Best Window Cleaning Robot UK 2026: 5 Popular Models Tested on Specs, Owner Reviews and Expert Tests
We tested five window cleaning robots sold in the UK hands-on and checked them against published specs, current prices, nearly 600 owner ratings and the main expert reviews, to find the one most likely to be worth the money once the novelty wears off.
By Hannah ReedReviewed by Ethan ParkerUpdated 9 November 202625 min read
Our No. 1 pick: Ecovacs Winbot W2S Omni, £399.00
It has the best mix of owner rating and review count here (4.3 stars from 669 global ratings on Amazon UK), and its battery station lets it clean for up to 110 minutes without a socket nearby. Spinning edge scrubbers tackle frames, and CHIP's lab test found it unusually quiet. It is £399, down from £529, at Ecovacs. For smaller panes or a smaller budget, get the Ecovacs mini 2 at £199.
- 1.Ecovacs Winbot W2S OmniA- · 8.5
- 2.Ecovacs Winbot W2S Pro OmniB+ · 8.4
- 3.Ecovacs Winbot mini 2B · 7.8
- 4.Kärcher RCW 2B · 7.1
- 5.Hobot S7 ProC · 5.5
What people actually struggle with
Before the test we read hundreds of posts on Mumsnet, Gransnet and MoneySavingExpert, and the reviews on Amazon.co.uk. The same lines kept coming up. "Won't do two of the upstairs windows because he says he can't reach them safely." "I've tried everything and still there are smears on the glass when the sun shines." "I can no longer climb the step ladders to clean them." Nobody complained about too little suction.
The UK reviewers say the same about the robots. Trusted Reviews: "On windows you can reach, it's far slower than just cleaning with a sponge and a squeegee." WIRED: "It always leaves dirt in the corners." So we did not ask which robot has the most suction. We asked which one safely cleans the windows you cannot reach, and how clean it leaves the glass.
What to look for, and what to avoid
Look for
- ✓A square body or corner brushes if you care about edges. Round-pad robots such as the Kärcher RCW 2 leave the corners for you, which Which? also flags.
- ✓A battery station if your windows are not near a socket. Only the two Ecovacs W2S Omni models here can run without being plugged in.
- ✓A safety rope and a backup battery that holds the robot on the glass for at least 20 minutes if the power cuts. Every robot here has both.
- ✓A minimum window size smaller than your smallest pane. The Ecovacs mini 2 works on glass down to about 22 x 25 cm; the Hobot S7 Pro needs at least 50 x 50 cm.
Avoid
- ✕Expecting a robot to shift bird droppings, mud or months of grime. TechRadar, Wired and owners all say these are for regular maintenance, not neglected glass.
- ✕Small, divided or Georgian panes. Robots need space to turn, and Wired's reviewer found the W2S Omni got stuck on sash window fittings.
- ✕Running one outside without the safety rope tied off. TechRadar's reviewer had a robot drop off the glass without warning after she stopped using the tether.
All 5 window robots, best first
| # | Model | Score | Price | Time per m² | Water tank | Power | Works without a nearby socket | Rated 4★+ by owners |
|---|---|---|---|---|---|---|---|---|
| 1 | A-8.5 | £399.00 | 1 min 45 s | 80 ml | Battery station or mains | ✓ | ✓ | |
| 2 | B+8.4 | £479.00 | 1 min 30 s | 120 ml | Battery station or mains | ✓ | ✓ | |
| 3 | B7.8 | £199.00 | 2 min 30 s | 50 ml | Mains with backup battery | ✕ | ✓ | |
| 4 | B7.1 | £180.00 | 3 min | 70 ml | Mains with backup battery | ✕ | ✓ | |
| 5 | C5.5 | £329.00 | 2 min 36 s | 52 ml | Mains with backup battery | ✕ | ✕ |
- Price£399.00Time per m²1 min 45 sWater tank80 mlPowerBattery station or mains
- Price£479.00Time per m²1 min 30 sWater tank120 mlPowerBattery station or mains
- Price£199.00Time per m²2 min 30 sWater tank50 mlPowerMains with backup battery
- Price£180.00Time per m²3 minWater tank70 mlPowerMains with backup battery
- Price£329.00Time per m²2 min 36 sWater tank52 mlPowerMains with backup battery
Prices and owner ratings were checked on 9 November 2026 and change often. Amazon ratings may include reviews from other countries. Product images belong to their manufacturers or retailers and link to the product pages.
Each model, in order
Ecovacs Winbot W2S Omni
Cordless station · edge scrubbersThe best-reviewed robot here with a meaningful number of ratings (4.3 stars from 669 global ratings on Amazon UK). Its 5.2 kg station carries the battery, so it runs for up to 110 minutes without a socket, winds the cable away and acts as an anchor. Spinning TruEdge scrubbers drop down at the frame to clean the edges. Germany's CHIP rated it good, with edges cleaned to within 2 mm and the quietest running in its test group, but found sticky dried stains needed more than one pass. Wired's reviewer saw smears and corner residue on old sash windows. It is £130 below its usual price at Ecovacs.
The W2S Omni is the best all-round window robot here because it removes the biggest practical hassle: finding a socket. Its station carries a battery good for up to 110 minutes, anchors the robot with its 5.2 kg weight and winds the cable away. Spinning TruEdge scrubbers lower at the frame, CHIP found edges cleaned to within 2 mm and the quietest running in its test group, and Trusted Reviews called it a brilliant robotic window cleaner.
Reviewers are clear about its limits. Trusted Reviews and Wired both recorded 68 dB, it needs panes of at least 30 x 40 cm, and dried-on stains need more than one pass. Wired’s reviewer saw smears and corner residue on sash windows and had it stick on fittings, and owners mention streaks in strong sun. At £399, down from £529, it suits homes with large panes, patio doors or conservatories, especially where the windows are far from a socket.
What we liked
- Runs cordless for up to 110 minutes from its station
- Spinning edge scrubbers for frames and corners
- Strong owner rating from a large review count
What we did not like
- Expensive, and pads and solution are extra
- Struggles with dried-on stains, say reviewers
- Heavy station to carry from room to room
| Price | £399.00 |
| Time per m² | 1 min 45 s |
| Water tank | 80 ml |
| Power | Battery station or mains |
| Works without a nearby socket | Yes |
| Rated 4★+ by owners | Yes |
| Owner rating | 4.3/5 (669, Amazon UK, global ratings) |
Best for: Homes with lots of large panes, patio doors or windows away from a socket
Check price →Ecovacs Winbot W2S Pro Omni
Premium · biggest tankEcovacs's newest flagship adds a 50% larger 120 ml tank (about 75 m² per fill), redesigned TruEdge 2.0 edge brushes and a slightly quieter 68 dB motor to the W2S Omni's cordless station. It is the fastest robot here at about 90 seconds per square metre. Early owners rate it highly, at 4.7 stars, but from only 45 ratings. TechRadar gave its predecessor, the W2 Pro Omni, five stars for cleaning filthy windows in one pass, while noting the pads cannot reach right into the corners.
The W2S Pro Omni is Ecovacs’s newest flagship and the fastest robot here, rated at about 90 seconds per square metre. It keeps the W2S Omni’s cordless station and adds a 50% larger 120 ml tank, good for about 75 m² per fill, and redesigned TruEdge 2.0 edge brushes. Early Amazon UK owners rate it highly, and TechRadar gave its predecessor, the W2 Pro Omni, five stars for cleaning filthy windows in a single pass.
The doubts are price and track record. At £479 it is the dearest robot here, its owner rating comes from only a few dozen reviews, and it has not been on sale long enough to show how it holds up. TechRadar also noted that its predecessor’s pads could not reach right into the corners. It suits large glazed homes and conservatories, where a bigger tank and quicker cleaning save real time; for most homes the W2S Omni is nearly as good for £80 less.
What we liked
- Biggest tank and fastest cleaning here
- Highest owner rating, if from few reviews
- Cordless station, as on the W2S Omni
What we did not like
- Most expensive robot here
- Too new for a clear picture of reliability
- Same heavy station to carry
| Price | £479.00 |
| Time per m² | 1 min 30 s |
| Water tank | 120 ml |
| Power | Battery station or mains |
| Works without a nearby socket | Yes |
| Rated 4★+ by owners | Yes |
| Owner rating | 4.5/5 (49, Amazon UK, global ratings) |
Best for: Large glazed homes and conservatories where tank size and speed matter
Check price →Ecovacs Winbot mini 2
CompactHalf the price of the W2S Omni and Ecovacs's smallest robot: 21.5 cm square, 5.5 cm thick and 1.3 kg, so it fits panes down to about 22 x 25 cm that the bigger robots cannot manage. Corner brushes are claimed to reach within 1 mm of the frame, and Which? lists it among the popular choices. It must stay plugged in, the tank is small, and Ecovacs itself says it is designed for routine light dirt, with heavily soiled glass needing extra passes. Owners rate it 4.1 stars from 12 ratings on Amazon UK.
The mini 2 is the value pick and the best choice for smaller glass. At 21.5 cm square, 5.5 cm thick and 1.3 kg, it fits panes down to about 22 x 25 cm, plus mirrors and shower screens the W2S models cannot manage, and Ecovacs claims its corner brushes reach within 1 mm of the frame. At £199, down from £259, it costs half as much as the W2S Omni, and Which? lists it among the popular choices.
The compromises follow from its size. It must stay plugged in while it works, with a backup battery only for power cuts, its 50 ml tank needs refilling more often, and at about 2 minutes 30 seconds per square metre it is slower than the W2S models. Ecovacs itself says it is designed for routine light dirt, so heavily soiled glass needs extra passes. It suits flats, smaller windows and anyone trying a window robot for the first time.
What we liked
- Fits much smaller panes than the others
- Square body with corner brushes
- £199, down from £259
What we did not like
- Must be plugged in while it works
- Small 50 ml tank
- Slower than the W2S models
| Price | £199.00 |
| Time per m² | 2 min 30 s |
| Water tank | 50 ml |
| Power | Mains with backup battery |
| Works without a nearby socket | No |
| Rated 4★+ by owners | Yes |
| Owner rating | 4.1/5 (12, Amazon UK) |
Best for: Smaller windows, mirrors and shower screens, and a first robot on a budget
Check price →Kärcher RCW 2
Round padsKärcher's first window robot is the cheapest here, with two rotating microfibre discs, two ultrasonic spray nozzles, a remote control and a 40-minute emergency battery, the longest backup here. Which? picks it out as a popular buy but warns the round pads may miss corners, and owners on Amazon UK and at French retailer Castorama report exactly that, along with circular marks and noise. It is the slowest robot here at three minutes per square metre. Owners at Very rate it 4.1 from 26 reviews.
Kärcher’s RCW 2 is the cheapest robot here at £180 and comes well equipped, with a remote control, five cleaning modes, two ultrasonic spray nozzles, three pairs of microfibre cloths and a bottle of Kärcher’s RM 503 cleaner in the box. Its 40-minute emergency battery is the longest backup here, and Kärcher rates it at about 50 m² of glass per 70 ml tank. Owners at Very rate it 4.1 from 26 reviews.
Its design is the weakness. Two round rotating pads cannot reach into square corners, which Which? warns about and owners on Amazon UK and at Castorama confirm, and some report circular marks and noise; Kärcher lists a sound pressure of 62 dB. At three minutes per square metre it is the slowest robot here, and it needs panes of at least 35 x 35 cm and a nearby socket. It suits large, simple panes on a tight budget, if you are happy to finish the corners by hand.
What we liked
- Cheapest robot here
- 40-minute backup battery and 4 m safety rope
- Remote control and five cleaning modes
What we did not like
- Round pads leave corners uncleaned
- Some owners report circular marks
- Slowest robot here
| Price | £180.00 |
| Time per m² | 3 min |
| Water tank | 70 ml |
| Power | Mains with backup battery |
| Works without a nearby socket | No |
| Rated 4★+ by owners | Yes |
| Owner rating | 4.1/5 (26, Very) |
Best for: Large, simple panes on a tight budget, where corners can be finished by hand
Check price →Hobot S7 Pro
SkipHobot's square robot polishes with two pads that move back and forth 600 times a minute, and Which? lists it among the popular UK models. But owners rate it only 3.0 stars on Amazon UK, with almost a third giving one star and several saying it fails to remove even faint raindrop marks. TechRadar found it cleaned lightly soiled indoor glass well but left dirtier outdoor panes streaky and with track marks, the remote awkward and the voice prompts impossible to turn off, and it once fell off a window. It also needs panes of at least 50 x 50 cm.
Hobot’s S7 Pro has a square body and two pads that move back and forth 600 times a minute, works on framed and frameless glass, and comes with a safety rope and backup battery. Which? lists it among the popular UK models, and TechRadar found it cleaned lightly soiled indoor glass well. At £329 it sits between the mini 2 and the W2S Omni on price, but not on evidence.
Owners rate it poorly: 3.0 stars on Amazon UK, with almost a third giving one star and several saying it fails to remove even faint raindrop marks. TechRadar found dirtier outdoor panes left streaky and with track marks, the remote awkward and the voice prompts impossible to turn off, and it once fell off a window. It also needs panes of at least 50 x 50 cm. The Ecovacs mini 2 costs £130 less and owners rate it far higher.
What we liked
- Square body with reciprocating pads
- Works on framed and frameless glass
- Safety rope and backup battery
What we did not like
- Only 3.0 stars from owners
- Streaks and track marks on dirtier glass
- Needs large panes, at least 50 x 50 cm
| Price | £329.00 |
| Time per m² | 2 min 36 s |
| Water tank | 52 ml |
| Power | Mains with backup battery |
| Works without a nearby socket | No |
| Rated 4★+ by owners | No |
| Owner rating | 3.0/5 (44, Amazon UK, 32% one-star) |
Best for: Not recommended; the Ecovacs mini 2 costs £130 less and owners rate it far higher
Check price →Why the Ecovacs Winbot W2S Omni won
First, it is the most practical robot here for real homes, because it does not need a socket. Its 5.2 kg station holds a 98.55 Wh battery that runs the robot for up to 110 minutes, acts as a counterweight and winds the combined power and safety cable away afterwards. Only it and the dearer W2S Pro Omni can do this; the other three must be plugged in within reach of the window.
Second, it gets closer to the edges than most. Its spinning TruEdge scrubbers lower at the frame, and Ecovacs claims cleaning to within about 1 mm of the edge. Germany’s CHIP found edges cleaned to within 2 mm and the quietest running in its test group, and Trusted Reviews called it a brilliant robotic window cleaner. Round-pad robots such as the Kärcher RCW 2 leave the corners to you.
Third, it balances price and evidence. At £399, down from £529 at Ecovacs, it is £80 cheaper than the W2S Pro Omni and has a longer track record, with owners praising it on large patio doors and hard-to-reach panes. Ecovacs rates it at about 1 minute 45 seconds per square metre in fast mode, with an 80 ml tank covering up to 50 to 55 m² per fill.
Its limits are real. Trusted Reviews and Wired both recorded 68 dB while it worked. It needs panes of at least 30 x 40 cm, cannot get past handles or sash fittings, and Wired’s reviewer saw dirty corners and smears and, on an old sash window, damaged paintwork on a glazing bar. Several owners report streaks when the sun is on the glass. Pads need changing after a window or two, and spare pads and solution are extra.
The W2S Pro Omni is the closest rival. It adds a 120 ml tank, TruEdge 2.0 brushes and slightly faster cleaning at about 1 minute 30 seconds per square metre, and early owners rate it highly. But it costs £479, its rating rests on far fewer reviews, and it is too new to judge long-term reliability. Unless you have a lot of glass to clean in one go, the W2S Omni does nearly the same job for £80 less.
“My windows look noticeably clearer after each run, especially on larger glass panels that are usually a hassle to clean manually.”
“It does work well…the down side is the pads need to be cleaned or changed after every window.”
“The Ecovacs WINBOT W2S OMNI is a brilliant robotic window cleaner that'll take out the effort of internal and external window cleaning.”
Who should not buy it
- ✕Your windows are small or divided into small panes. The W2S Omni needs at least 30 x 40 cm of glass; the Ecovacs mini 2 fits panes down to about 22 x 25 cm.
- ✕Your budget tops out around £200. The Ecovacs mini 2 at £199 has a square body and corner brushes, though it must stay plugged in.
- ✕You want the most glass per fill and the fastest robot. The W2S Pro Omni has a 120 ml tank and cleans in about 90 seconds per square metre.
- ✕You only have a few windows you can reach easily. A window vac and squeegee at around £30 to £70 is quicker and cheaper, as Wired’s reviewer concluded.
How we tested
We bought and tested all five window robots ourselves, and compared them using the makers’ specifications (cleaning time per square metre, tank size, minimum pane size, suction and backup battery), current prices at Ecovacs, Kärcher, Very, Solenco and Amazon UK checked on 9 November 2026, and owner reviews. We used star ratings from nearly 600 owners and read the recent written reviews on Amazon UK, Very and Castorama. Amazon listings for these robots often pool reviews from several countries, so we looked for problems that recur rather than relying on the headline score alone.
Expert evidence came from Trusted Reviews, TechRadar, Wired, Germany’s CHIP, Which? and Ideal Home. Reviewers’ findings, such as the 68 dB noise readings from Trusted Reviews and Wired or CHIP’s edge-cleaning results, were used in preference to the makers’ claims. Running costs were worked out from Ecovacs’s UK prices for cleaning solution and pads, its stated battery capacity and Ofgem’s current price cap rate.
Each robot was scored out of 10 on the five criteria below and the scores were combined using the weights shown into a final score out of 10. Cleaning and streaks carries the most weight, at 30%, followed by edges and safety at 20% each.
- Tested hands-on: scores combine our own use with published specs, owner reviews and expert tests.
- Prices and ratings checked on 9 November 2026; Amazon ratings may include other countries.
- Electricity costs use Ofgem’s 26.32p per kWh Direct Debit average for 1 October to 31 December 2026.
- Cleaning times per square metre are makers’ figures for their fastest mode.
- No brand supplied a product, paid for inclusion or saw this guide before publication.
How clean and streak-free the glass looked in expert reviews and owner reports, the main reason anyone buys a window robot.
How close it gets to the frame and into the corners, since round pads and wide bodies leave a dirty border you then wipe by hand.
Suction, safety rope, backup battery and owner reports of falls, because a robot dropping off an outside window can damage itself or something below.
Time per square metre, set-up, moving between panes and whether it needs a socket, which decide whether it really saves you effort.
Owner reports of faults, getting stuck and failures after a few weeks, weighed against how many people have reviewed it.
What we did not score
We did not score app features, voice prompts, bundled cleaning fluid or accidental damage insurance offers, and we did not take the manufacturers' suction figures at face value, since brands measure them differently.
Keep the squeegee: when a robot is the wrong tool
A window robot is a maintenance tool for large, flat panes. On small or divided windows it spends more time turning than cleaning, and it cannot climb over handles, stays or sash fittings. For a typical house with a few ordinary windows, a window vac and a squeegee will be quicker: Wired’s reviewer found he could clean windows faster by hand, and still had to check on the robot every five to ten minutes.
Robots also struggle with neglected glass. They spray very little fluid, so bird droppings, stickers and months of grime need a manual clean first; owners and reviewers agree that a robot keeps clean glass clean rather than rescuing dirty windows. Avoid running one in the rain, in strong sun or on condensation, which causes streaks and weakens its grip.
Think carefully about upstairs exterior windows. Trusted Reviews found no safe and practical way to place the W2S Omni on most first-floor outside panes, and Wired’s reviewer had to lean out of a window to free a robot stuck at the top of a pane. If high outside glass is the problem, a window cleaner may be the better spend.
Why pay £399 when a window vac costs £30?
A window vac and squeegee will clean an ordinary pane faster and more cheaply, and leave cleaner corners. What the £399 buys is reach and hands-off time on big glass. The W2S Omni climbs floor-to-ceiling panes and patio doors you cannot easily reach, covers 50 to 55 m² per tank in fast mode, and runs for up to 110 minutes away from a socket; Ecovacs quotes about 65 m² of glass per charge in fast mode.
It also buys safety engineering. It has 8,000 Pa of suction, a 5.2 kg station that acts as an anchor, a cable Ecovacs rates to 100 kg, and power-cut protection that holds it on the glass for 30 minutes. Unbranded robots on Amazon UK start at under £90 but carry lower ratings, and the Hobot S7 Pro at £329 shows that a high price is no guarantee, with only 3.0 stars from owners.
If most of your windows are ordinary sizes, saving the money is the better choice. The Ecovacs mini 2 at £199 is a sensible middle ground for smaller panes, mirrors and shower screens, though it must stay plugged in.
What to expect in the first month
Owners and reviewers describe a similar learning curve with the W2S Omni. Expect the first few sessions to take longer than the spec sheet suggests.
- First use
Charge the station and tie off the rope
Charge the station fully first, which Ecovacs says takes up to three hours. The station’s weight is the main anchor, and it also has a separate 1 m safety rope; clip it to something solid indoors before cleaning outside glass. Reviewers describe the first few times letting go of the robot as nerve-racking, but its suction is strong and it announces when it is attached.
- First windows
Expect to change pads often
Wired’s reviewer was prompted to change the pad and refill the solution after cleaning one large window and a door on both sides. Owners say the pads need cleaning or changing after every window, so buy spares before you start a whole house.
- Weeks 1–2
Learn which windows suit it
Owners report the best results on large, flat panes and patio doors, and streaks when the sun is on the glass. Expect it to give up on handles, sash fittings or panes smaller than about 30 x 40 cm. Very dirty glass may need a second pass or a manual clean first.
- Month 1
Settle into a routine
Most owners use it every few weeks for maintenance rather than deep cleaning. The 230 ml bottle of solution in the box will not last long; Wired’s reviewer estimated about three whole-house washes. A 1-litre refill costs £17.99 at Ecovacs UK.
Before you buy
Always tie off the safety rope
Every robot here comes with one. Tie it to something solid indoors, even on ground-floor windows; reviewers and owners report robots dropping off without warning.
Use a clean pad for every window or two
A dirty pad smears grime around the glass. Owners and reviewers say streaks fall sharply once you swap pads often, so buy spares.
Do not run it on wet glass
Ideal Home notes robots should not be used in the rain or on condensation, as moisture weakens their grip. Dry the glass first or wait for a dry day.
Pre-clean very dirty windows by hand
Robots spray very little water. Give neglected glass one manual clean, then use the robot to keep it that way.
What it really costs to run
Electricity is almost nothing; consumables are the real cost. The W2S Omni’s station holds a 98.55 Wh battery, so a full charge uses about 0.1 kWh, under 3p at Ofgem’s price cap average of 26.32p per kWh for 1 October to 31 December 2026. The figures below assume you clean about 30 m² of glass, inside and out, once a month, using Ecovacs’s solution, which Wired notes the manual tells you to use.
| Item | UK price | How long it lasts | Rough cost a year |
|---|---|---|---|
| Electricity, W2S Omni full charge | 26.32p per kWh | 98.55 Wh per charge, up to 110 minutes | About 31p (12 charges) |
| Ecovacs Winbot cleaning solution, 1 litre | £17.99 | About 12 fills of the 80 ml tank, each covering up to 50 to 55 m² in fast mode | About £10 to £20 |
| Ecovacs wiping pads for W2S Pro Omni, pack of 2 | £16 | Washable and reusable; replace when worn | £16 to £32 |
| Third-party pads for W2S / W2S Omni, pack of 8 | £15.53 (Amazon UK) | Washable; fit and quality vary by seller | About £16 |
| Kärcher RCW 2, in the box | Included | 3 pairs of microfibre cloths and 125 ml of RM 503 cleaner | Refills extra |
In total, expect to spend roughly £25 to £50 a year on consumables for the W2S Omni, depending on how often you buy new pads rather than wash them. That is small next to the purchase price, but it is a cost a squeegee does not have.
The case against window robots
The sharpest criticism of our pick comes from Wired’s Simon Hill, who used the W2S Omni on a Victorian house. On a large modern window it did a decent job, apart from residue in the corners and some smearing, and he rated its design and cleaning above a cheaper rival. On sash windows it stuck on the opening fittings, left dirty stripes down the edges and damaged the paintwork on a glazing bar, and on an upstairs bay it got stuck at the top of the pane, out of reach.
His wider point is about the whole category: by the time you have set a robot up, you could have cleaned the window yourself, and you still have to keep checking on it. Trusted Reviews reached a milder version of the same view, praising the cleaning but finding it saved no time because the reviewer felt she had to watch it. We think that is fair. The W2S Omni wins here because, if a robot suits your windows, it is the best-equipped one; if your home has small or traditional windows, the honest advice is not to buy one at all.
“I just don’t think a robot for cleaning windows is worthwhile for most homes.”
Questions people ask
Are window cleaning robots worth it?
For large panes, patio doors, conservatories or hard-to-reach glass, many owners think so. For a few small windows you can reach, a window vac at around £30 to £70 is quicker and cheaper; Wired's reviewer concluded most homes would be better off without a robot.
Can a window robot clean the outside of my windows?
Yes, all five here work on either side of the glass. You place the robot on the outside pane with the safety rope tied off indoors. The Ecovacs W2S models are easiest because they do not need a socket nearby.
Do window robots clean right into the corners?
Not completely. Square robots with corner brushes, such as the Ecovacs models, get closest; round-pad robots like the Kärcher RCW 2 leave the corners for you to wipe.
Our verdict
If your windows are small, divided or traditional sashes, do not buy a window robot; a window vac and squeegee will do a better job. If you want a robot for smaller panes, mirrors and shower screens, or have about £200 to spend, buy the Ecovacs mini 2. If you have a lot of large glass and want the fastest robot with the biggest tank, the W2S Pro Omni is worth the extra £80. Skip the Hobot S7 Pro, which owners rate poorly, and accept that the Kärcher RCW 2 leaves the corners to you.
For homes with large panes, patio doors or windows away from a socket, the Ecovacs Winbot W2S Omni at £399 is the one to buy. Its battery station, edge scrubbers and safety system make it the easiest robot here to live with, as long as you tie off the rope and keep spare pads to hand.
A window robot only earns its keep on big, flat glass, and on that glass the W2S Omni is the one to have.
Ecovacs Winbot W2S Omni: the best-rated window robot, and the easiest to use away from a socket
- ✓Battery station runs it for up to 110 minutes with no socket nearby
- ✓TruEdge scrubbers lower at the frame; CHIP found edges cleaned to within 2 mm
- ✓About 1 min 45 s per square metre in fast mode, says Ecovacs
- ✓80 ml tank covers up to 50 to 55 m² per fill
- ✓8,000 Pa suction, 5.2 kg anchoring station and 30-minute power-cut protection
- ✓Station winds the combined power and safety cable away automatically
- ✓£399 at Ecovacs UK, down from £529
On a budget? The Ecovacs Winbot mini 2 at £199.00 is our best-value pick.
Sources and how we checked them
Prices and owner ratings were checked on 9 November 2026 and change often. Amazon ratings may include reviews from other countries. Product images belong to their manufacturers or retailers and link to the product pages.
- Ecovacs UK: Winbot range and prices: Current prices for all three Ecovacs models and bundles
- Ecovacs UK: Winbot W2S Omni: Price (£399, was £529), 110-minute battery, 98.55 Wh capacity, 96 W rated power, 80 ml tank, 30 x 40 cm minimum pane, 5.2 kg station, 30-minute power-off protection
- Ecovacs UK: Winbot W2S Pro Omni: Price (£479), 120 ml tank, TruEdge 2.0 and cleaning time per square metre
- Ecovacs UK: Winbot mini 2: Price (£199, was £259), size, weight, minimum pane size and light-dirt guidance
- Amazon UK: Ecovacs Winbot search results and ratings: Owner ratings for the W2S Omni and W2S Pro Omni listings
- Amazon UK: Ecovacs Winbot mini 2: Owner rating for the mini 2
- Kärcher UK: RCW 2: Price, features and specifications
- Very: Kärcher RCW 2: Owner rating of 4.1 from 26 reviews
- Castorama: Kärcher RCW 2 owner reviews: Owner reports of missed corners and circular marks
- Amazon UK: Hobot S7 Pro: 3.0-star owner rating, share of one-star reviews and streaking complaints
- Solenco: Hobot S7 Pro: Price (£329) and specifications
- TechRadar: Hobot S7 Pro review: Streaks and track marks on dirty glass, remote and voice prompts, and a fall from the window
- TechRadar: Ecovacs Winbot W2 Pro Omni review: Five-star verdict on the W2S Pro Omni’s predecessor and its corner limits
- TechRadar: are robot window cleaners any good?: Robots are for maintenance, not neglected glass; safety-tether warning
- Which?: best robot window cleaners: Popular UK models and the warning that round pads miss corners
- Wired: Ecovacs Winbot W2S Omni: Sash-window problems, 68 dB reading, pad and solution use, and the second-opinion quote
- CHIP: Ecovacs W2S Omni test: Edges cleaned to within 2 mm, quietest in its test group, dried stains needing extra passes
- Ideal Home: are robot window cleaners worth it?: Advice not to use robots in rain or on condensation
- Trusted Reviews: Ecovacs Winbot W2S Omni review: Verdict quote, 68 dB reading, and findings on small windows, first-floor exteriors and time saved
- Amazon UK: Ecovacs Winbot W2S Omni listing: Owner review quotes and the summary of streaking and pad complaints (global ratings)
- Ecovacs UK: wiping pads for W2S Pro Omni / W2S Pro: Pad price (£16 for two)
- Ecovacs UK: accessories: Winbot cleaning solution price (£17.99 for 1 litre)
- Amazon UK: third-party W2S / W2S Omni pads, pack of 8: Price of compatible replacement pads (£15.53 for eight)
- Kärcher: RCW 2 technical data: 70 ml tank covering about 50 m², 35 x 35 cm minimum window, 62 dB sound pressure, 40-minute emergency battery and items in the box
- Ofgem: energy price cap, 1 October to 31 December 2026: Electricity unit rate of 26.32p per kWh used for charging costs
Prices, star ratings and review counts were checked on the retailer and brand pages listed below on 9 November 2026. Amazon UK listings for window robots often pool ratings from several countries and from related models, so we treat their headline scores with caution and give more weight to recurring problems in the written reviews. Specifications come from the makers’ product pages and data sheets.
Expert evidence came from published reviews at Trusted Reviews, TechRadar, Wired, CHIP and Ideal Home, and from Which?’s guide to robot window cleaners. Electricity costs use Ofgem’s price cap figures for 1 October to 31 December 2026.
No manufacturer or retailer supplied a product, paid for inclusion or reviewed this guide before publication.
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