ES Echo
Limited evidenceRead the findings →BWT's cordless wall-climbing pool robot for larger pools, with a battery you can replace. It drives in planned lanes and gets the walls and waterline done. The catch: it stirs up a lot of dirt and leaves corners dirty.
See the alternatives below, or switch market.
Where it sits in BWT’s range
Feedback
What we know
The one hands-on account is from Poolpanda, a German affiliate site that links to shops, so we don't count it as independent. It ran the ES Echo in a round pool and a very dirty rectangular one, and found the ultrasonic route planning worked, the walls and waterline got done, and a charge lasted two and a half to three hours. But it stirred up a lot of dirt, left corners dirty and let debris flow back out when lifted. The rest comes from BWT and BWT Robotics.
Poolpanda, hands-on (Tested in a round pool and a very dirty rectangular pool; Affiliate site that links to shops selling the robot, so we don't count it as an independent test.)
Planned lanes, but a lot of swirl
BWT Robotics says an ultrasonic sensor and gyroscope let the ES Echo plan its route and turn on the spot to avoid scattering debris. Poolpanda found the route planning worked fairly well, if not with perfect precision, and it clearly cleaned one end systematically before moving on. In a very dirty rectangular pool, though, it stirred up a lot of debris and flung it elsewhere rather than sucking it up, so over more than 100 minutes it had to cover the whole pool several times. The pool ended up much cleaner, but not spotless.
Walls and waterline are its strength
Poolpanda found it climbed the walls right up to the waterline very often, even with plenty of dirt already in the basket, and it vacuumed the edges of a round pool well, where many robots struggle. Corners were its weak spot. In the rectangular pool they were left visibly dirty, and Poolpanda notes a WYBOT C2 got them nearly perfect. BWT Robotics lists separate modes for the floor only, or the walls and waterline only.
No fine filter, and some leakage
The robot has a 4-litre, 180-micron filter, per BWT Robotics, with a warning when it's full. Poolpanda found the lid and basket easy to open and close, but thinks a fine filter should come in the box at this level. Its workaround, filter balls in the basket, doesn't suit a robot that also cleans the walls. Worse, some of the collected dirt flowed back into the pool when Poolpanda lifted the robot out.
Battery, charging and parking
BWT claims up to two and a half hours from the replaceable 7,800mAh battery, per BWT Robotics. Poolpanda got two and a half to about three hours, and recharging took about three hours. When the battery runs low it drives to the edge so you can hook it out, and BWT says it also parks by a wall at the end of each cycle. At 7.9kg dry, it felt heavier to Poolpanda than small floor robots, but reasonable for what's inside.
Our take
Should you buy the ES Echo?
Best for: Pools whose owners want a cordless cleaner with a replaceable battery. Skip it if: You want a stronger record in independent tests before buying.
Consider it if you want a cordless robot for a larger pool and like the idea of replacing the battery rather than the robot. Until independent tests appear, the WYBOT C2 is a cordless alternative that two testers found simple and effective, and one Poolpanda found cleaned corners better. If fine dirt is your main problem, the Aiper Scuba S1 offers an optional ultra-fine filter.
The ES Echo is the cordless wall-climber in BWT's Essential range, above the smaller ES Nano. It cleans the floor, walls and waterline for up to two and a half hours, uses an ultrasonic sensor and a gyroscope to drive in planned lanes rather than wandering, and parks by a wall when it's done so you can hook it out. The battery is replaceable, which BWT says lengthens the robot's life.
The catch is how it handles dirt. In a hands-on run by Poolpanda, a German affiliate site that links to shops, the route planning worked and the walls got done, but the robot stirred up a lot of dirt, left corners dirty and let some debris flow back out as it was lifted. There's no fine filter in the box either, just a 180-micron basket.
Before you buy
The questions people ask about this one
Does it climb walls and clean the waterline?
Yes. It cleans the floor, walls and waterline, per the specifications, and has a mode for the walls and waterline only. Poolpanda found it climbed right to the waterline very often, even with a fairly full basket.
Is it cordless, and how long does a charge last?
Yes. BWT claims up to two and a half hours from a replaceable 7,800mAh battery, per the specifications. Poolpanda got two and a half to about three hours, with roughly three hours to recharge.
Will it work in an above-ground pool?
BWT says it suits in-ground and above-ground pools up to 15 metres long, per BWT. Poolpanda tested it in a round pool and a rectangular one, and found it cleaned the edges of the round pool well.
How do I get it out of the pool?
It parks by a wall at the end of a cycle and when the battery runs low, and you lift it out with the included hook, per BWT Robotics. Poolpanda found some collected dirt flowed back into the pool as it came out.
Does it handle leaves as well as fine dirt?
It's better with leaves. The basket filters down to 180 microns and there's no finer filter in the box, per the specifications. Poolpanda found it also stirred up a lot of fine dirt while cleaning, so a silty pool may need extra runs.
Does it need an app?
Not to run it, but BWT's app over Wi-Fi and Bluetooth lets you pick modes and cycles, follow progress and get software updates, per BWT Robotics. We found no independent test of the app.
Alternatives
Other robotic pool cleaners to compare.
C2
Why consider it: It's cordless, and two testers found it simple and effective on everyday debris.
The compromise: A third tester found the suction weak and the weekly timer limiting.
Scuba S1 2026
Why consider it: Light and cordless, and its current edition offers an optional ultra-fine filter.
The compromise: PCWorld found the earlier edition never reached whole sections of its pool.
Sora 10
Why consider it: Light, simple and cordless, and it cleans the walls and waterline too.
The compromise: Testers found it wanders, skips steps, and may sink again if you're slow to collect it.
Specs
Full specifications
Each specification names its source. Manufacturer claims are not independent test results; unconfirmed figures are labelled.
Owner reviews
Do you own the ES Echo?
Tell people how it’s held up: cleaning, maintenance, faults and support. Owner accounts are shown separately from independent reviews.
Sources
Where this page’s findings come from
Editorial reviews
- Poolpanda: BWT ES Echo Akku Poolroboter für Boden + Wand + Wasserlinie ↗Hands-on · Tested in a round pool and a very dirty rectangular pool · Affiliate site that links to shops selling the robot, so we don't count it as an independent test. (not counted towards our two-review minimum)
Sources
- BWT: BWT Battery Pool Robot ES Echo ↗Manufacturer
- BWT Robotics: BWT Essential ES Echo ↗Manufacturer
Videos
- BWT Pools: BWT ES Echo Cordless Robotic Pool Cleaner 1min 1080p ↗
- BWT ES ECHO: ES ECHO Release to Pool ↗
- Search YouTube for BWT ES Echo ↗Search results may include company demonstrations or similar models. Check the source and model name; a demonstration is not an independent performance test.