For most UK homes in 2026 the best window cleaning robot is the HOBOT S7 Pro: it grips hard at 4800Pa, sprays its own water, and handles framed, frameless and outdoor glass for around £329. The honest caveat first. A robot suits big flat panes and hard-to-reach glass, not small Georgian sashes or a quick wipe of the kitchen window.
We clean windows for a living, so this guide is written the way we would brief a customer who rang up asking whether to buy one of these instead of booking us. Below are the models actually on sale in the UK right now, what each is good and bad at, and where a cloth and a squeegee still beat the machine.
How the window cleaning robots compare
| Model | Best for | Glass types | Safety system | Cleaning method | Approx UK price |
|---|---|---|---|---|---|
| HOBOT S7 Pro | Best overall, indoor + outdoor | Framed, frameless, narrow-frame, any thickness | UPS 20 min, 4.5m rope rated 230kgf, edge sensors | Dual ultrasonic spray + twin mops | £329 |
| Ecovacs WINBOT W2S Omni | Large or frameless panes, most hands-off | Framed, frameless, floor-to-ceiling, tilting | 12-stage protection, 100kg cable + 1m rope, 30 min on power loss | Auto spray from station, triple nozzle + mop | £449 |
| Ecovacs WINBOT mini 2 | Small homes, tight budget, easy storage | Framed, frameless, floor-to-ceiling, tilting | 5 hardware layers, 8000Pa hold, safety cord | Ultrasonic spray + edge brushes | £217 |
| HOBOT-2S | Reliable mid-range workhorse | All thicknesses, framed and frameless | UPS 20 min, 4.5m rope rated 200kg, edge sensors | Dual ultrasonic spray + twin mops | £300–£349 |
| HOBOT-R3 | Budget pick for framed windows and mirrors | Framed glass, mirrors, shower screens | UPS 20 min, 4.5m rope rated 200kg, safety tether | Dual ultrasonic spray + microfibre pads | £280–£329 |
Prices were checked in May 2026 at the Ecovacs UK store and Amazon UK and move around with offers, so treat them as a guide rather than a fixed figure.
HOBOT S7 Pro
The best results a consumer window robot gives, indoors or out.
| Suction | 4800Pa, with a widened sealing ring |
|---|---|
| Spray | Dual ultrasonic nozzles, 15-micron mist |
| Mops | Two pads, 600 wipes a minute, 4mm stroke |
| Safety | UPS holds 20 min on power loss; 4.5m rope rated 230kgf |
| Speed | About 2.6 min per square metre; 1.7kg |
| Glass | Framed, frameless, narrow-frame, any thickness, indoor and outdoor |
Reasons to buy
- Fine 15-micron mist, so no runny dribbles
- Edge sensors find the rim of frameless glass
- Rated for indoor and outdoor use
- Tidier corners than most rivals
Reasons to avoid
- Can finish a little streaky on dirty outdoor glass
- Corded, so a faff on a tall window
- Not cheap for something you still lift pane to pane
The S7 Pro is HOBOT’s current flagship and the one we would point most people towards. It sticks to the glass by suction, drives itself in a zigzag, and wipes with two oscillating mop pads while a pair of ultrasonic nozzles mist the surface in front of them.
TechRadar and Trusted Reviews both rated it, and the verdict matches ours: on lightly soiled indoor glass it leaves panes perfectly clear. On dirtier outdoor glass it can finish a little streaky, and TechRadar found it generally slower than cleaning by hand. Best for anyone with a lot of large, awkward or first-floor-interior glass who does not mind babysitting it.
Ecovacs WINBOT W2S Omni
The most hands-off robot here, thanks to its water station.
| Suction | Up to 8000Pa peak, around 3000Pa while moving |
|---|---|
| Spray | Triple wide-angle nozzles fed from the station |
| Navigation | WIN-SLAM 4.0 with TruEdge edge handling |
| Safety | 12-stage protection, 100kg cable, 1m backup rope, 30+ min on power loss |
| Run time | About 110 minutes; noise around 68dB |
| Glass | Framed, frameless, floor-to-ceiling and tilting, down to 30x40cm |
Reasons to buy
- Cordless run, no cable across the glass
- Station holds the solution, so no per-pane refills
- 30-minute power-loss hold, the longest here
- Handles big floor-to-ceiling areas with ease
Reasons to avoid
- The dock makes it bulkier to store
- Priciest robot you can buy in Britain today
- Can leave faint marks right in the corners
The W2S Omni is the flagship on the Ecovacs UK store, and its trick is the station. The robot lives on a portable dock that holds the cleaning solution and powers a cordless run, so you fill the station, not the robot, and there is no trailing cable while it cleans.
This is the most hands-off robot here. You are not topping up a thimble of water every pane, and the cordless run makes big glazed areas far less fiddly than a corded unit. Best for larger homes, conservatories and flats with floor-to-ceiling windows, where the cordless run and the bigger water supply earn their keep.
Ecovacs WINBOT mini 2
The cheapest WINBOT, slim enough to keep in a drawer.
| Suction | 8000Pa, the same hold figure as the dearer W2S |
|---|---|
| Cleaning | Ultrasonic spray, corner brushes on all four sides to within 1mm |
| Navigation | WIN-SLAM 4.0, measures the window and plans the path |
| Safety | 5 hardware fall-protection layers plus a safety cord; corded in use |
| Size | 215 x 215 x 55mm, about 5.5cm thick |
| Glass | Framed, frameless, floor-to-ceiling and tilting |
Reasons to buy
- Cheapest robot Ecovacs sells in the UK
- Edge brushes wipe to within about 1mm of the frame
- 8000Pa hold inspires confidence
- Slim enough to tuck into a drawer
Reasons to avoid
- Corded, so the tether-and-trip caveats apply
- Small water tank means more refills on a big job
If the bigger machines feel like overkill, the mini 2 is the sensible entry point, and it is the firm’s slimmest WINBOT at roughly 21cm a side. It tucks into a drawer rather than needing a shelf.
For the money it punches well above its size. The edge brushes get nearer the frame than you would expect from a budget unit, and the 8000Pa hold inspires confidence. Best for smaller flats, renters short on storage, and anyone who wants to try a window robot without spending £400-plus.
HOBOT-2S
A proven, widely stocked workhorse, often cheaper than the flagship.
| Spray | Two ultrasonic nozzles, 15-micron mist, twin 26ml tanks |
|---|---|
| Holding force | Around 7kg ascending power |
| Safety | UPS holds 20 min with audio alert; 4.5m rope rated 200kg |
| Speed | About 2.4 min per square metre at 12cm a second |
| Glass | All thicknesses, framed and frameless; about 1.3kg |
Reasons to buy
- Proven design, widely stocked in Britain
- Dual spray means less re-wetting of pads
- Often found cheaper than the newer S7 Pro
Reasons to avoid
- A touch dated next to the S7 Pro
- The app is basic
- Corded
The 2S has been on sale for a few years and is still one of the most widely stocked window robots in Britain. It set the template the S7 Pro refined: dual ultrasonic spray, twin mop pads, and an edge-leakage sensor that reads the air seal at the glass rim.
It does the core job well and the dual spray means you are not constantly re-wetting pads. Best for buyers who want a known quantity at a sensible price and do not need the latest sealing-ring tweaks. Prices tend to sit in the £300 to £349 band.
HOBOT-R3
Honest about its limits: framed windows, mirrors and shower screens.
| Spray | Dual ultrasonic spray, 15-micron mist, microfibre pads |
|---|---|
| Safety | UPS holds 20 min on power loss; 4.5m rope rated 200kg |
| Control | App and remote |
| Best surfaces | Framed glass, mirrors, glazed tiles and shower screens |
| Minimum pane | About 35 x 35cm |
Reasons to buy
- Good value within its framed-glass brief
- Strong on mirrors and shower screens
- Same UPS-and-rope safety as the rest of the HOBOT line
Reasons to avoid
- Frameless picture windows are not its strength
- Street price now sits above the old budget band
The R3 is HOBOT’s affordable model and it is honest about its limits. It is sold for framed windows, mirrors and shower screens rather than as an all-rounder, and that is the right way to think about it.
Within that brief it is good value, and a large bathroom mirror or a shower screen is exactly the kind of flat, framed surface these robots handle best. Push it onto big frameless picture windows and you are asking more than the price suggests. Best as a first robot for someone with ordinary framed windows, mirrors and glass doors who wants to spend the least.
What about the Ecovacs WINBOT W3 Omni?
Ecovacs launched the WINBOT W3 Omni on 5 March 2026 as its new global flagship, and on paper it is a real step up. A Vortex Wash system rinses the mop pads itself, WIN-SLAM 5.0 navigation adds 1mm obstacle avoidance, peak suction climbs to 10000Pa, and the run stretches to 130 minutes.
The catch for British buyers is supply. When we checked in May 2026 it was selling in the US at $699.99 but was not yet listed on the Ecovacs UK store, where the W2S Omni remains the flagship. A few importers list it near £720.
If you want the newest thing and do not mind paying import money, watch for a proper UK launch. If you want value now, the W2S Omni is the sensible buy.
How to choose a window cleaning robot
Six things decide whether a robot suits your windows. Run through them before you spend.
Safety system
This matters most the moment you clean anything above the ground floor. Look for two independent protections: a backup power supply that keeps the robot stuck if the mains cuts out (HOBOT quotes 20 minutes, Ecovacs over 30), and a physical safety rope you clip to something solid.
The HOBOT ropes are rated to 200 to 230kg; the Ecovacs cable is rated to 100kg with a backup cord. Use the rope every time on an upstairs window. The suction relies on a seal, and a flat battery with no UPS means a falling robot.
Glass type and frame
Framed glass is the easy case. Frameless panes, where there is no lip to tell the robot where the edge is, need a model with proper edge sensors, so check for that explicitly if your windows are frameless or have very slim frames. The HOBOT line and the Ecovacs WINBOT models all handle frameless; cheaper or older units often do not.
Pane size
These machines pay off on big glass. Most need a minimum pane of about 30x40cm just to fit and seal, so they are no use on small leaded or Georgian-bar windows divided into little squares. The bigger and flatter the pane, the better the robot looks next to a human.
Indoor only or indoor and outdoor
Plenty of robots are sold for interior glass. If you want to do the outside of your windows, check the spec says outdoor, and think hard about anything above the first floor. The S7 Pro is rated indoor and outdoor; a tethered run on a ground-floor exterior is reasonable, a second-floor exterior is a job for a pole-fed pro.
Cleaning method
Dry-pad robots smear dust around. You want a sprayer. Ultrasonic misting (HOBOT) and the multi-nozzle atomised spray (Ecovacs) both wet the glass evenly so the pads actually clean rather than buff dirt. A model that sprays itself also saves you pre-wetting every pane by hand.
Noise and price
These run at roughly 63 to 68dB, about as loud as a normal vacuum, so they are not silent background helpers. On price, the UK market in 2026 runs from about £200 for a compact unit to £450 for the cordless Ecovacs flagship, with imported next-gen models pushing past £700. Set the budget against how much glass you actually have.
Do window cleaning robots actually work? An honest take
Yes, with a clear limit. We clean windows professionally, and we are not worried about the robots taking the work, because the jobs they do well and the jobs people call us for barely overlap.
Where they shine
A big, flat, lightly soiled pane, the kind you get on a modern extension, a balcony door or a floor-to-ceiling window, is exactly what these machines are built for. They are also good on glass a person struggles to reach safely, such as a pane behind a fixed railing or above a stairwell, where the alternative is a ladder you would rather not climb. Set up well, on the right glass, a good robot leaves a result most people are happy with.
Where they fall short
Every independent reviewer, and our own experience, lands in the same place: robots struggle at corners and edges. They drive in straight lines, so the last few millimetres into a corner often get a light pass or none, and on a dirty window that shows. They cannot touch the frames, the sills or the rubber seals, which is half of what makes a window look properly cleaned.
Textured, curved or stained glass throws them. And they are slow. A robot that takes over two minutes a square metre, plus the time you spend lifting it pane to pane and topping up water, is not beating a cleaner with a squeegee on a normal round.
When to pick up a cloth instead
Reach for a cloth, or call us, for small divided windows, for anything where the frames and sills need doing too, for that first heavy clean after the builders leave, and for exterior glass above the ground floor where safety and reach matter more than novelty. A robot is a good tool for keeping large, accessible glass topped up between proper cleans. It is not a replacement for a thorough job on a Victorian terrace.
Our practical advice: buy a robot if you have a lot of big glass and hate doing it, set realistic expectations on corners, and keep a microfibre cloth handy for the edges it misses. Treat it as a helper, not a magic wand.
Frequently asked questions
Are window cleaning robots worth it?
They are worth it if you have a lot of large, flat, hard-to-reach glass and you dislike cleaning it yourself. On big modern windows a good robot gives a result most people accept. They are poor value for small divided windows, for frames and sills, and as a full replacement for a professional clean, because they miss edges and corners.
Can window cleaning robots clean exterior windows?
Some can. Models rated for outdoor use, such as the HOBOT S7 Pro, will clean exterior glass, but you must clip on the safety rope and ideally stay nearby. On the ground floor this is reasonable. For first-floor and higher exterior windows, reach and safety make a pole-fed professional the better and safer choice.
Do window cleaning robots leave streaks?
Good spraying models leave little to no streaking on lightly soiled glass, which is why ultrasonic or multi-nozzle sprayers beat dry-pad units. On dirtier outdoor glass even strong robots can finish slightly streaky, and corners often need a wipe by hand afterwards. A clean pad and the right cleaning solution make the biggest difference to the finish.
Are window cleaning robots safe, or will they fall off?
Quality robots hold by strong suction and add two safeguards: a backup power supply that keeps them stuck for 20 to 30 minutes if the mains fails, and a safety rope rated to 100kg or more that you anchor to something solid. Used with the rope clipped on, a fall is unlikely. Skip the rope on an upstairs window and you are gambling.
Do window cleaning robots work on frameless glass?
The better ones do. Frameless panes have no lip to mark the edge, so the robot needs proper edge sensors to detect where the glass stops. The HOBOT S7 Pro and 2S and the Ecovacs WINBOT W2S Omni and mini 2 all handle frameless glass. Cheaper or older robots can slide off a frameless edge, so check the spec first.
How much does a window cleaning robot cost in the UK?
In 2026 UK prices run from roughly £200 for a compact model like the Ecovacs WINBOT mini 2, through £300 to £350 for HOBOT mid-range units, to £449 for the cordless Ecovacs W2S Omni. Newer imported flagships such as the WINBOT W3 Omni can exceed £700. Prices shift often with retailer offers.
Do you still need to pre-wet the glass?
With a self-spraying robot, usually not. HOBOT and Ecovacs models carry water or solution on board and mist the glass as they go, so you fill the tank or station and let it work. Budget or older units without a spray often need you to dampen the pad or the glass first, which adds a minute or two per pane.
Can a window cleaning robot replace a professional window cleaner?
Not fully. A robot keeps large, accessible glass topped up between cleans, but it cannot do frames, sills or seals, struggles at corners and edges, and is unsafe or impractical on high exterior windows. For a thorough clean, period properties, or anything above the ground floor outside, a professional still does a noticeably better and safer job.
Last updated: May 2026. Written by the team at Monster Cleaning, professional domestic and window cleaners working across London, Liverpool and Manchester since 2014. If a robot isn’t the answer, our London window cleaning service covers everything from Victorian sashes to floor-to-ceiling glazing, and you can see our full house cleaning options or get a quote on the Monster Cleaning home page.