ES 800
Limited evidenceRead the findings →A light corded robot from BWT's Essential range, with a swivelling cable designed to stop tangles. It's aimed at smaller pools and anyone whose last robot's cable kept twisting. BWT's web shop no longer lists it, so you'll need to find a dealer.
See the alternatives below, or switch market.
Where it sits in BWT’s range
- ES NanoSmall cordless robot for the floor and waterline
- ES 800This model
- COSMY 200Same weight and pump rating, shorter cable, 10m pools
- ES EchoCordless ES model for pools up to 15m
- ES 1500Pricier corded ES model, also rated for 12m pools
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What we know
Per BWT Robotics, the ES 800 is a 5.75kg corded robot that cleans the floor, walls and waterline on 1.5, 2 or 2.5-hour cycles, with an 18-metre swivel cable and a cable-control system meant to stop tangles. BWT's BWT page describes the same cycles but gives both 12 and 15 metres as the pool limit. BWT's own web shop no longer lists it, and the maker points buyers to its dealers. Everything here comes from those two BWT pages.
A swivel cable to stop tangles
Tangled cables are the classic complaint about corded robots, and this is BWT's answer. Per BWT Robotics, the ES 800 has an 18-metre floating cable with a swivel, plus a patented cable-control system that uses the robot's sensors to adjust its route in real time so the cable doesn't twist. Being corded, it has no battery to wear out or recharge between runs.
Light, with three cycle lengths
At 5.75kg, the ES 800 is light for a robot that climbs walls, and BWT Robotics says water drains out quickly as you lift it. You choose a 1.5, 2 or 2.5-hour cycle in BWT's app, and the robot cleans the floor, walls and waterline. BWT rates the pump at 15 cubic metres an hour and uses a PVC brush. BWT describes the same three cycles.
Finding its way round the pool
BWT Robotics says a built-in gyroscope lets it adapt its driving pattern to the shape of your pool, that it can turn on the spot to avoid scattering debris, and that it detects beach entries. Even the size limit is muddled: the robotics site says 12 metres, while BWT gives both 12 and 15 metres on the same page.
Filter and warranty
The filter lifts out from the top for rinsing, and a full-filter warning tells you when it needs doing, per BWT Robotics. The warranty is three years on all components, a year longer than the COSMY 200's. BWT's web shop no longer lists the ES 800, and BWT Robotics points buyers to its accredited dealers.
What's not checked yet
Everything above comes from BWT Robotics and BWT, so it tells you how the ES 800 is meant to work. Nobody independent has checked how completely it covers a real pool, how it copes with steps, benches and corners, whether the cable-control system really stops tangles over a season, or what the filter catches, since BWT doesn't give the mesh size. That's too little for us to give it an overall review label.
Our take
Should you buy the ES 800?
Best for: Pools whose owners want a light cleaner and do not mind a power cable. Skip it if: You want a stronger record in independent tests before buying.
Consider it if you want a light corded robot, your pool is under 12 metres, and a tangled cable spoiled your last one. Until someone tests it, a robot with independent reviews is the safer bet: the WYBOT C2 is a cordless option two testers found simple and effective, and the Aiper Scuba S1 is light and cordless, though its tests were mixed.
The ES 800 is one of BWT's Essential corded robots, sold through BWT's pool dealers. It weighs 5.75kg, cleans the floor, walls and waterline on cycles of 1.5, 2 or 2.5 hours chosen in BWT's app, and plugs in through an 18-metre floating cable with a swivel. BWT's cable-control system is meant to adjust the robot's route so the cable doesn't tangle, and a gyroscope helps it adapt to your pool's shape.
The catch is buying one: BWT's web shop no longer lists it, so you go through an accredited dealer. BWT's pages don't even agree on the pool size: its robotics site says 12 metres, while its US page says both 12 and 15. The ES 800 shares its weight, pump rating and cycles with the COSMY 200, which has a shorter cable and a shorter warranty.
Before you buy
The questions people ask about this one
Does it climb walls and clean the waterline?
BWT says it cleans the floor, walls and waterline of pools up to 12 metres, in any shape or finish, per the specifications. We found no independent test of how well it does that, so treat it as a claim.
Is it cordless?
No. It runs through an 18-metre floating cable with a swivel, per the specifications. BWT's cable-control system is meant to steer the robot so the cable doesn't twist, but we've seen no test of that over a season.
How do I get it out of the pool?
It weighs 5.75kg, and BWT says water drains out fast as you lift it, per the specifications, so it should be easier to lift than most wall-climbing robots. BWT doesn't say whether it parks at the wall, so you may need to pull it in by the cable.
How do I clean the filter?
Lift the filter out from the top and rinse it. A full-filter warning tells you when it's due, per the specifications. BWT doesn't give the mesh size, and we've seen no report on how easy it is to clean or how much fine dust it catches.
Does it need an app?
You pick its cleaning cycle of 1.5, 2 or 2.5 hours in BWT's app, which also works as a remote control, per BWT Robotics. We found no test of the app, so we can't say how reliable it is.
Alternatives
Other robotic pool cleaners to compare.
C2
Why consider it: It's cordless, so there's no cable to tangle, 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 it climbs walls; EFTM found it cleaned its pool thoroughly over a few months.
The compromise: PCWorld found it never reached whole sections of its pool.
E35i
Why consider it: Another corded European robot for pools up to 12 metres, with app control and waterline cleaning.
The compromise: We found no hands-on test of it either.
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 800?
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
Sources
- BWT Robotics: BWT Essential ES800 ↗Manufacturer
- BWT: BWT ES800 Pool Robot (US) ↗Manufacturer
Videos
- BWT Pools: BWT ES 800 Corded Robotic Pool Cleaner 1080p ↗
- Search YouTube for BWT ES 800 ↗Search results may include company demonstrations or similar models. Check the source and model name; a demonstration is not an independent performance test.