Robotic pool cleaner comparison

Dolphin Echo vs Dolphin S100

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 Echo and Dolphin S100 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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Echo

Dolphin Echo

Inground and above-ground pools up to 33 ft that need floor and wall cleaning with the least fuss.

Listed price $749

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S-Line

Dolphin S100

Inground and above-ground pools up to 33 ft that need floor and wall cleaning, with fine debris.

Listed price $849

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A better alternative

What we recommend instead

Pool Express pick

Dolphin Cayman

Inground and above-ground pools up to 40 ft that need floor and wall cleaning.

$1,079

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Buying guidance

Dolphin Echo or Dolphin S100: our take

Dolphin Echo and Dolphin S100 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. Each cleans floor and walls, so coverage alone does not separate them. Dolphin Echo lists 1 active brush and CleverClean navigation. Dolphin S100 lists 1 active brush.

Filtration and debris

Dolphin Echo includes Basket; Dolphin S100 includes Basket and UltraFilter. Dolphin S100 has the clearer documented edge for fine silt, pollen and sand.

Controls and day-to-day ownership

Dolphin Echo provides one-touch starts and power-supply controls; Dolphin S100 provides a weekly timer and power-supply controls. Dolphin Echo uses continuous corded power, while Dolphin S100 uses a 50 ft corded cable. Dolphin Echo is listed at 14.8 lb versus 14 lb for Dolphin S100; that 0.8000000000000007 lb difference matters when lifting the robot from the pool.

Price, warranty and the decision

Dolphin Echo is listed at $749 and Dolphin S100 at $849; Dolphin Echo is $100 less. Each lists a 2-year manufacturer warranty. Dolphin Echo and Dolphin S100 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 Echo	Dolphin S100
Cleans the pool floor	Yes	Yes
Climbs and cleans walls	Yes	Yes
Scrubs the waterline	No	No
Fine-debris filter included	No	YesEdge
Large-debris filter	Yes	Yes
Automatic scheduling	No	YesEdge
Smartphone app	No	No
Anti-tangle swivel	No	Not listed
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 Echo stands out

Dolphin Echo is the better fit for shoppers prioritizing the lower $749 starting price.

Is listed $100 lower
2-hour cycle, 33 ft pools

Where Dolphin S100 stands out

Dolphin S100 is the better fit for inground and above-ground pools up to 33 ft that need floor and wall cleaning, with fine debris.

Includes filtration for sand, pollen and other fine debris
Can start on a weekly schedule without a manual launch before every cycle
Weighs 14 lb versus 14.8 lb