Dolphin Sigma
#6 in CordedFull review
A top dealer-line robot for large in-ground pools, with a three-year warranty.
Pool Express $2,399$2,399
3.7/5
A well-equipped Wi-Fi robot for 50 ft pools, for owners who want a filter-full warning and a caddy.
- 50 ftPool size
- To waterlineCleans
- 2 yearsWarranty
Check price at Maytronics$1,329Check price at Pool Express$1,629
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Multi-layer filter traps fine and coarse debris
- Full-filter indicator tells you when to empty it
- Wi-Fi app, weekly timer and three cycle lengths
- Comes with a caddy
Cons
- Two-year warranty, less than the E40
- Prices vary by about $300 between stores
- Over 19 lb to lift out
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Pool | |
|---|---|
| Pool size (rated) | Up to 50 ft long |
| Pool types | In-ground and above-ground |
| Cleaning | |
| Cleans | Floor, walls and waterline |
| Surface skimming | No |
| Filter | Multi-Layer, top access |
| Water flow | 4,000 gal/h |
| Power | |
| Power | Corded |
| Run time | Longest cycle 2 h 30 min |
| Swivel cable | Yes |
| Navigation & app | |
| App | Yes |
| Connectivity | Wi-Fi |
| Scheduling | Yes |
| Caddy included | Yes |
| Build | |
| Weight | 19.2 lb (8.7 kg) |
| Warranty | 2 years |
Alternatives in this type
Dolphin Advantage Ultra
#7 in CordedFull review
A full-coverage scheduled robot for pools up to 50 ft, for owners who do not want an app.
Amazon $899$899
Dolphin Premier
#9 in CordedFull review
For leafy in-ground pools up to 50 ft where filter capacity matters more than app control.
Pool Express $1,999$1,999
Compare
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