# Dolphin (Maytronics) Cayman vs Dolphin (Maytronics) Nautilus EON 120d

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.

Prices checked Oct 26, 2026. HTML version: https://robotsforthat.com/vs/dolphin-cayman-vs-dolphin-nautilus-eon-120d/

## 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 |

## 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](https://www.thepoolnerd.com/dolphin-cayman-review)

### 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](https://pcworld.com/article/3084901/maytronics-dolphin-eon-120d-review.html)
- 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](https://www.thepoolnerd.com/best-cordless-robotic-pool-cleaners)

## 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.

Full reviews: [Dolphin (Maytronics) Cayman](https://robotsforthat.com/robot/dolphin-cayman/index.md), [Dolphin (Maytronics) Nautilus EON 120d](https://robotsforthat.com/robot/dolphin-nautilus-eon-120d/index.md)