Help me choose
A stronger Pool Express option
Dolphin Liberty 300 and Dolphin Premium 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.
Liberty
Dolphin Liberty 300
Inground and above-ground pools that need floor and wall cleaning, with fine debris, without a power cord.
Premium
Dolphin Premium 20
Inground and above-ground pools up to 33 ft that need floor and wall cleaning.
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 Liberty 300 or Dolphin Premium 20: our take
Dolphin Liberty 300 and Dolphin Premium 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
Both robots are intended for inground and above-ground pools. Dolphin Premium 20 has a published maximum pool length of 33 ft; the other model does not have a verified length in our source material. Each cleans floor and walls, so coverage alone does not separate them. Dolphin Liberty 300 lists Dual DC motors. Dolphin Premium 20 lists 1 active brush and CleverClean navigation.
Filtration and debris
Dolphin Liberty 300 includes Basket and UltraFilter; Dolphin Premium 20 includes Basket. That gives Dolphin Liberty 300 the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin Liberty 300 provides no fully published timer, app or remote specification; Dolphin Premium 20 provides one-touch starts and power-supply controls. Dolphin Liberty 300 uses cordless battery power, while Dolphin Premium 20 uses continuous corded power.
Price, warranty and the decision
Dolphin Liberty 300 is listed at $1,099 and Dolphin Premium 20 at $899; Dolphin Premium 20 is $200 less. Each lists a 2-year manufacturer warranty. Dolphin Liberty 300 and Dolphin Premium 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 Liberty 300 | Dolphin Premium 20 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | No | No |
| Fine-debris filter included | YesEdge | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | Not listed | No |
| Smartphone app | Not listed | No |
| Anti-tangle swivel | Not listed | No |
| 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 Liberty 300 stands out
Dolphin Liberty 300 is the better fit for owners who value cordless handling more than automatic scheduling and continuous power.
- Includes filtration for sand, pollen and other fine debris
- Cordless, battery powered
Where Dolphin Premium 20 stands out
Dolphin Premium 20 is the better fit for shoppers prioritizing the lower $899 starting price.
- Runs from continuous plug-in power without a recharge between cycles
- Is listed $200 lower
Dolphin Liberty 300 vs Dolphin Premium 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 Liberty 300 | Dolphin Premium 20 |
|---|---|---|
| Best fit | Inground and above-ground pools that need floor and wall cleaning, with fine debris, without a power cord. | Inground and above-ground pools up to 33 ft that need floor and wall cleaning. |
| Starting price | $1,099 | $899 |
| Pool type | Inground, Above-ground | Inground, Above-ground |
| Maximum pool length | Not listed | Up to 33 ft |
| Cleaning coverage | Floor, Walls | Floor, Walls |
| Power | Cordless | Corded |
| Filtration | Basket, UltraFilter | Basket |
| Scheduling | Not listed | One-touch start |
| App and remote | Not listed | Power-supply controls |
| Cable | Cordless | Not listed |
| Robot weight | Not listed | 14.6 lb |
| Warranty | 2 years | 2 years |
Consider the stronger Pool Express option
Dolphin Liberty 300 and Dolphin Premium 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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