PETKIT PuraMax 2 Self-Cleaning Cat Litter Box (P9902) vs Whisker Litter-Robot 4, White (LR4-0101-00-US)
These are side-by-side facts taken from each product guide: published specifications, strengths and caveats as their sources state them. This page is not a test, a ranking or a verdict about which model is better.
Check PETKIT PuraMax 2 Self-Cleaning Cat Litter Box (P9902) on AmazonCheck Whisker Litter-Robot 4, White (LR4-0101-00-US) on Amazon
PETKIT PuraMax 2 Self-Cleaning Cat Litter Box (P9902)
Adult-cat homes with a hard, uncarpeted floor and clearance from walls
The PuraMax 2 is PETKIT's rotating-cylinder automatic box with an OLED panel, a 7 L sealed waste bin and an N50 odor eliminator. PETKIT's manual says cats under six months or under 1.5 kg are not recommended, and a Kitten Mode turns automatic cleaning off entirely. It needs a hard floor, a gap from the wall and clumping litter within a stated particle size.
Published specifications
- Manual: model P9902, 620 x 538 x 552 mm (24.41 x 21.18 x 21.73 in), about 10 kg (22 lb)
- Manual: cats younger than six months and cats under 1.5 kg are not recommended; listing FAQ adds a 10 kg (22 lb) maximum
- Manual: rated input 12V 2A; Wi-Fi and BLE; listing states 2.4 GHz
- Manual: no litter particles longer than 1.2 cm or over 3 mm diameter; FAQ names clay, tofu and mixed clumping litter
- Listing FAQ: 7 L waste bin, up to 15 days for one cat by PETKIT's lab result; N50 replaced about monthly
- PETKIT warranty policy: 2 years for PuraMax 2 bought on or after 1 Jan 2025 from PETKIT or an authorized US distributor
Strengths
- PETKIT publishes a full manual, a warranty policy and a model-specific FAQ, all naming P9902 or T4-2
- Runs from an on-unit OLED menu, so filling, levelling and cleaning do not require the phone
- Maintenance table names each washable part, its cleaning method and when to replace it
Caveats
- Not recommended for cats under six months or under 1.5 kg, and Kitten Mode disables automatic cleaning
- PETKIT's own documents give two different wall gaps (5 cm and 10 cm) and two cat-weight floors (3.3 lb and 3.5 lb)
- Carpets and mats are ruled out by the listing as interfering with the sensors
Read the full PETKIT PuraMax 2 Self-Cleaning Cat Litter Box (P9902) guide
Whisker Litter-Robot 4, White (LR4-0101-00-US)
Households with up to four cats that each weigh at least three pounds, with a firm, level spot that leaves clearance on every side.
Whisker's automatic sifting litter box, 29.5 by 22 by 27 inches and 24 pounds, with a 15.75 inch square entryway, a 14 by 14 inch litter bed, a sealed waste drawer, weight sensing and app reporting of litter and waste levels.
Published specifications
- Assembled size 29.50 in high x 22.00 in wide x 27.00 in deep; weight 24 lb (manual)
- Entryway 15.75 x 15.75 in, 12.00 in from the floor, or 6.90 in to the optional step plus 4.50 in
- Litter bed 14.00 x 14.00 in; inside globe 19.00 x 18.00 in, 15-17 in high depending on litter level
- Waste drawer 5.50 x 13.50 x 9.25 in; takes Whisker liners or any 10-13 gallon (37-49 l) trash bag
- Suits up to 4 cats; each cat must weigh at least 3 lb (1.4 kg) for Automatic Mode
- Optional sealed 12V DC 1.3 Ah backup battery; Wi-Fi and night light are disabled while it runs
Strengths
- The manual publishes the entryway, litter bed, globe interior and waste drawer sizes alongside the assembled size, so each can be checked against your space.
- The manual gives emptying intervals of once a week for one cat and twice a week for two average-sized cats, and liners can be any 10-13 gallon bag.
- An optional backup battery switches in automatically when power is lost, and the app reports litter and waste levels after each use.
Caveats
- The listing prints two sets of dimensions and neither matches the manual's 29.50 by 22.00 by 27.00 inches.
- It must stand clear of walls on a firm, level surface for accurate weight measurement, and Whisker sells a Carpet Tray separately for carpet.
- The 90-day in-home trial is coordinated with whoever sold you the unit, not with Whisker, when the purchase is not direct.
Read the full Whisker Litter-Robot 4, White (LR4-0101-00-US) guide
How to choose between them
Choose the PETKIT PuraMax 2 Self-Cleaning Cat Litter Box (P9902) if your situation matches: Adult-cat homes with a hard, uncarpeted floor and clearance from walls. Its main caveat: Not recommended for cats under six months or under 1.5 kg, and Kitten Mode disables automatic cleaning.
Choose the Whisker Litter-Robot 4, White (LR4-0101-00-US) if your situation matches: Households with up to four cats that each weigh at least three pounds, with a firm, level spot that leaves clearance on every side. Its main caveat: The listing prints two sets of dimensions and neither matches the manual's 29.50 by 22.00 by 27.00 inches.
Both entries repeat what each guide records. Confirm the model, included parts and availability on the current listing before ordering.
Primary sources
- PETKIT PuraMax 2 user manual (model P9902 / T4-2), EN V1.3 Source for PETKIT PuraMax 2 Self-Cleaning Cat Litter Box (P9902)
- PETKIT manual downloads index linking the PuraMax 2 manual Source for PETKIT PuraMax 2 Self-Cleaning Cat Litter Box (P9902)
- PETKIT Limited Warranty Policy naming PuraMax 2 in the 2-year upgrade list Source for PETKIT PuraMax 2 Self-Cleaning Cat Litter Box (P9902)
- PuraMax 2 FAQ sheet supplied with the Amazon listing Source for PETKIT PuraMax 2 Self-Cleaning Cat Litter Box (P9902)
- Whisker Litter-Robot 4 product page Source for Whisker Litter-Robot 4, White (LR4-0101-00-US)
- Litter-Robot 4 user manual (listing-supplied copy) Source for Whisker Litter-Robot 4, White (LR4-0101-00-US)
Primary sources checked .