Robotic pool cleaner comparison

Dolphin T2000 vs Dolphin T55i

A side-by-side comparison of pool fit, cleaning coverage, filtration, controls and the better Pool Express option.

By Brian Williamson, Pool Express product specialist
Updated November 9, 2026

Better alternative

A stronger Pool Express option

Dolphin T2000 and Dolphin T55i 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.

Buy Dolphin Quantum Compare every robot

T-Line

Dolphin T2000

Inground and above-ground pools up to 40 ft with steps or a sun ledge that need full-coverage cleaning on a schedule.

Listed price $1,199

View better alternatives

T-Line

Dolphin T55i

Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.

Listed price $1,699

View better alternatives

A better alternative

What we recommend instead

Pool Express pick

Dolphin Quantum

Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.

$1,649

Buy Dolphin Quantum

Buying guidance

Dolphin T2000 or Dolphin T55i: our take

Dolphin T2000 and Dolphin T55i 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 T2000 is intended for inground and above-ground pools, while Dolphin T55i is intended for inground pools. Dolphin T2000 is rated for pools up to 40 ft; Dolphin T55i is rated up to 50 ft. Each cleans floor, walls, and waterline, so coverage alone does not separate them. Dolphin T2000'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

Dolphin T2000 provides a weekly timer and smartphone control; Dolphin T55i provides a weekly timer, smartphone control, and included remote control. Dolphin T2000 uses continuous corded power, while Dolphin T55i uses a 60 ft corded cable with an anti-tangle swivel.

Price, warranty and the decision

Dolphin T2000 is listed at $1,199 and Dolphin T55i at $1,699; Dolphin T2000 is $500 less. Each lists a 2-year manufacturer warranty. Dolphin T2000 and Dolphin T55i 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 T2000	Dolphin T55i
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	Yes	Yes
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 T2000 stands out

Dolphin T2000 is the better fit for shoppers prioritizing the lower $1,199 starting price.

Is listed $500 lower
Cleans floor, walls, waterline, steps and sun ledges

Where Dolphin T55i stands out

Dolphin T55i is the better fit for pools up to 50 ft.

Is rated for pools up to 50 ft
Cleans floor, walls and waterline