liberty 400 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | No | YesEdge |
| Fine-debris filter included | No | YesEdge |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | No | YesEdge |
| Smartphone app | No | YesEdge |
| Anti-tangle swivel | Not listed | Not listed |
| 3-year warranty | No | YesEdge |
| 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 Explorer E20 stands out
Dolphin Explorer E20 is the better fit for shoppers prioritizing the lower $699 starting price.
- Runs from continuous plug-in power without a recharge between cycles
- Is listed $730 lower
- Weighs 14.5 lb versus 17.9 lb
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.
- Cleans the floor, walls and waterline instead of stopping below the tile line
- Includes filtration for sand, pollen and other fine debris
- Can start on a weekly schedule without a manual launch before every cycle
- Adds smartphone control
Dolphin Explorer E20 vs Dolphin Liberty 400 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 Explorer E20 | Dolphin Liberty 400 |
|---|---|---|
| Best fit | Inground and above-ground pools up to 33 ft that need floor and wall cleaning. | Inground and above-ground pools up to 33 ft that need floor, wall and waterline cleaning without a cord. |
| Starting price | $699 | $1,429 |
| Pool type | Inground, Above-ground | Inground, Above-ground |
| Maximum pool length | Up to 33 ft | Up to 33 ft |
| Cleaning coverage | Floor, Walls | Floor, Walls, Waterline |
| Power | Corded | Cordless |
| Filtration | Basket | Basket, UltraFilter |
| Scheduling | One-touch start | Weekly schedule + app |
| App and remote | Power-supply controls | App control |
| Cable | 40 ft | Cordless |
| Robot weight | 14.5 lb | 17.9 lb |
| Warranty | 2 years | 3 years |
Consider the stronger Pool Express option
Dolphin Explorer E20 and Dolphin Liberty 400 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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