Roborock
Comparison · 2 robots
Roborock S8 Max Ultra with Refill & Drainage System · Roborock S8 Pro Ultra
All robot vacuums. Every measure below is plotted against the full class, so a difference can be read against how much the class itself varies.
- Roborock S8 Max Ultra with Refill & Drainage System
- Roborock S8 Pro Ultra
01 Classification
What each one does on its own.
The Autonomy Ladder is the same five rungs for every robot on the site. A rung describes the conditions a robot handles without you, not how good it is.
V
Generalized
Any task, any setting
IV
Environmental
Handles new obstacles without help
III
Conditional
Finishes familiar jobs on its own
Roborock S8 Max Ultra with Refill & Drainage SystemRoborock S8 Pro Ultra
II
Assisted
Runs preset routines, needs rescue
I
Manual
One action, on command
02 Assessment
Where they actually differ.
The Robovations Score is nine inputs across three pillars, each weighted as shown and each scored so that more is better. A robot can lead on one and trail on another, which is the point of showing them apart. Cost of ownership and data handling are reported on each robot's own page and are never averaged into the score.
Capability
Task completion16% of score
Does it finish the job it is sold to do, unattended
7475
- Roborock S8 Max Ultra with Refill & Drainage System74
- Roborock S8 Pro Ultra75
18median 72 across 428 scored robots100
Coverage and navigation10% of score
Does it work the whole area, and hold that between runs
78100
- Roborock S8 Max Ultra with Refill & Drainage System78
- Roborock S8 Pro Ultra100
0median 70 across 416 scored robots100
Edge-case recovery10% of score
Does it recover from the failures its category presents
6879
- Roborock S8 Max Ultra with Refill & Drainage System68
- Roborock S8 Pro Ultra79
18median 52 across 317 scored robots100
Operating envelope4% of score
How far conditions can vary before performance drops
7084
- Roborock S8 Max Ultra with Refill & Drainage System70
- Roborock S8 Pro Ultra84
28median 68 across 392 scored robots100
Dependability
Field failure rate16% of score
Documented hardware failures per owner-year
7088
- Roborock S8 Max Ultra with Refill & Drainage System70
- Roborock S8 Pro Ultra88
6median 70 across 355 scored robots100
Software stability14% of score
Whether updates fix more than they break
6577
- Roborock S8 Max Ultra with Refill & Drainage System65
- Roborock S8 Pro Ultra77
15median 65 across 339 scored robots100
Support longevity10% of score
Committed parts, service and updates, with dates
6297
- Roborock S8 Max Ultra with Refill & Drainage System62
- Roborock S8 Pro Ultra97
0median 62 across 424 scored robots100
Ownership burden
Routine maintenance12% of score
Hands-on time it asks for in normal operation
8897
- Roborock S8 Max Ultra with Refill & Drainage System88
- Roborock S8 Pro Ultra97
22median 67 across 429 scored robots100
Consumables8% of score
Parts that must be bought to keep it working
6483
- Roborock S8 Max Ultra with Refill & Drainage System64
- Roborock S8 Pro Ultra83
8median 69 across 429 scored robots100
03 Measured against the class
How far apart is a long way?
A number only means something next to the spread it sits in. Each track below is the real range across every classified robot in the class, with the median marked.
Price214 with a published figure
$1,699.99$1,599
- Roborock S8 Max Ultra with Refill & Drainage System$1,699.99
- Roborock S8 Pro Ultra$1,599
$160median $799.99$2,599
Suction (mode not stated)207 with a published figure
8,000 Pa6,000 Pa
- Roborock S8 Max Ultra with Refill & Drainage System8,000 Pa
- Roborock S8 Pro Ultra6,000 Pa
1,000 Pamedian 10,000 Pa42,000 Pa
Runtime186 with a published figure
180 min180 min
- Roborock S8 Max Ultra with Refill & Drainage System180 min
- Roborock S8 Pro Ultra180 min
60 minmedian 180 min360 min
Height223 with a published figure
3.8 in3.8 in
- Roborock S8 Max Ultra with Refill & Drainage System3.8 in
- Roborock S8 Pro Ultra3.8 in
2.6 inmedian 3.8 in7.8 in
Not compared, because fewer than two of these robots carry a published figure: Charge time, Noise, Weight.
04 Ownership
What the numbers leave out.
The trade-off
What each design gives up to be good at what it is good at.
Roborock S8 Max Ultra with Refill & Drainage System
The dock takes over every water chore, and in exchange it needs plumbing work before its first run.
Structured-light obstacle avoidance keeps a camera out of the home; Vacuum Wars found the camera model avoided obstacles better.
Roborock S8 Pro Ultra
Dock automation reduces hands-on effort but requires monthly filter maintenance and significant floor space, offsetting convenience gains for small homes or renters.
Sonic mop vibration excels on sealed hard floors but underperforms on textured grout and tile compared to manual scrubbing.
Who each one is wrong for
Stated by the record itself. A robot being wrong for a household is a fact about fit, not a fault.
Roborock S8 Max Ultra with Refill & Drainage System
- Renters or homes without a nearby water line and drain
- The dock must connect to a water supply and a drain within Roborock's stated distances, which many layouts cannot provide.
- Buyers who want a camera for obstacle recognition
- It uses structured light rather than a camera, and Vacuum Wars found the camera-equipped S8 MaxV Ultra avoided obstacles better.
- Dock sites behind a threshold over 2 cm
- Roborock's installation guidance warns against thresholds, tracks or steps above 2 cm between the dock and the cleaning area.
- Buyers who need an independent test of the plumbed version
- Vacuum Wars tested the standard-dock S8 Max Ultra and said it had not reviewed the refill and drainage variant.
Roborock S8 Pro Ultra
- Homes with irregular layouts or constant furniture rearrangement
- No L4 adaptation. Frequent rearrangement requires manual map updates via app.
- Owners unwilling to provide monthly dock maintenance
- Dock filter rinse and sump cleaning required monthly. Missing maintenance voids autonomy and risks pump damage.
- Homes with no permanent spot for the dock
- The dock takes roughly 43 by 45 cm of floor, stands about 51 cm tall, and needs an outlet plus a clear approach path. It is not something to move between rooms between runs.
- Homes with high-pile carpet or thick shag
- Suction and mop design optimized for medium pile and hard floors. High nap tangles brush and reduces autonomy.
What stays your job
The upkeep ownership hands back to you, whatever the autonomy level says.
Roborock S8 Max Ultra with Refill & Drainage System
- As needed: Replace the 2.5 L dock dust bag; Roborock sells 6-packs.
- Every 3-6 months: Refill the 580 ml detergent tank, which Roborock says lasts over three months.
- As needed: Check the water inlet and drain connections for leaks, per Roborock’s installation notes.
- As needed: Replace mop cloths and edge mop cloths; Roborock’s US store sells both.
- As needed: Replace the washable filters and main brush pack, which Roborock’s US store sells for the S8 Max Ultra.
Roborock S8 Pro Ultra
- Weekly: Empty dustbin (0.4L), inspect side brush for hair tangles.
- Weekly: Rinse mop pads if dock wash not used; check for mat fibers.
- Monthly: Dock filter rinse under running water, sump inspection for dust.
- Monthly: Wipe the LiDAR turret and the front sensor window with a soft cloth.
- Every 3-6 months: Inspect dock pump inlet for debris clogs.
- Annually: Replace main brush and side brush (OEM cost ~$40).
05 Evidence
How much each of these is standing on.
Classifications rest on different depths of evidence. A pre-release assessment and a verified one are not the same kind of claim.
| Robot | Evidence status | Sources reviewed | Last assessed |
|---|---|---|---|
| Roborock S8 Max Ultra with Refill & Drainage System | Provisional | 5 | Sep 2026 |
| Roborock S8 Pro Ultra | Provisional | 8 | Aug 2026 |
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