On 1 November 2026, the Xiaomi UK purchase pages showed the black X20 Max at £339.99 and the white X20 Pro at £379.99. For those two selected offers, the Max was £40 cheaper. The Pro’s main documented counterpoint is its longer rated runtime, which is Xiaomi’s figure and not an independent result.
Bot ‘n’ Brush has not tested either robot. This comparison draws on Xiaomi’s UK product pages for the X20 Pro and the X20 Max, Xiaomi’s support FAQs (the UK Pro FAQ and the global Max FAQ) and two independent reviews of the X20 Max, from Vacuum Wars and TechRadar. No independent Pro review was found in our focused search, so what we can say about the Pro rests on Xiaomi’s own documentation.
The prices we recorded
The prices below are the displayed prices on Xiaomi’s UK purchase pages for the colours shown. They are selected offers, not a market survey, and not necessarily the cheapest available. The colours differ, so the £40 gap should not be read as an effect of colour.
| Offer detail | X20 Pro | X20 Max |
|---|---|---|
| Colour selected | White | Black |
| Displayed price | £379.99 | £339.99 |
| Purchase control shown | “Add to cart” | “Add to cart” |
| Recorded | 1 November 2026, about 17:48 GMT | Same |
Both pages advertised free delivery for orders over £59, with most orders arriving in two to three business days. That is advertised wording, not a promise checked against a postcode. We did not verify checkout, delivered totals or voucher conditions. Mi Points information also appeared, but points are not an immediate discount.
Prices move, so check the live pages before you buy: Pro and Max.
What Xiaomi documents
According to Xiaomi’s UK pages for the Pro and the Max, both robots come with a dock that washes the mop pads, dries them with hot air and collects dust. Both pages describe laser navigation, a carpet sensor that lifts the mop pads, app control and voice assistant support. The differences below are manufacturer claims, not test results.
| Feature | Pro (Xiaomi claim) | Max (Xiaomi claim) | What it does and doesn’t establish |
|---|---|---|---|
| Advertised suction | Up to 7000 Pa | Up to 8000 Pa | A specification. It does not show better pickup. |
| Rated runtime | Up to 160 minutes | Up to 120 minutes | Each figure is stated for a fully charged robot set to vacuuming and mopping in Standard mode, with data from Xiaomi Internal Labs. Not independently demonstrated endurance, and the product-page footnotes give no further shared test details. |
| Extendable mop arm | Not stated on the Pro page | Documented | The Pro page’s silence does not prove the Pro lacks one. |
| Pad-wash water | No heated-wash claim on the Pro page | About 55°C at the outlet on the Hot setting | A Xiaomi test condition at the outlet, not a pad temperature. |
| Brush | Not stated | Ordinary brush installed; hair-cutting brush in the accessory package | Attributed to Xiaomi’s UK page. Selected-package contents were not independently inspected. |
Edge reach and heated pad washing
Xiaomi’s UK Max page documents an extendable mop arm with approximately 40 mm of horizontal extension. In Xiaomi’s straight-line test along a dusted wall, with Vacuuming and Mopping mode selected and Mop Swing enabled, the minimum distance of remaining dust from the edge after mopping was 2 mm or less. We found no independent test confirming that result, so it should not be treated as guaranteed cleaning performance along your own skirting boards.
The same page describes pad washing with water of about 55°C at the outlet, on the Hot setting. That is a measurement at the outlet under Xiaomi’s stated conditions. It does not tell you the temperature of the pad, and we are not drawing any hygiene or sanitising conclusion. The Pro page makes no heated-wash claim. That is not proof the Pro lacks one, so check the Pro’s specifications if this matters to you.
The Xiaomi UK Max page also says an ordinary brush is installed and an automatic hair-cutting brush comes in the accessory package, and the global Max FAQ lists that accessory too. We cannot confirm what the selected package contains.
Carpet setup and rug limits
Both Xiaomi UK product pages describe automatic mop lifting of up to 10 mm. Both also suggest selecting “Carpet avoidance” in the Xiaomi Home app if carpet is thicker than 8 mm, or shaggy and fringed (see the Pro and Max pages).
The FAQs also specify an important setup step. Carpet areas must be set in the app for the mop lift to apply, otherwise the robot will not lift the mop on carpet. Xiaomi also advises setting restricted areas before mopping, including for tassel carpets (see the UK Pro FAQ and the global Max FAQ). A lift height is not a guarantee that a rug stays dry, so treat configuration as part of owning either robot.
What independent testing shows (Max only)
Independent evidence covers the Max. Vacuum Wars bought its own unit and compared results against its database of tested robots. It reported 91% of sand removed on medium-pile carpet against a site average of 75.4%, and pet-hair removal of 81.5% on flattened carpet against a site average of 81%. These are results against Vacuum Wars’s baseline. They are not a Pro-versus-Max comparison.
Mopping needs a distinction first. Removing a dried-on stain and leaving a floor drier are different outcomes. A robot can scrub a stain well and still leave more water on the floor. Vacuum Wars scored the Max’s dried-on stain removal at 159 against a site average of 93, but it left 3.5 g of water behind against a 1.01 g average, and the overall mopping score was 2.44 against 2.73. The same review reported that 60% of 7-inch hairs wrapped on the brush, against a 38% average. The page does not identify which brush was tested, so we cannot say how the hair-cutting brush would behave.
TechRadar reviewed a sample unit over a year of weekly use in a hallway and two large rooms; the site discloses affiliate commissions. The reviewer found oats, cereal crumbs and flour mostly collected, with a few left in hard corners. Ketchup smeared at first and needed several dock visits and a few runs to clear, leaving some residue in the grout. The reviewer called the mapping accurate and said the dock was found every time. This is qualitative testing of one unit, not a controlled test, and it does not cover cables, socks or pet waste.
Obstacles
Both FAQs warn that dark or reflective surfaces, transparent objects, small table and chair legs and low obstacles may not be detected, and that object recognition drops in weak light (UK Pro FAQ; global Max FAQ). Navigation hardware is not a guarantee, so keep floors clear of cables and anything you would not want a robot to drive over. Our navigation explainer covers why.
Runtime and longer runs
Xiaomi rates the Pro at up to 160 minutes and the Max at up to 120 minutes. According to the footnotes on the Pro and Max pages, each figure is for a fully charged robot set to vacuuming and mopping in Standard mode, with data from Xiaomi Internal Labs. The footnotes describe the mode in the same way but give no further shared test details, such as floor type, so matching mode names do not make this a matched comparison. The Pro therefore has the longer manufacturer rating. However, the independent evidence reviewed does not establish whether it runs longer than the Max under matched conditions, or whether it would need fewer recharge pauses in your home.
What the dock does and what stays manual
The Xiaomi FAQs describe the same routine for both robots. The Pro text comes from Xiaomi’s UK FAQ. The Max text comes from Xiaomi’s global FAQ, because we did not find a UK Max version.
- You prepare: fit the mop assembly and fill the clean-water tank.
- The robot does: it dampens the pads before starting and returns to wash them during a run. The frequency can be changed in the app.
- The dock does: at the end of a clean it empties dust, washes the pads and dries them with air.
- You finish: clean the dirty-water tank. Both FAQs recommend doing this after each use. Filters, brushes, pads and the washboard also have care intervals.
Examples of the remaining upkeep include cleaning the filter every two weeks, replacing the mop pad every one to three months, and cutting hair off the main brush with scissors rather than pulling it, as both FAQs describe. For a wider picture of routines, see our robot vacuum maintenance guide and our mopping explainer.
Matching documented routines do not prove identical effort in your home, and we have no measured time savings. The FAQs we read do not describe what happens if clean water runs low or the dirty tank fills mid-run, so we cannot say how much attention either model needs during a run.
Reliability: what the evidence does and doesn’t show
TechRadar’s reviewer reported that the dock’s dirty-water pump sometimes failed to run during pad washing after a long period of use, so dirty water built up and overflowed. Cleaning the water sensors did not fix it. A relative’s unit developed a similar problem and was repaired by Xiaomi, and the reviewer saw some online reports. That is one review sample, one family anecdote and some online comments. It does not tell us how common the fault is, and it is not a model-wide conclusion. Equally, the absence of Pro fault reports in our research does not show that the Pro is more reliable, because no independent Pro review was found in our focused search.
Who might consider which
- The Max may suit households that value the documented mop-arm and heated pad-wash features, or that want to weigh the lower captured price. The independent carpet results we found (Vacuum Wars) also cover the Max, though with a below-average mopping score and a water-left-behind result to weigh.
- The Pro may suit households that prioritise Xiaomi’s longer rated runtime. Our focused search found no independent Pro review, so that remains a manufacturer-rated advantage rather than a demonstrated real-home endurance advantage.
- Either way, configure carpet areas in the app, keep the floor clear, and clean the dirty-water tank after each use.
Conclusion
At the prices recorded on 1 November 2026, the Max had the lower price and the documented mop-arm and heated-wash features. The Pro had the longer manufacturer-rated runtime. Neither point amounts to a matched independent comparison, because the independent evidence we reviewed covers the Max only. The price relationship may change, so recheck both Xiaomi UK offers before deciding. A smaller or larger gap could shift the balance.