Dolphin (Maytronics) Cayman vs Dolphin (Maytronics) Nautilus EON 120d
Researched by Riley Hart · prices checked Oct 26, 2026
As of Oct 26, 2026, the Dolphin (Maytronics) Cayman costs $1,129 and the Dolphin (Maytronics) Nautilus EON 120d costs $1,199, so the Dolphin (Maytronics) Cayman is $70 cheaper. Pick the Dolphin (Maytronics) Cayman for small pools on a budget. Pick the Dolphin (Maytronics) Nautilus EON 120d for fine dirt and sun ledges.
- Cleans
- Floor and walls
- Power
- Corded
- Runtime
- 2 h cycle
- Max pool
- 40 ft long
The cheapest way here to get a corded robot on a weekly timer, which means no daily charging or hauling. It is light and simple, but Maytronics does not list waterline scrubbing, there is no app, and it is rated for pools up to 40 ft. Skip it for large or very leafy pools.
Full Dolphin (Maytronics) Cayman review →- Cleans
- Floor
- Power
- Cordless
- Runtime
- 1.5 to 2.5 h cycles
- Max pool
- 50 ft long
A good fit for cordless buyers who care most about trapping fine dirt and want a robot that reaches 8 inch sun ledges. PCWorld found its filter caught debris very well but was a real chore to empty, and it sometimes missed corners and leaves on steps. Check the warranty, which is only 1 year on the Nautilus listing.
Full Dolphin (Maytronics) Nautilus EON 120d review →Side by side
| Dolphin (Maytronics) Cayman | Dolphin (Maytronics) Nautilus EON 120d | |
|---|---|---|
| Price | $1,129 | $1,199 |
| 3 year cost | $1,169 | $1,199 |
| Our score | Not scored yet | Not scored yet |
| Rank in Pool | #10 | #11 |
| Status | on sale | on sale |
| Warranty | 2 years | 1 year (Nautilus EON 120d listing) |
| Pool types | In-ground and above-ground; rectangular, round, free form, kidney | In-ground and above-ground; rectangular, round, free form, kidney |
| Cleans | Floor and walls; Maytronics lists no waterline scrubbing | Floor, walls, waterline, steps, sun ledges as shallow as 8 in, corners |
| Power | Corded | Cordless, lithium-ion (capacity not published) |
| Runtime | Default 2 h cycle; no battery | Cycles of 1.5, 2 or 2.5 h; Maytronics blog claims up to 4 h per charge; UltraRun short cycles claimed to last up to 2.5 weeks per charge |
| Charge time | None (corded) | n/a |
| Filter | Top load fine filter basket; ultra fine baskets and panels sold separately | DebrisLock ultra fine backwash filter, top access |
| Max pool size | Pools up to 40 ft long | Pools up to 50 ft long |
| App | None | Maytronics One app for scheduling, monitoring and alerts |
| Timer | Weekly timer | n/a |
| Weight | 14.619 lb | 24.255 lb |
| Warranty | 2 years | 1 year on the Nautilus listing (3 years on the store exclusive EON 120d listing) |
| Best for | small pools on a budget | fine dirt and sun ledges |
| Skip if | your pool is longer than 40 ft | you hate fiddly filter cleaning |
Specs are maker claims unless a reviewer is named. Prices from the stores we link, checked daily.
What reviewers found
Dolphin (Maytronics) Cayman
- The Pool Nerd: Rated it best value; praised the weekly timer, corded consistency and top load MaxBin, noted it lacks an anti tangle swivel. Affiliate site with links to Dolphin dealers. Source
Dolphin (Maytronics) Nautilus EON 120d
- PCWorld: Tested the EON 120d: DebrisLock filter trapped all types of debris and coverage reached about 95% on the longest cycle, but emptying the filter was a huge pain, it missed corners, failed to start twice at first, and often flipped onto its back. Source
- The Pool Nerd: Notes the EON line cleans water as shallow as about 8 in with better than basic mesh filtering, but still requires hooking, lifting, drying and charging; Clicker retrieval is mentioned for the 120d. Source
Pros and cons
Dolphin (Maytronics) Cayman
Pros
- Weekly timer automation
- Light at about 14.6 lb
- Top load basket is easy to empty
- Works in above-ground pools too
Cons
- No waterline scrubbing listed by Maytronics
- No app
- 2 year warranty, shorter than pricier Dolphins
- Fine filter upgrades cost extra
Dolphin (Maytronics) Nautilus EON 120d
Pros
- Very effective fine debris filter per PCWorld
- Cleans ledges as shallow as 8 in
- App scheduling with UltraRun short cycles
- Handled stairs well in testing
Cons
- Filter is hard to empty per PCWorld
- Missed corners and some step leaves
- Battery size and charge time not published
- 1 year warranty on the Nautilus version
Questions buyers ask
Which is better, the Dolphin (Maytronics) Cayman or the Dolphin (Maytronics) Nautilus EON 120d?
Pick the Dolphin (Maytronics) Cayman for small pools on a budget. Pick the Dolphin (Maytronics) Nautilus EON 120d for fine dirt and sun ledges.
Which is cheaper?
The Dolphin (Maytronics) Cayman at $1,129, versus $1,199 for the Dolphin (Maytronics) Nautilus EON 120d, checked Oct 26, 2026. Over 3 years with running costs: $1,169 vs $1,199.
What is the difference between the Cayman and the Nautilus EON 120d?
Cleans: Floor and walls; Maytronics lists no waterline scrubbing on the Cayman, Floor, walls, waterline, steps, sun ledges as shallow as 8 in, corners on the Nautilus EON 120d. Power: Corded on the Cayman, Cordless, lithium-ion (capacity not published) on the Nautilus EON 120d. Runtime: Default 2 h cycle; no battery on the Cayman, Cycles of 1.5, 2 or 2.5 h; Maytronics blog claims up to 4 h per charge; UltraRun short… on the Nautilus EON 120d.
Also consider
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All robotic pool cleaners, ranked
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