iRobot Roomba Plus 678 Combo Review: 30,000 Pa Suction and a Dock That Washes the Mop Roller
The Roomba Plus 678 Combo Robot + AutoWash Dock is a midrange iRobot vacuum and mop that pairs 30,000 Pa suction and LiDAR mapping with a dock that empties the bin, dispenses cleaning solution, washes the mop roller and dries it. The mop lifts automatically over carpet, and the robot recharges and resumes on its own. It suits mixed hard-floor and carpet homes that want low-maintenance cleaning, with the caveat that Apple Home, SmartThings and Home Assistant arrive only once the robot completes Matter certification, and that it connects on 2.4 GHz Wi-Fi only.
- Mixed hard floor and carpet homes
- Low-maintenance cleaning
- Pet hair and long hair
- Alexa and Google Home households
Pros
- 30,000 Pa suction with a hair-cutting main brush and an anti-tangle edge-sweeping brush
- AutoWash dock self-empties the bin, dispenses cleaning solution, washes and dries the mop
- Mop lifts automatically over carpet
- LiDAR navigation with obstacle and cliff detection, multi-room mapping and no-go zones
- Automatic recharge and resume, scheduling and real-time tracking in the app
- Works with Alexa and Google Home voice control, plus Siri Shortcuts
Cons
- Matter certification is still in progress, so Apple Home, SmartThings and Home Assistant arrive only after a future update
- 2.4 GHz Wi-Fi only, with no 5 GHz support
- Large dock that needs a clear spot
- No published runtime, dustbin or water tank capacity, or noise rating
Who is the iRobot Roomba Plus 678 Combo for?
This is iRobot's automated dock experience at a midrange step. It combines 30,000 Pa suction with a mop that the dock washes and dries, so the household sets a schedule and the dock handles most of the upkeep. Homes that mix carpet and hard floors, shed pet hair or long hair, and want the robot to run on its own are the clearest fit, as are Alexa and Google Home households.
What the Roomba Plus 678 Combo offers
Suction is rated at 30,000 Pa, with a hair-cutting multi-surface main brush and an anti-tangle edge-sweeping brush that keep long hair out of the works. Navigation is LiDAR with obstacle and cliff detection, multi-room mapping and no-go zones, and the app handles scheduling and real-time tracking. The mop is washed and dried by the dock, which also self-empties the bin and dispenses cleaning solution, and it lifts automatically when carpet is detected so rugs stay dry. The robot recharges itself and resumes cleaning. Alexa and Google Home voice control work today, and Siri works through Siri Shortcuts.
What to know before you buy
Matter support is the main open item: the robot is going through Matter certification, so Apple Home, SmartThings and Home Assistant reach it only after that update ships. Connectivity is 2.4 GHz Wi-Fi only, with 5 GHz networks not supported, which can complicate pairing on dual-band routers. The robot and dock are sizeable, with the dock measuring about 35 x 33.6 x 47.5 cm, so it needs a clear spot. The maker has not published a runtime, dustbin or water tank capacities or a noise rating for this model, so those comparison rows stay unknown for now.
Is the iRobot Roomba Plus 678 Combo worth it?
For a household that wants a carpet-capable suction rating together with a mop that is washed and dried by the dock and a bin that empties itself, the Plus 678 covers the essentials of a hands-off robot. The trade-offs are the unpublished runtime and capacity figures and smart-home integrations that are still catching up through Matter certification. An Alexa or Google Home household is the best fit; those who need Apple Home or Home Assistant today may prefer to wait for the certification update.
Frequently asked questions
Does the Roomba Plus 678 Combo work with Alexa, Google Home and Apple Home?
Alexa and Google Home voice control work today, and Siri works through Siri Shortcuts. Apple Home, SmartThings and Home Assistant are not available yet: the robot is going through Matter certification, so those platforms arrive once that update ships.
Does the mop wash and dry itself?
Yes. The AutoWash dock washes the mop roller and dries it, and it dispenses cleaning solution automatically.
Does the dock empty the robot?
Yes. The dock self-empties the robot's dustbin, so the bin does not need emptying after every run.
Is it safe for carpets and rugs?
Yes. It has a carpet cleaning mode and lifts the mop automatically when it is on carpet so rugs stay dry.
Does the Roomba Plus 678 Combo support 5 GHz Wi-Fi?
No. It connects on 2.4 GHz Wi-Fi only, and 5 GHz networks are not supported.













