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
The iRobot Roomba Plus 678 Combo and the Yeedi S20 Infinity Ultra are evenly matched, rated 3.9 and 3.9. The iRobot Roomba Plus 678 Combo leads on mopping.
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Yeedi S20 Infinity Ultra
ECOVACS’ FocusJet stain pre-spray and covered roller at a lower price under the yeedi name, for hard-floor homes with rugs who can live with few published specs.
Amazon $899.99$899.99
Which should you buy?
- Choose the iRobot Roomba Plus 678 Combo for mopping (Roller, lifts 10 mm, extends to edges vs Roller).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every self-cleaning dock robot vacuum; a clear win is highlighted. How we rank explains each one.
| Factor weight | iRobot Roomba Plus 678 Combo | Yeedi S20 Infinity Ultra |
|---|---|---|
| Overall rating | 3.9/5 | 3.9/5 |
| Cleaning 30% | 48 not yet tested; estimated from 3 tested iRobot robots and the median of the 80 tested robots | 75 not yet tested; estimated from 2 tested Yeedi robots and the median of the 80 tested robots |
| Value 25% | 42 $900 | 42 $900 |
| Dock 20% | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying |
| Navigation 15% | 100 LiDAR + camera | 50 navigation not published (neutral score used) |
| Mopping 10% | 90 Roller, lifts 10 mm, extends to edges | 70 Roller |
Specifications
| iRobot Roomba Plus 678 Combo | Yeedi S20 Infinity Ultra | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 30,000 Pa | 22,000 Pa |
| Main brush | hair-cutting multi-surface bristle brush | anti-tangle main brush (ZeroTangle 4.0) |
| Mopping | ||
| Mop | Roller, lifts 10 mm, extends to edges | Roller |
| Mop lift | 10 mm | - |
| Leaves mop at dock | No | No |
| Extending mop | Yes | - |
| Dock | ||
| Dock | Washes mop + empties | Washes mop + empties |
| Self-empties | Yes | Yes |
| Washes mop | Yes | Yes |
| Hot-water wash | Yes | Yes |
| Hot-air drying | Yes | Yes |
| Detergent dosing | Yes | - |
| Navigation & app | ||
| Navigation | LiDAR + camera | - |
| Obstacle avoidance | PrecisionVision AI camera object recognition; SprayForce AI pre-treats detected stains | RGBD (RGB camera plus depth) AI obstacle avoidance with stain and large-particle recognition |
| Climbs thresholds | 35 mm | - |
| Build | ||
| Height | 3.9 in (99 mm) | - |
| Battery | 6,000 mAh | - |
| Weight | 10.7 lb (4.8 kg) | - |
| Warranty | - | 1 year |
| Released | 2026-09 | 2026-05 |