iRobot Roomba Plus 678 Combo

Last updated: October 26, 2026

iRobot Roomba Plus 678 Combo
3.9/5#83 of 108 in self-cleaning dock robot vacuums
3.9

A strong pick for hard-floor homes that want hot-water roller mopping and a full-service dock for less than iRobot’s flagship 875.

  • Washes mop + emptiesDock
  • LiDAR + cameraNavigation
  • RollerMop
  • 3.9 inHeight
Check price at Amazon$899.99

Price checked October 26, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • Mops with hot water and pre-sprays stains it spots, which helps with dried spills
  • Roller extends up to 45 mm toward walls, so edges get mopped
  • Dock empties, washes at 176°F and dries with heat, so the mop stays clean
  • Climbs 3.5 cm thresholds and fits under furniture about 3.9 in high
Cons
  • Roller lifts only 10 mm, so thick rugs may need a no-mop zone
  • iRobot doesn’t publish runtime or dock tank sizes
  • Suction figure comes only from the Amazon listing

How it scores

The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.

Specifications

Vacuum
Claimed suction30,000 Pa
Main brushhair-cutting multi-surface bristle brush
Mopping
MopRoller, lifts 10 mm, extends to edges
Mop lift10 mm
Leaves mop at dockNo
Extending mopYes
Dock
DockWashes mop + empties
Self-emptiesYes
Washes mopYes
Hot-water washYes
Hot-air dryingYes
Detergent dosingYes
Navigation & app
NavigationLiDAR + camera
Obstacle avoidancePrecisionVision AI camera object recognition; SprayForce AI pre-treats detected stains
Climbs thresholds35 mm
Build
Height3.9 in (99 mm)
Battery6,000 mAh
Weight10.7 lb (4.8 kg)
Released2026-09

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