Dolphin S400 review

This is a source-based assessment of the U.S. Dolphin S400, Product No. 99996261-US, not a hands-on test. Maytronics lists floor, wall and waterline cleaning for pools up to 50 ft, together with Wi-Fi and the MyDolphin Plus app. The same exact page names a multi-layer filtration basket, a caddy, selectable cycle durations, a weekly timer and a delay feature. It does not establish the cleaner's cable length, installation limits or an included Ultra-Fine Filter Kit.

Broad coverage, with a number that is easy to misread

The exact U.S. product table identifies Product No. 99996261-US and lists floor, walls and waterline as cleaning coverage. It also lists both in-ground and above-ground pool classifications and rectangular, round, free-shape and kidney shapes. That is a useful starting screen if those are the areas you need; it is not evidence that every slope, step, corner, ledge, finish or waterline geometry will be handled in the same way. The current product page does not supply a qualified step-depth claim.

Maytronics gives a 50 ft maximum pool length. That is not the length of the power cable and should not be used to infer where the power supply can safely sit. The S400 image shows a cable attached to the S400-marked body, supporting a corded classification, but neither that image nor the page gives a cable-length measurement or a safe outlet-to-water layout. The product page links to a manual lookup using the exact U.S. number; the lookup returns “No products were found matching your selection.” I therefore cannot verify S400-specific water depth, electrical placement, pool-finish limits, step rules or care directions from a model-matched manual. Check current manufacturer instructions before relying on the rating in an unusual pool or installation.

Cycle options and connected features

The listing gives a two-hour default cycle and available durations of 1.5, 2 and 2.5 hours. It also lists a weekly timer and a delay feature. Those fields describe the published control options, not independent measurements of cleaning time or proof that a shorter cycle reaches every listed surface. For a recurring routine, verify the exact settings and program behavior in current S400-specific instructions rather than treating “automation” as a complete description.

The exact table names Wi-Fi connectivity and MyDolphin Plus, so an app-capable connection is part of the documented package. The same table says “Remote Control: No.” The page does not enumerate the S400's app functions, so the app name alone does not support a claim of live steering, a particular status screen or remote mode. Its separate “Automation Mode: Yes” value is not defined on the product page and should not be used to fill in those missing details.

Read the filter line as written

Maytronics calls the S400 filter type “Multi-Layer” and describes an extra-large filtration basket. It lists top access and a full-filter indicator, useful details to consider when comparing the emptying routine. But the exact U.S. page does not identify a separate included Ultra-Fine Filter Kit or state a particle-size grade. A filter product displayed in the Add-On Accessories area is not evidence of an extra item in the box, and a parts route queried with the European S400 number does not establish fit or package contents for 99996261-US.

This is a material difference from some nearby S-series listings, so do not borrow their filter fields. The U.S. S200 page explicitly names an additional Ultra-Fine Filter Kit in the box while saying its mobile application is “No.” The U.S. S300 page also separately lists an additional Ultra-Fine Filter Kit and names MyDolphin Plus, but says “Delay Feature: No.” The S400 instead lists a delay feature, but its filter line is only “Multi-Layer” and does not establish an included Ultra-Fine kit. These are distinct product numbers and package claims, not a basis for assuming shared components or cartons. Read the separate S200 and S300 assessments if those differences matter.

Handling and seller checks

The exact table states that a caddy is included and lists robot weight as 18.5 lb. It also gives body dimensions of 17.433 × 15.839 × 11.717 inches and package dimensions of 23.7 × 19.4 × 19.6 inches. These are manufacturer catalog values, not measurements made for this assessment. They can help with a storage or delivery plan, but the unavailable exact-number manual leaves lifting, draining, retrieval and storage directions unresolved. Confirm the seller's actual carton includes the caddy if that package detail matters.

The page lists two standard brushes, an active-brush field, a claimed 4,000 gallons-per-hour suction rate and a two-year warranty. The suction figure is a manufacturer specification, not a test result, and the warranty field is not a substitute for checking terms on the exact U.S. offer. The manufacturer page currently has its own availability information, which can change; this review does not claim current stock or a price. Ask the seller to identify the product number and confirm supplied equipment rather than relying on the S400 name alone.

Bottom line

The S400 is a plausible comparison when you want a corded cleaner listed for three surfaces, a 50 ft pool maximum, selectable cycle lengths, weekly scheduling, a delay option, app availability and a caddy. Its unresolved points are consequential: 50 ft is a pool rating, not cord reach; no matching U.S. manual was returned; the page does not establish depth, qualified step, finish or installation limits; and the multi-layer filter description does not prove an in-box Ultra-Fine kit. If an included filter kit is essential, the current S400 listing should not pass that requirement without exact package evidence. Confirm the full product number, seller carton, current manual and warranty terms for the offer you are considering. No independent test, ownership, price, stock status or customer experience is claimed here.

Sources: Maytronics' exact U.S. Dolphin S400 product page; its product-linked exact-number U.S. manual selector (no products found); and the manufacturer image linked from that page. Comparisons use Maytronics' separate U.S. S200 page and U.S. S300 page; their facts are not transferred to the S400.