iRobot Roomba Plus 678 Combo
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.
Amazon $899.99$899.99
3.9/5
A low-profile entry to iRobot’s self-washing mop docks for hard-floor homes; the Plus 515 adds hot-water washing for a little more.
- Washes mop + emptiesDock
- LiDARNavigation
- Dual spinning padsMop
- 3.3 inHeight
Check price at Amazon$599
Price checked October 26, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Only 3.29 in tall, so it fits under most sofas and beds
- Dock empties the bin, washes the pads mid-clean and dries them with heat
- Edge brush and pads extend toward walls, so edges get swept and mopped
- Rubber brushes resist hair wrap
Cons
- No camera, so it is likelier to run into cords and pet mess than camera models
- iRobot doesn’t say the wash water is heated
- iRobot doesn’t publish suction, runtime or threshold figures
The iRobot Roomba Plus 415 and 515 family
Every iRobot Roomba Plus 415 and 515 model we rank, smallest first. Ratings compare each against its own type.
| Model | Dock | Rating | Price |
|---|---|---|---|
| iRobot Roomba Plus 515 Combo | Washes mop + empties | 3.9/5 | $599.99 |
| iRobot Roomba Plus 415 Combo (this one) | Washes mop + empties | 3.9/5 | $599 |
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 | |
|---|---|
| Main brush | tangle-free rubber brushes |
| Extending side brush | Yes |
| Mopping | |
| Mop | Dual spinning pads, lifts 10 mm, extends to edges |
| Mop lift | 10 mm |
| Leaves mop at dock | No |
| Extending mop | Yes |
| Dock | |
| Dock | Washes mop + empties |
| Self-empties | Yes |
| Washes mop | Yes |
| Hot-air drying | Yes |
| Navigation & app | |
| Navigation | LiDAR |
| Obstacle avoidance | Object sensing (sensor type not given) |
| Build | |
| Height | 3.3 in (84 mm) |
| Battery | 5,200 mAh |
| Weight | 6.4 lb (2.9 kg) |
| Released | 2026-07 |
Alternatives in this type
Shark PowerDetect NeverTouch Pro
Fine for smaller homes with mostly hard floors and carpet that needs a deep clean, but the newer ThermaCharged adds heated washing and better pet hair pickup for less money at Shark.
Amazon $769.99$769.99
iRobot Roomba Plus 515 Combo
For large, low-furniture homes that want a hot-wash mopping dock and long runtime without paying for camera obstacle avoidance.
Amazon $599.99$599.99
Compare
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