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
The Dolphin Sigma is the better robotic pool cleaner overall, rated 3.7 to 3.0. The Dolphin Sigma leads on warranty. The Hayward TigerShark QC wins on value. The Hayward TigerShark QC costs $910 less ($1,489 vs $2,399).
Hayward TigerShark QC
#34 in CordedFull review
The TigerShark with a quick 90-minute cycle, worth the small premium for most buyers.
Leslie's $1,489 Walmart $1,489 ePoolSupply $1,489$1,489
Prices were last checked October 21, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Dolphin Sigma for warranty (3-year warranty vs 1-year warranty).
- Choose the Hayward TigerShark QC for value ($1,489 vs $2,399).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every corded robotic pool cleaner; a clear win is highlighted. How we rank explains each one.
| Factor weight | Dolphin Sigma | Hayward TigerShark QC |
|---|---|---|
| Overall rating | 3.7/5 | 3.0/5 |
| Value 25% | 2 $2,399 | 23 $1,489 |
| Cleaning 25% | 85 Floor, walls and waterline | 85 Floor, walls and waterline |
| Navigation 15% | 50 navigation not published (neutral score used) | 35 Programmed pattern |
| Warranty 15% | 100 3-year warranty | 0 1-year warranty |
| Pool size 10% | 100 pools up to 50 ft long (about 1,250 sq ft) | 56 pools up to 40 ft long (about 800 sq ft) |
| Features 10% | 100 3 of 3 | 50 too few features published (neutral score used) |
Specifications
| Dolphin Sigma | Hayward TigerShark QC | |
|---|---|---|
| Pool | ||
| Pool size (rated) | Up to 50 ft long | Up to 40 ft long |
| Pool types | In-ground | In-ground |
| Surfaces | - | Gunite, vinyl, fiberglass, pebble |
| Cleaning | ||
| Cleans | Floor, walls and waterline | Floor, walls and waterline |
| Surface skimming | No | No |
| Filter | Fine Filter Kit, top access; extra Ultra-Fine Filter Kit in the box | Cartridge filter |
| Water flow | 4,500 gal/h | - |
| Power | ||
| Power | Corded | Corded, 55 ft cable |
| Run time | Longest cycle 2 h 30 min | Longest cycle 4 h |
| Swivel cable | Yes | - |
| Navigation & app | ||
| Navigation | - | Programmed pattern |
| App | Yes | No |
| Connectivity | Bluetooth | - |
| Scheduling | Yes | - |
| Build | ||
| Weight | 24.6 lb (11.2 kg) | 21.5 lb (9.8 kg) |
| Warranty | 3 years | 1 year |