Robotic pool cleaner comparison

Blue Helix One vs Dolphin Nautilus EON 100

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

Blue Helix One and Dolphin Nautilus EON 100 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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Blue Helix

Blue Helix One

Inground pools that need floor, wall and waterline cleaning.

Listed price $579

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EON

Dolphin Nautilus EON 100

Inground and above-ground pools up to 50 ft with steps, benches or tanning ledges that need whole-pool cordless cleaning.

Listed price $899

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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

Blue Helix One or Dolphin Nautilus EON 100: our take

Blue Helix One and Dolphin Nautilus EON 100 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

Blue Helix One is intended for inground pools, while Dolphin Nautilus EON 100 is intended for inground and above-ground pools. Dolphin Nautilus EON 100 has a published maximum pool length of 50 ft; the other model does not have a verified length in our source material. Each cleans floor, walls, and waterline, so coverage alone does not separate them. Dolphin Nautilus EON 100's documented cleaning system includes 2 active brushes and SmartMap navigation.

Filtration and debris

Both models include Basket.

Controls and day-to-day ownership

Both models provide a weekly timer and smartphone control. Blue Helix One uses continuous corded power, while Dolphin Nautilus EON 100 uses cordless battery power.

Price, warranty and the decision

Blue Helix One is listed at $579 and Dolphin Nautilus EON 100 at $899; Blue Helix One is $320 less. Blue Helix One lists a 2-year warranty compared with 1 years for Dolphin Nautilus EON 100. Blue Helix One and Dolphin Nautilus EON 100 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	Blue Helix One	Dolphin Nautilus EON 100
Cleans the pool floor	Yes	Yes
Climbs and cleans walls	Yes	Yes
Scrubs the waterline	Yes	Yes
Fine-debris filter included	No	No
Large-debris filter	Yes	Yes
Automatic scheduling	Yes	Yes
Smartphone app	Yes	Yes
Anti-tangle swivel	Not listed	Not listed
3-year warranty	No	No
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 Blue Helix One stands out

Blue Helix One is the better fit for shoppers prioritizing the lower $579 starting price.

Carries a 2-year warranty instead of 1 years
Runs from continuous plug-in power without a recharge between cycles
Is listed $320 lower

Where Dolphin Nautilus EON 100 stands out

Dolphin Nautilus EON 100 is the better fit for owners who value cordless handling more than automatic scheduling and continuous power.

Cleans floor, walls, waterline, steps and 8 in ledges
Cordless, up to a week of cleaning per charge