PETKIT PuraMax 2 Self-Cleaning Cat Litter Box (P9902) vs Whisker Litter-Robot 4 with Step and Fence, Black (LR4-0301-00-CA)
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.
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 with Step and Fence, Black (LR4-0301-00-CA)
Multi-cat homes with floor space clear of every wall
Whisker's Litter-Robot 4 sifts clumps into a sealed drawer after each use and reports litter and waste levels to the Whisker app. Its manual sets one hard rule: a cat must weigh at least 1.36 kg, about 3 pounds, to use Automatic Mode, and lighter kittens need a supervised manual routine instead. It must not touch a wall, wants a hard level floor for its scale, and takes clumping litter only.
Published specifications
- Listing model and part LR4-0301-00-CA; manual's SKU table lists it as Litter-Robot 4 with Step, Black
- Manual: cats must weigh at least 1.36 kg for Automatic Mode; FAQ says under 3 lb is not recognised by the scale
- Maker page: 22 x 27 in footprint, 24 lb empty, 15 V DC; FAQ entryway 15.75 x 15.75 in, no upper weight limit stated
- Manual: clumping litter to the MAX line, about 3.6-4.5 kg or 4 L; non-clumping, newspaper and wood pellets excluded
- Manual: custom liners or any 37-49 L trash bag; carbon filter about one month; clean cycle 2 minutes
- FAQ: 2.4 GHz Wi-Fi only, 5 GHz not supported; WhiskerCare 1-year, 3-year plan sold separately
Strengths
- Whisker publishes the exact SKU, the weight rule, entryway size and interior globe size for this model
- Runs from a five-button panel without Wi-Fi, and the Connect button turns Wi-Fi off
- Globe, bonnet and drawer lift off for washing, and the carbon filter is described as optional
Caveats
- Automatic Mode needs every cat at 1.36 kg or more; under that the maker's own answer is a supervised manual routine
- Must not touch any wall or corner, and the manual says scale accuracy drops on carpet without the separate Carpet Tray
- Ongoing spend on liners, carbon filters and base seal strips, and battery backup is a separate kit
Read the full Whisker Litter-Robot 4 with Step and Fence, Black (LR4-0301-00-CA) 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 with Step and Fence, Black (LR4-0301-00-CA) if your situation matches: Multi-cat homes with floor space clear of every wall. Its main caveat: Automatic Mode needs every cat at 1.36 kg or more; under that the maker's own answer is a supervised manual routine.
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 instruction manual (PDF, SKU table lists LR4-0301-00-CA) Source for Whisker Litter-Robot 4 with Step and Fence, Black (LR4-0301-00-CA)
- Whisker Litter-Robot 4 product page with published specs Source for Whisker Litter-Robot 4 with Step and Fence, Black (LR4-0301-00-CA)
- Whisker Litter-Robot 4 Frequently Asked Questions support article Source for Whisker Litter-Robot 4 with Step and Fence, Black (LR4-0301-00-CA)
Primary sources checked .