The new flagship Roomba has a unique mopping feature for tackling dried-on dirt — and it might be the thing that restores iRobot to its former robovac glory

The Roomba Max 875 will mist stains away

News By Ruth Hamilton Published 9 September 2026

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• 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.

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"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."

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