iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop

Tracked UK prices for the Roomba Combo j9+ currently run £363.70 to £465, and prices and stock vary by retailer — check current price and stock before buying. It sits in the premium tier of iRobot's range, reflecting features like the self-emptying Clean Base dock, automatic water-tank refill, and Dirt Detective's area-based cleaning adjustments. It carries a 2-year limited warranty. Comparing iRobot's direct listing against other UK retailers before buying is worthwhile.

That depends on your home. The Roomba Combo j9+ suits multi-surface homes with carpet, hard floor and tile wanting combined vacuuming and mopping with minimal hands-on emptying, thanks to the self-emptying Clean Base dock and automatic 30-day water-tank refill. Its small 0.313L onboard bin, undisclosed suction rating, and premium price are worth weighing against simpler robot vacuums or separate vacuum-and-mop setups. D.R.I. carpet protection, which lifts the mop pad off rugs automatically, adds genuine value for mixed-flooring homes rather than all-hard-floor or all-carpet ones. At 4.07kg and a typical 348 x 348 x 87mm footprint, it fits most homes physically; the bigger question is whether the 2-year warranty and dock convenience justify the cost versus cheaper alternatives.

No. The Roomba Combo j9+ is not a bagless system — the Clean Base dock empties the robot's small 0.313L onboard bin into a disposable dirt bag, which can hold debris for up to 60 days before it needs replacing. This bagged approach is part of why the dock is central to the machine's price, since it removes the need to manually empty the tiny onboard bin after every run, which would otherwise be impractical given its size. The same dock also automatically tops up the robot's water tank, good for around 30 days between manual refills. Buyers wanting a fully bagless robot vacuum should look elsewhere, as replacement bags are an ongoing consumable cost with this model.

iRobot states a maximum runtime of up to 175 minutes for the Roomba Combo j9+. User reports for combined vacuum-and-mop cleaning suggest actual runtime is often lower, roughly 60–75 minutes, depending on home size and mode. That gap matters because SmartScrub mopping and Dirt Detective's extra passes on dirtier areas both draw more power than simple vacuuming, so mixed-surface cleaning is likely to sit toward the lower end of that range. The self-emptying Clean Base dock and auto water-tank refill mean the robot can complete a full cleaning cycle and recharge without manual intervention, but coverage per charge will still depend heavily on home size, surface mix, and which of the three suction levels is selected.