Roborock F25 BX vs Roborock F25 Ultra
Quick take: The Roborock F25 BX costs $210 less; the Roborock F25 Ultra has stronger suction (22,000 vs 20,000 Pa).
Which one to buy
Steam is what the extra $259 buys, and not much else that owners rate. The Roborock F25 Ultra adds a steam mode for grease and stuck-on grime and a separate 187°F hot-water mode, and its testing results for mopping and residual moisture beat the category average. Owners say the steam lifts dried kitchen spills that plain water leaves behind, and it's rated far quieter at 53 dB. It also has app control.
The Roborock F25 BX keeps the rest of the platform for less than half the price. It's rated at 20,000 Pa against 22,000, runs a 194°F hot self-clean with hot-air drying, and its DirTect sensor ramps power and water on bigger messes. Owners say it feels clean underfoot after one pass, its roller gets close to baseboards, and it keeps full suction lying flat at about 4.9 inches under beds and sofas. At 9.3 lbs with powered wheels, owners with wrist trouble call it easy to push.
The Ultra's extras come with costs. It weighs 12.1 lbs, owners find it heavy over thresholds and too bulky for low furniture, and its base suction measured below the category average in testing. The heated modes drain the battery to 15-25 minutes, and testers saw about 30% gone in 10 minutes of hot-water cleaning. Owners also say corners fall short and the mop pad still needs hand-cleaning.
The BX has its own chores. Owners insist the dirty-water tank be emptied and rinsed after every run or it smells foul, the self-clean leaves hair after heavy messes, Max mode is shop-vac loud, and there's no carry handle for stairs. Both carry a 1-year warranty and are for hard floors only. Buy the BX for most homes. Pay for the Ultra if greasy kitchen floors or dried-on messes are a weekly fight and you'll use steam for spot work rather than whole-house cleans.
Roborock F25 BX
The better pick for strong, light, under-furniture floor washing at less than half the price, if you'll empty the dirty tank after every use.
Roborock F25 Ultra
Pick the Roborock F25 Ultra if you want steam for greasy or dried-on messes and a quieter machine, and accept extra weight and short runtime in the heated modes.
| Spec | Roborock F25 BX | Roborock F25 Ultra |
|---|---|---|
| Price | ~$260 | ~$470 |
| Type | Hard Floor Washer | Hard Floor Washer |
| Suction | 20,000 Pa | 22000 Pa |
| Battery | 60 min | 60 min |
| Navigation | — | — |
| Filtration | — | Multi-stage filtration |
| Cordless | Yes | Yes |
| Bagged | — | — |
| Noise | — | 53 dB |
| Dustbin | 720 ml | — |
| Water tank | 870 ml | 1000 ml |
| Self-empty dock | No | No |
| Auto mop washing | No | No |
| Hot water washing | No | No |
| Obstacle avoidance | No | No |
| Carpet detection | No | No |
| Auto mop lifting | No | No |
| Multi-floor mapping | No | No |
| App control | No | Yes |
| Dimensions | 10.31 x 9.53 x 43.31 in | 10.4 x 9.7 x 43.1 in |
| Weight | 13.67 lbs | 12.1 lbs |
| Warranty | 1 year | 1 year |
Pros & cons
Roborock F25 BX
- ✓Class-leading suction and cleaning performance at a budget price
- ✓60-minute Eco runtime and 870 ml clean tank cover big floors in one go
- ✓DirTect sensor auto-boosts on heavier messes so you don't fiddle with modes
- ✓180° lie-flat design reaches under low furniture
- ✓Hot 194°F self-clean and 5-minute hot-air dry keep the roller smell-free
- ✓Zero-tangle roller holds up well with pet hair
- ✗Loud at full power — one of the noisier machines in the category
- ✗Only a 1-year warranty versus 2-3 years from rivals
- ✗Roborock's F25 variant naming (BX/LT/XT/ALT/ACE/GT/Ultra) is a minefield when comparing prices
- ✗Hard floors only — no carpet mode
- ✗No published noise figure and limited smart/app functionality at this tier
Roborock F25 Ultra
- ✓Combined mop score of 151.5 in independent testing versus a 115-point category average
- ✓Unique dual heating: 356°F steam mode plus a separate 187°F hot-water mode for everyday use
- ✓5-minute self-clean cycle (356°F steam, 203°F hot-air dry) meaningfully reduces roller odor between uses
- ✓Leaves less residual moisture on floors than the category average, reducing streaking
- ✓Powered SlideTech 2.0 wheels keep it maneuverable despite the added weight
- ✗At 12.1 lbs it's noticeably heavier in hand than most competitors in this category
- ✗Base suction (1.05 kPa measured) actually runs below the 1.17 kPa category average
- ✗Steam and hot-water modes drain the battery to just 15-25 minutes, so whole-home cleans need Auto mode
- ✗Premium pricing for the category, and the dirty-water tank capacity isn't published
- ✗Hard floors only — no carpet cleaning capability
Roborock F25 BX vs Roborock F25 Ultra: common questions
Can the F25 Ultra reach under furniture like the F25 BX?▾
Owners suggest not as well. BX owners say it keeps full suction flat at about 4.9 inches under beds and sofas. Ultra owners and reviewers say it's heavy and too bulky for low furniture, even though it's described as able to lie flat.
How long does the F25 Ultra run with steam or hot water on?▾
It runs 15-25 minutes in the heated modes, and owners saw about 30% of the battery used in 10 minutes of hot-water cleaning. Use Auto mode for whole-house runs and save steam for problem spots.
Is the F25 BX's dirty-water tank really that much work?▾
Owners say it's the one non-negotiable chore. Empty and rinse it after every use, which takes under a minute, or it develops a foul smell within a few days. Ultra owners also describe hand-cleaning the mop pad after use.