Corded waterline~$1,499Dolphin
Sold mostly through pool dealers, the S300 is also on Maytronics' own store, and it is one of the few Dolphins whose spec block lists a caddy in the box. Two filter kits, app scheduling, waterline scrubbing and a two-year warranty round it out.
Approx. price
~$1,499
snapshot, not a live price
the maker lists no self-parking, so it comes out from wherever the cycle ended, full of water
120 min cycle
Best for: Buyers who want the caddy and both filter kits in one box
A specification not listed here is one Dolphin does not publish for this model. It is left blank rather than estimated or borrowed from a sibling.
The two lists above come from the maker’s own specifications and this site’s arithmetic on them, not from owner reports. Where owner discussion has been read it appears in its own section below, so the two are never mistaken for each other.
Sold mostly through pool dealers, with a caddy and two filter kits in the box, the S300 draws mixed owner reports: one has not had to vacuum or scrub once all season and another was pretty happy two weeks in (2024), while others met coverage gaps and start-up faults.
Coverage surprised a first-time owner whose first deep clean missed sections (2024). In a pool with a steep diving end, one unit slid toward the deep end when turning, stuck on the main drain and scrubbed only about 5 feet of waterline at a time (2023). Two units moved a few seconds and stopped, and a new one needed a warranty claim within a month (2025).
It suits an owner who expects coverage without mapping and has no steep diving slope; for a pool with one, a dealer said they usually sell nothing smaller than an M400 (2023). One service technician says its app shows errors in plain English along with run history, which makes faults easy to diagnose.
Not by one owner's account: surprised when it missed sections on its first deep clean, that owner learned most robots do not map the pool (2024). Another owner was told it follows a preset grid whatever the pool's shape and may need several cycles to clean well.
Two owners report this on the same machine in 2025, one with a button light turning from blue to red. One suspected the motor, possibly the cord, and bought a new robot; a suggested check is testing the cord with a multimeter for continuity or about 20 volts at the robot. Another new unit needed a warranty claim in its first month and did much the same for two weeks, and its owner says it now works about 90% of the time without knowing why.
Both, by its listing, which rates it to 50 feet. When someone said it was for above-ground pools, one owner answered that theirs runs in an in-ground pool (2023).
Corded waterline · 120 min cycle
Cleans: Floor, walls, waterline
Corded waterline · 120 min cycle
Cleans: Floor, walls, waterline
Corded waterline · 150 min cycle
Cleans: Floor, walls, waterline