Select and compare
BWT ES Nano vs. Dreame J1 compared
Robotic Pool Cleaner
At a glance
The key numbers for both devices side by side.
Overall rating
5454Schwach
5959Schwach
Value for money
26Mediocre
41Okay
Best price
€499.00
€299.00€599.00−50 %
Price advantage
—
€200.00 cheaper
Offers
1 shop
1 shop
Rank in category
Rank 45 of 45
Rank 42 of 45
Rating
Sub-ratings compared
BWT ES NanoOverall rating 54Dreame J1Overall rating 59
BWT ES NanoDreame J1
Cleaning results54/10066/100
Navigation & reliability50/10038/100
Runtime & endurance56/10068/100
Handling & maintenance56/10072/100
App & build quality52/10048/100
Cleaning results
54
66
Navigation & reliability
50
38
Runtime & endurance
56
68
Handling & maintenance
56
72
App & build quality
52
48
Specs
Specs compared
Key specs
Brand
Model
ES Nano
J1
Cleaning coverageAreas the robot cleans according to the manufacturer – only with walls and waterline is no dirt ring left; top models also skim leaves from the surface, pure skimmers clean only the surface
FloorWallsWaterline
WaterlineFinish
Max. pool areaLargest pool area according to the manufacturer in m² – some manufacturers state only the pool length instead
50 m² (538 sq ft)
Power supplyBattery or floating cable according to the manufacturer – battery robots don’t get tangled, corded robots run without a break
Battery (cordless)
Battery (cordless)
Suitable forPool types the manufacturer approves the robot for
In-ground poolAbove-ground pool
Above-ground poolIn-ground pool
NavigationHow the robot moves according to the manufacturer – systematic navigation and mapping cover the pool faster and more completely
Systematic (gyroscope)
Random
Battery lifeRuntime per charge in the standard program according to the manufacturer in minutes
180 min
Cleaning
ChassisHow the robot moves according to the manufacturer – tracks climb walls and steps and roll over liner folds, wheels and rollers get stuck on edges more easily; propellers drive floating skimmers
Propellers (floating)
Brush typeType of main brushes according to the manufacturer – PVC, nylon and plastic brushes count as bristles, PVA is the absorbent foam roller that also grips smooth tiles; a "combined brush" usually means bristles plus PVA
Bristles
Saltwater compatibleThe manufacturer explicitly approves the robot for saltwater pools – if not stated, the field stays empty
Yes
Yes
Flow rateVolume of water the pump draws through the filter per hour according to the manufacturer, in m³/h – a higher flow rate also picks up heavy debris
13 m³/h
Cleaning programsCleaning programmes according to the manufacturer – "Smart", "Auto" or "Standard" is the full clean of floor and walls, "Quick" or "Turbo" the quick programme, "Enhanced" or "Ultra" the intensive programme; a quick programme is enough for the daily round
Floor onlyWalls onlyFloor and walls
WaterlineSurface (skimmer)
Suitable pool surfacesPool surfaces the manufacturer approves the robot for – "pebble" and pebble plaster count as concrete, "vinyl" and "liner" as liner, fibreglass and GRP as polyester
TilesVinyl linerConcretePolyesterMosaic tile
Program durationDuration of the standard program according to the manufacturer in minutes
150 min
Filter & maintenance
Filter typeType of debris container according to the manufacturer
Filter basket
Filter capacityFilter capacity according to the manufacturer in liters
5 l (1.3 gal)
Filter finenessFineness of the finest included filter according to the manufacturer in microns – the smaller the number, the finer the filter, but it clogs faster
180 µm
200 µm
Battery & cable
Charging timeCharging time from empty to full according to the manufacturer in minutes
360 min
240 min
ChargingHow the battery is charged according to the manufacturer – with a plug on the device the socket must be dry; a dock sometimes also rinses the filter but then needs a water connection
Charging cable on the device
Charging cable on the device
Controls
Obstacle detectionHow the robot detects walls, steps and obstacles according to the manufacturer – with ultrasound, laser or camera before it bumps into them; "ultrasonic radar" and "sonar" are ultrasound, 3D ToF and point laser are laser/ToF
Infrared
Contact (wall and bump)UltrasonicLaser/ToF
Remote controlA remote control is included, according to the manufacturer
No
App controlCan be controlled via app, not just by remote, according to the manufacturer
Yes
Yes
RetrievalHow the robot is ready for removal after cleaning according to the manufacturer – without a retrieval aid it stays on the bottom and has to be fished out with a hook
Parks at the pool edge
Recall via app
Dimensions & weight
WeightWeight of the robot according to the manufacturer in kg, without water and without the cart – matters when lifting it out
7.5 kg (17 lb)
8 kg (18 lb)
Water depth up toMaximum water depth the manufacturer approves the robot for, in m
4 m (13 ft)
Pool length up toMaximum pool length the manufacturer approves the robot for, in m
10 m (33 ft)
Transport cart includedA cart for storing and moving the robot is included, according to the manufacturer
No
DimensionsExternal dimensions according to the manufacturer in cm (W × D × H)
40 × 22 × 37 cm (16 × 8.7 × 15 in)
48.6 × 56 × 22 cm (19 × 22 × 8.7 in)
General
Warranty
2 years
Model year
2025
In the box
Poolskimmer, Ladegerät, Rückholhaken, Benutzerhandbuch, Kurzanleitung
Prices
Offers
Verdict
Pros & cons
Der BWT ES Nano ist ein schlichter Akku-Poolroboter für kleine Becken bis 10 m, der ohne Kabel Boden und Wände abfährt und am Ende am Rand parkt. Der wechselbare Akku reicht für genau einen Lauf von 150 min. Der Haken: Wie gründlich er Wasserlinie und Stufen reinigt, ist kaum belegt, und der 180-µm-Filter lässt Feinstaub durch.
Pros
- Kabellos: kein Schwimmkabel, kein Netzteil am Beckenrand
- Akku mit 4500 mAh wechselbar, verlängert die Lebensdauer
- Parkt nach dem Programm am Beckenrand, kein Haken nötig
- Salzwasser bis 4.000 ppm zulässig
- Modus auch ohne App direkt am Gerät wählbar
Cons
- Filter mit 180 µm hält Feinstaub und Pollen kaum zurück
- Eine Ladung reicht nur für einen Lauf, Laden dauert 5 bis 6 h
- Mit 7,5 kg trocken schwerer als die Kabelmodelle der Serie
- Keine Ladestation, Filter muss nach jedem Lauf gespült werden
- WLAN nur im 2,4-GHz-Netz
Der Dreame J1 ist ein schwimmender Solar-Skimmer, der Laub und Insekten von der Oberfläche fischt und die Wasserlinie bürstet – Boden und Wände erreicht er nie. Als Ergänzung zum Bodenroboter in einem sonnigen, windgeschützten Becken erspart er dir das tägliche Keschern. Der Haken: Die Umwälzpumpe muss aus sein, sonst treibt er ab, und Propellerfehler erzwingen Neustarts.
Pros
- Hält Wasseroberfläche frei von Blättern und Insekten, Kescher wird seltener nötig
- Bürstet die Wasserlinie mit zwei Seitenbürsten in eigenem Randmodus
- Filterkorb mit 5 l und 200 µm hält Laub, Haare und Insekten zurück
- 18-W-Solarpanel lädt bei Sonne nach, Skimmer sucht selbst die hellste Stelle
- Parkt per App am Beckenrand, bleibt während der Fahrt erreichbar
- Fach für Chlortabletten im Filterkorb
Cons
- Umwälzpumpe muss aus sein, sonst treibt der Skimmer durchs Becken
- Propellerfehler stoppen das Gerät wiederholt, Neustart nötig
- Wind bringt ihn vom Kurs und stört die geordnete Bahn
- Kann sich im Einlauf-Skimmer des Beckens festsetzen
- Geordnete S-Bahn nur im versteckten Labor-Modus der App
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