The catch
PETKIT PuraMax 2 Basic Bundle
It is not for cats younger than six months or below 3.3 pounds.
Side by side
PuraMax 2 vs Litter-Robot 4: PuraMax fits into lower space, and Litter-Robot offers a carpet-tray weighing option
Quick verdict
For a lower space and more freedom in clumping litter, PuraMax 2 is the fit. Litter-Robot 4 covers a larger recommended range of cats and has a carpet-tray option for weight readings.
Before you buy
Why, and what it costs you
PuraMax 2 is almost eight inches lower
The cabinet comes in 7.77 inches shorter.
Where this comes from
29.5 minus 21.73 equals 7.77 inches. Space needed for disassembly is not counted.
The catch
Whisker Litter-Robot 4 with Step and Waste Drawer Liners
A timid cat may still find the globe closed in.
PETKIT PuraMax 2 Basic Bundle
- Why pick it
- The planned spot has no room for a 29.5-inch-tall cabinet.
- A camera-free box appeals to you, and you already use a compatible plant-based clumping litter.
- The catch
- It is not for cats younger than six months or below 3.3 pounds.
Whisker Litter-Robot 4 with Step and Waste Drawer Liners
- Why pick it
- The PuraMax 2 listed 22-pound range is lower than your adult cat's weight.
- A wider front opening or the documented carpet-tray option is something you need.
- The catch
- A timid cat may still find the globe closed in.
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What this page compares
How PuraMax 2 and Litter-Robot 4 differ in cabinet height, cat size and supported litter, plus what camera-free weight tracking can and cannot do in practice.
Which one fits
Pick the situations that sound like you
A low shelf over the box
PuraMax 2 stands 7.77 inches lower.
- PETKIT PuraMax 2 Basic Bundle
- Better fit
- Whisker Litter-Robot 4 with Step and Waste Drawer Liners
- Caution
A 23-pound adult cat
LR4 alone has this weight inside its published range.
- PETKIT PuraMax 2 Basic Bundle
- Caution
- Whisker Litter-Robot 4 with Step and Waste Drawer Liners
- Good
No camera preferred
A built-in camera is on neither one.
- PETKIT PuraMax 2 Basic Bundle
- Good
- Whisker Litter-Robot 4 with Step and Waste Drawer Liners
- Good
Plant-based clumping litter I already use
Compare the exact plant-based formula and the PuraMax screen it requires with the manual. Whisker says plant-based types typically do not sift properly in LR4. A broad plant-litter label doesn't approve every formula.
- PETKIT PuraMax 2 Basic Bundle
- Depends
- Whisker Litter-Robot 4 with Step and Waste Drawer Liners
- Caution
In practice
Differences you will notice
PuraMax 2 is almost eight inches lower
The cabinet comes in 7.77 inches shorter.
How we worked this out
29.5 minus 21.73 equals 7.77 inches. Space needed for disassembly is not counted.
The smaller body takes about 13 percent less bare floor area
Against 594 square inches, PuraMax 2 uses about 517.
How we worked this out
21.18 times 24.41 equals 517.0038. 22 times 27 equals 594. The difference divided by 594 equals 13.0 percent.
22 pounds is where the shared adult weight range ends
A 23-pound cat falls within the LR4 range but over the PuraMax 2 listing range.
How we worked this out
The overlap of 3.3 to 22 and 3 to 25 is 3.3 to 22 pounds. Body length and willingness to go in still matter.
Option A
PETKIT, P9902
PuraMax 2 Basic Bundle
A rotating litter box without a camera, offering weight-based cat records, a 7-liter waste drawer and app control over 2.4 GHz.
- Best for
- Adult cats on clumping litter in a household that would rather not have a litter-box camera
Facts we checked
- According to the P9902 manual, it measures 24.41 by 21.18 by 21.73 inches and weighs about 22 pounds.
- A 76-liter interior and a 7-liter waste drawer are what the exact listing specifies.
- It identifies cats by weight and does not use a built-in camera.
- N50 2.0 odor remover and 20 waste bags come in the basic bundle.
Option B
Whisker, Litter-Robot 4
Litter-Robot 4 with Step and Waste Drawer Liners
Automatic cycling starts at 3 pounds, and the cabinet is 22 inches wide.
- Best for
- cover two or more cats and keep tabs on which one used it
Facts we checked
- A cat must weigh at least 3 pounds for automatic mode.
- With a 22 by 27 inch footprint, the cabinet is 22 inches wide.
- Clumping clay is Whisker's recommendation, and it says plant-based litters typically do not filter properly.
- A sealed waste drawer is used, and the model supports up to four cats.
Spec by spec
Where they really differ
| Spec | PETKIT PuraMax 2 Basic Bundle | Whisker Litter-Robot 4 with Step and Waste Drawer Liners | In practice |
|---|---|---|---|
| Cabinet height | 21.73 inches | 29.5 inches | PuraMax 2 fits beneath a lower obstruction, provided there is service clearance. |
| Footprint | 21.18 by 24.41 inches | 22 by 27 inches | The bare rectangle PuraMax 2 occupies is smaller. |
| Published cat range | 3.3 to 22 pounds and over six months | 3 to 25 pounds | Age and weight limits vary. |
| Litter guidance | Compatible clumping litter, including suitable plant types | Clumping clay recommended, plant types typically unsuitable | The litter you already use can decide the purchase. |
| Floor guidance | Hard flat floor | Carpet Tray available for better weight accuracy | Depending on the location, an extra Whisker accessory may be needed. |
Trade-offs
What each pick costs you
With PETKIT PuraMax 2 Basic Bundle
- K3 Smart Spray does not work with this exact basic bundle.
With Whisker Litter-Robot 4 with Step and Waste Drawer Liners
- Open rake boxes sit lower, since this tall body needs more vertical room.
Change of plan
When the answer changes
Your cat won't use a globe, and you want a wide, open entry
Neither model fits. An open entry and video come with Luma, along with separate subscription and hard-floor requirements.
Decision guide
How to decide
PuraMax 2 is the fit for a lower space and for owners who want flexibility in clumping litter. A larger recommended cat range and a carpet-tray option for weight readings come with Litter-Robot 4.
On a utility-room shelf
The taller Whisker body won't fit in some spots where PuraMax 2 is low enough to go. Still leave space to take out the cylinder and empty the side drawer. If a cabinet barely clears the top, regular cleaning can become a lifting chore.
With cats already used to a rotating box
Neither adds a camera to the room, yet both give you usage records. When cats weigh nearly the same, recognition by weight tells you less. Let the cat and the floor decide which box you buy before you lean on individual charts.
If you want to keep your litter
Whisker's current guidance is far narrower than a generic claim about clumping litter. A compatible plant-based formula may work in PuraMax 2, though particle size and firm clumping still matter. Try the approved litter and move over to it gradually.
What this page can’t tell you
- No hands-on testing of noise, odor or cat acceptance was done.
- Claimed waste-storage days are manufacturer estimates and do not replace daily checks. The app's records can't diagnose illness.
By the numbers
What the data shows
What we found across the automatic litter boxes we compare, plus the checked facts behind each finding.
How many fit
None of the 24 models checked meets all of “Keep cameras out of my home”, “Keep using the clumping litter I have”, “Slide under a counter”, and “House a cat above 15 pounds”, so the pick goes to the closest practical compromise.
0 models fit, out of 24 checkedShow the facts and the math
How we countedThe count uses each product's current fit ratings for “Keep cameras out of my home”, “Keep using the clumping litter I have”, “Slide under a counter”, and “House a cat above 15 pounds”. A need with no documented match is not counted.
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| PETKIT PuraMax 2 Basic Bundle |
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| Whisker Litter-Robot 4 with Step and Waste Drawer Liners |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
PETKIT PuraMax 2 Basic Bundle
The planned spot has no room for a 29.5-inch-tall cabinet.
See price & reviews on AmazonWhisker Litter-Robot 4 with Step and Waste Drawer Liners
The PuraMax 2 listed 22-pound range is lower than your adult cat's weight.
See price & reviews on AmazonEach link opens in a new tab.
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