Dreame L40s Ultra CE
A cheaper L40s with a full self-cleaning dock, for homes that want hands-off mopping on a budget and can live without hot-water washing.
Amazon $399.48$399.48
The Dreame L40s Ultra CE is the better robot vacuum overall, rated 4.4 to 4.1. The Dreame L40s Ultra CE leads on navigation. The iRobot Roomba Plus 415 Combo costs $19.49 less ($379.99 vs $399.48).
iRobot Roomba Plus 415 Combo
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.
Amazon $379.99$379.99
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Dreame L40s Ultra CE for navigation (LiDAR + 3D light vs LiDAR).
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 | Dreame L40s Ultra CE | iRobot Roomba Plus 415 Combo |
|---|---|---|
| Overall rating | 4.4/5 | 4.1/5 |
| Cleaning 30% | 73 not yet tested; estimated from 12 tested Dreame robots and the median of the 70 tested robots | 48 not yet tested; estimated from 3 tested iRobot robots and the median of the 70 tested robots |
| Value 25% | 92 $399 | 95 $380 |
| Dock 20% | 83 Self-empties the bin, washes the mop, hot-air mop drying | 100 Self-empties the bin, washes the mop, hot-air mop drying |
| Navigation 15% | 85 LiDAR + 3D light | 65 LiDAR |
| Mopping 10% | 76 Dual spinning pads, lifts 10.5 mm, extends to edges | 76 Dual spinning pads, lifts 10 mm, extends to edges |
Specifications
| Dreame L40s Ultra CE | iRobot Roomba Plus 415 Combo | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 13,000 Pa | - |
| Main brush | TriCut brush | tangle-free rubber brushes |
| Dustbin | 320 mL | - |
| Extending side brush | No | Yes |
| Mopping | ||
| Mop | Dual spinning pads, lifts 10.5 mm, extends to edges | Dual spinning pads, lifts 10 mm, extends to edges |
| Mop lift | 10.5 mm | 10 mm |
| Leaves mop at dock | No | No |
| Extending mop | Yes | Yes |
| Dock | ||
| Dock | Washes mop + empties | Washes mop + empties |
| Self-empties | Yes | Yes |
| Dust bag | 3.2 L | - |
| Washes mop | Yes | Yes |
| Hot-water wash | No | - |
| Hot-air drying | Yes | Yes |
| Detergent dosing | No | - |
| Clean water tank | 4.5 L | - |
| Navigation & app | ||
| Navigation | LiDAR + 3D light | LiDAR |
| Obstacle avoidance | Single-laser 3D structured light | Object sensing (sensor type not given) |
| Climbs thresholds | 20 mm | - |
| Voice assistants | Alexa, Siri, Google Assistant | - |
| Build | ||
| Height | 4.1 in (104 mm) | 3.3 in (84 mm) |
| Retracting LiDAR | No | - |
| Battery | 5,200 mAh | 5,200 mAh |
| Run time | Up to 4 h 20 min | - |
| Weight | 8.6 lb (3.9 kg) | 6.4 lb (2.9 kg) |
| Warranty | 3 years | - |
| Released | 2025-08 | 2026-07 |