• The iRobot Roomba Duo is a robot vacuum concept
• One chunky, powerful mopping and vacuuming robot...
• ... with a regular, small robovac docked in its hat, for detail work

When it comes to robot vacuums, size matters. Robovac makers need their bots to be powerful, but also small enough to get into tight spots. The two things are often incompatible.

iRobot has come up with an imaginative solution. The iRobot Roomba Duo is a two-in-one bot in the truest sense. In its full form, it's a big, chunky floor cleaner, with a bulky body is large enough to contain everything you need for serious cleaning oomph. Then, in the upper part hides a regular robot vacuum that's compact enough to take care of detail work.

I spoke to Adam Pope, Chief Engineer & Vice President of Product Planning & Development at iRobot, to get some more insight into the unusual creation.

"The large base robot is really for heavy-duty cleaning," he tells me. "It's big enough to be able to have lots of water inside, and it can also have stronger vacuum. It's designed for heavy-duty cleaning and more open spaces and high-traffic areas in your home. You get that heavy-duty clean that you might use a stick vac or a wet-dry vac on today."

He explains that on top of all that, the base also deploys the companion bot — which is similar to the Roomba Plus 575 robot. That smaller robovac will clean under furniture, around chair legs, in corners and essentially "all those other spaces that the larger robot can't get to".

"They work together," he adds. "They each have their own job, and they kind of split the job up and go do those activities."

I saw a demo of the iRobot Roomba Duo in action at IFA 2026. The dock was lifted off the top of its cleaner base — like someone taking their hat off — and lowered gently to the ground, where the smaller robot vacuum exited. This then went on to successfully complete an obstacle course that looked far too tight for it to navigate, before returning to its hutch, to be lifted back to its charging home on top of the base bot.

Unfortunately, for those who like the sound of this, the iRobot Duo isn't going on sale quite yet. "It's a cool little innovation concept we're just showing here at IFA to see how the market reacts to it and if there's interest in that type of product," Pope tells me.

I suggest it's quite difficult to stand out in the robot vacuum market these days, given the speed at which brands are releasing new models. "There's a lot of spec war in that category," he responds. "Not as much innovation as we'd like to see. So this was our way of trying to get something different, something new. But it still does the job — the job that customers actually need."

• The Aqua20 Pro Ultra Roller X Complete is Dreame's new flagship robovac
• World's first robovac to use heated steam at 180°C as part of its mop system
• Can also clear double-step thresholds up to an impressive 3.9in / 10cm

When I spoke to a load of major robot vacuum brand execs about where they thought robovacs were heading in the next five-to-10 years, a common theme cropped up: the desire to close the performance gap between manual and robotic floor cleaners. That's not just the vacuuming power, but the mopping prowess too.

And so, at IFA 2026, we have the world's first robot vacuum with steam cleaning powers: the Dreame Aqua20 Pro Ultra Roller X Complete. It's an exciting prospect, but based on the demo I saw, I'm not sure I'd be throwing out my manual steam cleaner any time soon.

The Aqua20 Pro Ultra (I'm not typing the full name each time) vaporizes water into 356°F / 180°C steam, which is pushed out through four outlets along the roller edge. This steam is designed to loosen tough, dried-on stains. The roller then gently scrubs them away, using hot water.

On the demo I saw, the steam function seemed quite gentle — there wasn't enough to be visible on a still photo, although you can see it in the video clip above. My first concern about the system is that there might not be enough steam to really make an impact.

The second is that because the heating happens inside the bot itself, using it has a big impact on battery life. I spoke to Dawn Chen, a Director at Dreame, and he confirmed that with the steam function on, the robot's runtime is around 30 to 40 minutes, compared to around four hours with it off. Steam needs to be switched on and off manually, in the app, and can only be used for a zone that's less than 10 square meters in size. Chen explained that the function is meant for spot-cleaning only; to tackle stubborn and dried on stains.

That runtime is fairly limiting. It makes it difficult to use the steam function as part of a more extensive cleaning session, which is a situation I expect will be common.

Making it work

The process of adding the steam function caused Dreame a few headaches. "During this R&D process, we faced two main problems. The first is about the limescale. Because we are turning the water into steam, this process will produce a lot of limescale," Chen explained. "To solve this problem, we added some limescale remover inside the robot, in the pipeline."

The second — and perhaps bigger — challenge was to do with controlling the temperature inside robot itself. "Because we put this kind of heat inside the robot body, the heat it produces will affect other components, especially the electronic components inside the robot body," Chen told me.

To address the issue, the engineers had to add internal insulation to protect the different components. And that was easier said than done — Dreame had to completely redesign the inside of the robovac to add the steam components, and insulation, while still maintaining the streamlined shape and size.

All the talk of limescale and preventing damage to internal components instills a certain amount of fear in me. I can't help but wonder if iRobot might have had the better approach — that brand's new Roomba Max 875 expels warm mist rather than steam, and the active heating happens in-dock rather than on-bot.

The demo showed a much denser cloud of mist than Dreame's bot was expelling, and because the Rooma bot itself isn't doing any active heating, using the mist function has a minimal impact on battery life. Of course, the really important thing is how effectively each robot cleans, and we won't know that until we've had a chance to test them.

Other upgrades

Back to the Aqua20 Pro. Aside from the headline steam feature, you'll also find an upgraded 'Proleap' system that can now bump the bot over single steps up to 2in / 5cm, or double steps up to 3.9in / 10cm. That's the tallest threshold clearance I've seen from any brand (so far) although in the demo it sometimes took a couple of run-ups to make it over.

Dreame has also added enhanced AI vision with adaptive learning — so the robovac can apparently react to moving objects and re-plan its route, in real time, in response.

The roller can kick out from the side of the robovac by up to 8cm / 3in — much further than its predecessor, the Aqua10 Ultra Roller Complete — to get nice and close to the edges of rooms. To avoid unwanted dampness while all this is going on, the main vacuum roller and side sweeper can both lift (by 5mm and 10mm respectively) while the mopping is happening. The roller can also lift 15mm when the bot is traversing carpet.

The Dreame Aqua20 Pro Ultra Roller X Complete is due to launch on September 21 in Germany, Austria, Spain, Portugal, and Switzerland, followed by a number of other European countries. I don't have a launch date for the UK yet, but Chen promises it'll arrive before the end of the year. Due to FCC regulations, launch in the US is unconfirmed.

• iRobot has unveiled its new flagship Roomba Max 875 Combo
• It sprays out heated mist to dislodge dried dirt from hard floors
• There's a seal around the vacuum to maximize pickup power

iRobot has revealed its latest flagship robot vacuum, and I've just seen it in action at IFA 2026. The Roomba Max 875 Combo is a combination robovac-and-mop, and boasts some intriguing features on both of those floorcare prongs.

One that caught my attention in particular is the mopping setup. Robot vacuum mopping has historically been rather underwhelming, but the latest models are showing some significant improvements. iRobot's Roomba Max 875 Combo's USP is its 'ThermaMist' function. I got the low-down from Adam Pope, Chief Engineer & Vice President of Product Planning & Development at iRobot.

"The ThermaMist is a pretty interesting technology," he tells me. "It's an ultrasonic warm mist, meant to pre-treat stains. So it'll detect stains and pre-treat them before it mops. The customer can also activate it in a certain area if they want to just do that whole area.

"The heat gives you a little better power to break up some of the oily or sugary stains that might be sticky. So that's the reason that we have the heat in there, really, try to help break those up."

Unlike on Dreame's new mist-expelling robovac, which heats the water on the robot itself, here the heating happens in the dock. From an engineering perspective, what's interesting is that the on-bot process of creating ultrasonic mist also naturally generates warmth.

"The dock can put hot water in the robot, but the actual ultrasonic ThermaMist part of that process, it does actually heat the water as it's coming out," explains Pope. "When [the water] goes through that process, it comes out warm, even if there's room temperature water in the robot."

The fact there's no active heater on the robot itself is good news for battery life. "With the ThermaMist on, it's going to have a small impact on the battery life, but not a large one, because the process of heating is part of the ultrasonic component," Pope confirms. "It's not like there's a special heater that you're running all the time."

Unfortunately, iRobot wasn't demoing the ThermaMist feature when I visited the booth. However, based on the video (above) I was sent over later, it looks promising — there's a good amount of mist created, and it's being delivered evenly. In theory it sounds like a truly interesting innovation, and one that has plenty of potential to deliver strong mopping results.

iRobot has also extended the mop, which is larger in diameter and spins faster than its predecessors, for extra scrubbing power. It can kick out to one side to get close to the edges of rooms, and there's a shield that will slide under the roller as extra protection against unwanted sogginess when the bot is moving over carpet.

Sealing the deal

There's interesting innovation on the vacuuming front too. iRobot has added a 'SealForce' system, which is essentially a kind of skirt around the suction inlet on the Max 875 Combo, which lowers to form a loose seal against the carpet fibers.

"The SealForce brings a component of the cleaning head down to the floor, so you get all that airflow going right through the deep fibers of the carpet, trying to pull everything deeply out of the carpet, or even out of crevices, grout lines, that sort of thing," says Pope. "It's really kind of applying the suction where you need it most."

In the demo, the 'SealForce' seal wasn't as dramatic as I had been expecting. You can see the moving frame around the suction inlet below, and in the right-hand photo it's about as extended as it gets. That small shift could be enough to make a big difference to the suction, through — we'll need to test it out to find out.

iRobot is traditionally shy about publishing its suction specs, but here it has done: the Roomba Max 875 Combo offers 35,000Pa, which is right up there with the highest numbers you'll find anywhere. I'm increasingly of the opinion that it doesn't really matter anyway. The suction is only as effective as the wider design you put it into — and if it works as intended, this seal could make a big difference to the Max 875's pickup power.

Saving grace

The past few years have been a rocky time for once-supreme robot vacuum brand iRobot. Its bots have fallen behind the pack when it comes to features, so it's exciting to see the company starting to find its footing again when it comes to innovation.

The iRobot Roomba Max 875 Combo is on sale now in the UK, priced at £1,099. (equivalent to about $1,490 / AU$2,060). iRobot has a presence in Australia, but I don't yet have launch details for the 875 Combo there.

What about the US? Due to the new FCC ban on foreign-made "advanced" robots, the Max 875's launch is on pause for now. iRobot was founded in the US, but at the start of the year it was taken over by Chinese manufacturing company Picea. However, this takeover isn't to blame for the fact the brand can't now sell its new products in the US; the ban refers to where the product is manufactured, and Roomba bots have long been made outside of the US.

In terms of future plans, Pope has this to say: "We're working through with our advisors on how we continue to sell in the US. So we have multiple plans that we're working through and multiple strategies that will come to fruition, and we'll still be able to bring cool technology to the US as well."