Dreame Z1
#1 in CordlessFull review
A strong-value cordless robot for small-to-mid-size pools whose owners want long runtime and real navigation for about $300. Fine silt needs a robot with a finer filter.
Dreame $299$299
The Dreame Z1 is the better robotic pool cleaner overall, rated 4.5 to 3.8. The Seauto SAT20 costs $119.01 less ($179.99 vs $299).
Seauto SAT20
#29 in CordlessFull review
A bare-bones cordless floor-and-wall cleaner for budget buyers with smooth above-ground pools. Buyers who want sonar navigation and waterline scrubbing should step up to the Seauto SAT 25.
Amazon $179.99$179.99
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every cordless robotic pool cleaner; a clear win is highlighted. How we rank explains each one.
| Factor weight | Dreame Z1 | Seauto SAT20 |
|---|---|---|
| Overall rating | 4.5/5 | 3.8/5 |
| Value 25% | 92 $299 | 100 $180 |
| Cleaning 25% | 85 Floor, walls and waterline | 60 Floor and walls (waterline not stated) |
| Navigation 15% | 85 Ultrasonic + 3D structured light | 50 navigation not published (neutral score used) |
| Warranty 15% | 50 2-year warranty | 50 warranty not published (neutral score used) |
| Pool size 10% | 100 pools up to 1,950 sq ft | 100 pools up to 2,100 sq ft |
| Features 10% | 100 2 of 2 | 0 0 of 2; no app control, caddy |
Specifications
| Dreame Z1 | Seauto SAT20 | |
|---|---|---|
| Pool | ||
| Pool size (rated) | Up to 1,950 sq ft (181 m²) | Up to 2,100 sq ft (200 m²) |
| Pool types | In-ground and above-ground | Above-ground and in-ground |
| Surfaces | Concrete, vinyl, fiberglass, tile | - |
| Max depth | 8.2 ft | 9.8 ft |
| Cleaning | ||
| Cleans | Floor, walls and waterline | Floor and walls |
| Surface skimming | No | No |
| Filter | 180 µm filter basket | 300 µm filter basket |
| Filter capacity | 4.5 L | - |
| Water flow | 8,000 gal/h | - |
| Power | ||
| Power | Cordless (battery) | Cordless (battery) |
| Battery | 194.4 Wh, 9,600 mAh | 7,800 mAh |
| Run time | Up to 5 h | Up to 2 h 30 min |
| Charge time | 6 h | 4 h |
| Charging | Magnetic connector | Cable |
| Navigation & app | ||
| Navigation | Ultrasonic + 3D structured light | - |
| App | Yes | No |
| Retrieval | Climbs to the waterline for pickup when done or low on battery | - |
| Caddy included | - | No |
| Build | ||
| Water resistance | - | IPX8 |
| Weight | 16.6 lb (7.5 kg) | 13.2 lb (6 kg) |
| Warranty | 2 years | - |