Stock unclearRobotic pool cleaners

Dolphin

S400

A robotic pool cleaner offering connected premium s-line cleaner and floor, wall and waterline coverage.

Connected premium S-line cleanerFloor, wall and waterline coverage

Best for: Pools that need connected premium s-line cleaner and floor, wall and waterline coverage
Main limitation: Buyers who need a robot that is available to buy immediately

Local priceDetecting…View at Dolphin Compare

Overview

Dolphin S400 explained.

This pool cleaner is built to collect debris while moving independently through the pool. Coverage, filtration, runtime and retrieval determine how useful it is in everyday ownership.

The listed specification covers maximum pool length: 50 ft; cleaning coverage: Floor, Walls and Waterline; default cycle time: 2 Hours; cycle options: 1.5, 2, 2.5; filter type: Multi-Layer. These are the figures to compare with nearby models in the range.

Connected premium S-line cleanerFloor, wall and waterline coverage

How well we know this robot

What the evidence shows.

We publish three separate signals rather than one overall score, so you can see which kind of evidence is missing. Last researched 19 September 2026.

Confirmed dataGood

11 specifications checked against a named source. Most of the important figures for this model are confirmed against a named source.

Expert coverageNot reviewed

No credible outlet has published a review of this exact model. That is common for new or niche robots and is not a mark against it.

Prices checkedNone confirmed

We have not confirmed a live price for this model. Use the official product page below.

Confirmed data counts only figures we read on a named page. Where two sources disagreed, we left the figure out rather than pick one. How we rate robots

Where to buy

Prices and availability.

Listings match your selected market. Final price and stock are confirmed by the merchant.

Detecting your market and matching local buying routes…

Paid links are labelled. Commission does not affect the order or content of this page.

Owner reviews

Use this robot at home?

Share its performance, maintenance, faults and support experience.

Write an owner review

Alternatives

Other robotic pool cleaners to compare.

See all models

Checking availability

Mammotion · Robotic pool cleaners

SPINO E1

A long-running cordless pool cleaner designed to cover the floor, walls and waterline.

Best forPools up to 150m² and buyers who prioritise runtime

Local priceDetecting…

Compare View profile

New

Checking availability

Beatbot · Robotic pool cleaners

Sora 30

A 2026 cordless pool robot offering long runtime and broad surface coverage, but no official UK storefront yet.

Best forLarge European pools and long cleaning sessions

Local priceDetecting…

Compare View profile

Checking availability

Beatbot · Robotic pool cleaners

AquaSense X

A flagship pool robot whose dock cleans its filter and stores debris after the robot covers the surface, floor, walls and waterline.

Best forPremium pools where reducing filter and debris-bin maintenance is the priority

Local priceDetecting…

Compare View profile

Quick answers

About the S400.

Is the Dolphin S400 available now?

Its current product status is Stock unclear. Local stock can change, so use the prices section for the available sources in your selected market.

Who is it best for?

Pools that need connected premium s-line cleaner and floor, wall and waterline coverage. Its most notable capabilities are connected premium s-line cleaner, floor, wall and waterline coverage.

What is the main compromise?

Buyers who need a robot that is available to buy immediately.