Dolphin NAUTILUS EON 100 review

The NAUTILUS EON 100 is Maytronics Product No. 99994401-PC, a cordless residential cleaner presented for pools up to 50 feet. Its appeal on paper is a mix of broad coverage claims, a weekly-use scheduler and app setup rather than a cable run back to a power supply. This is a source-based assessment of the exact U.S. listing and the instructions linked for that SKU—not a pool trial or a claim of ownership.

What the published fit actually supports

The product page names an in-ground and above-ground cleaner, gives rectangular, round, free-form and kidney pool shapes, and lists a 50-foot maximum length. The same page advertises steps and ledges as shallow as eight inches. The EON family manual adds useful operating detail: a Full Coverage mode for the floor, walls, waterline, steps and sun ledge, plus a Floor-Only mode. Those capabilities make the model a plausible candidate when cordless operation and shallow features matter, but the length figure is a manufacturer limit, not a guarantee that every pool geometry or debris pattern will be handled equally.

There is one important qualification: the exact -PC page lists Water Line in its coverage field, then says “Waterline Scrubbing No” in its Cleaning section. The shared manual, which the exact manual portal provides for this SKU, describes both Full Coverage and Waterline-Only modes for the EON 100/120d family. Since that family document does not settle the contradiction on this exact retail record, this assessment does not count waterline cleaning as established for 99994401-PC. If the waterline is a must-have, get the maker to confirm this product number in writing before relying on the feature.

Modes, scheduling and phone limits

Maytronics lists a two-hour default cycle and 1.5-, 2- and 2.5-hour cycle options. The manual describes UltraRun as multiple shorter cycles from one charge and says schedules are configured in Maytronics One. It also describes floor-only and full-coverage paths. These are different routines: a maintenance schedule should not be treated as one continuous full-pool cycle, and stopping the schedule with the Clicker may require restarting UltraRun before the robot goes back into the water.

The app is useful for configuration, schedule settings, battery status, cleaning history, troubleshooting and choosing a homing wall. The instructions say the phone connects to the robot when it is out of water; the app cannot communicate with or control the unit while it is submerged. The manual describes Bluetooth pairing followed by Wi-Fi for additional functions, and its troubleshooting section specifies a 2.4 GHz Wi-Fi network. That is a useful planning detail for a weak or combined-band router, but it is not a promise of underwater remote steering.

Filter and carton questions are not minor details

The exact page labels the filter a Fine Filter Kit and says access is from the top. Maytronics’ EON line comparison instead describes the EON 100 as using a 70-micron Monoblock basket. The common EON manual’s box illustration shows a DebrisLock or Monoblock basket, but it does not map that illustration to the 99994401-PC carton. Filter construction, replacement media and package contents therefore remain unresolved here; the site does not award an ultra-fine-kit match.

The same manual drawing depicts a Clicker, with the grab hook marked optional, while the EON line comparison says Clicker and pickup are not included for EON 100. That is another reason to verify the precise package with the seller rather than assume a recovery tool is in the box. The manual recommends rinsing the filter promptly after use and periodically cleaning filter panels when the fitted basket uses them. It also says a full charge can take up to 4.5 hours and that the built-in lithium-ion battery is not user-replaceable.

Limits and safety checks before shortlisting

The shared instructions give a pool-depth range of 8 inches to 10 feet, water temperature of 41–95°F, maximum chlorine of 4 ppm, pH of 7.0–7.8 and salt no higher than 5,000 ppm. They advise against operation after liquid flocculant or another clarifier has been added, require the original charger, and say to keep the charger at least 10 feet from the pool edge while operating. Remove the robot before anyone enters the pool. These conditions may matter more than a broad surface-coverage claim, particularly for unusual finishes, deep coves or an irregular shelf.

Maytronics lists a one-year warranty for this exact -PC item. The separate Dolphin EON 100 99994400-US listing has a different retail name and a two-year warranty; the common family manual alone does not erase that distinction. Before buying, match the suffix exactly, confirm the warranty that applies to the seller and serial number, and have the filter basket and recovery tools identified on the invoice. A targeted search of the CPSC all-recalls dataset found no product-specific entry for this model or its related EON 100 SKU as of October 28, 2026; that limited database check is not a safety certification or a promise about future notices.

Who should keep it on the list?

Keep 99994401-PC in consideration if a battery-powered machine, the stated pool-length range, app configuration between cycles, and support for steps or shallow ledges align with the pool. Do not treat its waterline capability, filter type or box contents as settled. The exact SKU matters: the NAUTILUS name, one-year page warranty, conflicting coverage field and ambiguous basket are meaningful shopping distinctions, even though Maytronics routes this product number to the same broad EON family manual as the -US EON 100.