If you’re hunting for the best automatic litter box for large cats or an actual multi-cat household (as in three or more, not “two polite siblings”), the HomerunPET Self-Cleaning Litter Box CS106 is clearly trying to own that space.
It calls itself the world’s biggest self-cleaning litter box, and for once that claim isn’t marketing fluff. After testing a lot of automatic litter boxes (and rotating them through a laundry room that has seen more robotics than NASA), this one clearly leans toward space, stability, and long stretches between maintenance. Let’s get into it.
The HomerunPET CS106 is one of the largest automatic litter boxes I’ve tested, with a roomy 106L dome and oversized 12L waste bin. Designed for big cats and real multi-cat homes, it also features an auto-refill system, ultra-quiet operation, and strong safety sensors. If you want a more hands-off litter setup, this one delivers.
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HomerunPET Self-Cleaning Litter Box Top Features at a Glance
- 106L Spacious Dome: Genuinely roomy interior designed for cats up to 25 lbs and true multi-cat households.
- 12L Waste Bin: One of the largest waste drawers I’ve tested. Fewer trips to empty it.
- Industry-First Auto-Refill Litter System: TOF laser sensors detect when litter drops below 6L and automatically add more. Can last up to 14 days on a single refill.
- Ultra-Quiet Operation (38.8 dB): You hear gentle litter movement, not a mechanical production.
- Advanced Safety Sensors: Radar sensor near the entrance plus four weight sensors in the base. Stops immediately if a cat approaches or enters.
- Dual-Bump Anti-Pinch Design: The dome never fully closes, leaving an escape gap as an extra safety buffer.
- Hill-Shaped Litter Base: Designed to reduce buildup at the bottom and align with natural digging behavior.
- Wide Entrance: Easier entry and exit for larger cats.
- Smart App Control: Track visits, duration, and cleaning frequency. Adjust cleaning delay and auto-refill sensitivity.
- Touch Panel Controls: Can operate without the app—clean, reset, and empty directly from the unit.
- Fresh Gel Deodorizer: Helps neutralize odors.
- 90-Day In-Home Trial & 12-Month Warranty
- Dimensions: 27.44″ L × 23.62″ W × 28.07″ H
- Weight: 44 lbs
Pros and Cons at a Glance
| Pros | Cons |
|---|---|
|
• Extremely roomy interior (one of the largest tested) • Massive 12L waste bin for fewer emptying sessions • Auto-refill system with adjustable sensitivity • Very quiet operation (around 38.8 dB) • Heavy, stable base that doesn’t shift when larger cats exit • Strong safety features (radar + weight sensors + anti-pinch gap) • Works with most clumping litters (clay, tofu, mixed) • Can operate fully without the app • Responsive customer service • 90-day in-home trial |
• Heavier than most automatic litter boxes (44 lbs) • Slightly larger footprint than some competitors • Internal filter swap can be awkward (deep reach required) • Initial app setup may require manual pairing • Entrance height may require a step for seniors • Not suitable for kittens under 3.3 lbs |
Who Needs This Litter Box?
I think pretty much anyone with a cat could use it, but let’s narrow it down a bit more. It’s perfect for:
Large Cats
If you have a 20–25 lb cat who looks cramped in standard domes, this is the first automatic litter box I’ve tested that genuinely feels spacious inside. There’s room to turn, dig, and not feel like they’re using an airplane bathroom.
Real Multi-Cat Households (More Than Two)
That 12L waste bin matters. In a house with three or four cats, daily emptying defeats the purpose of automation. This one gives you breathing room.
Frequent Travelers
The auto-refill system plus large waste capacity can realistically give you up to two weeks of hands-off operation (depending on cat count, obviously). For weekend trips or extended work travel, that’s huge.
People with Health Conditions
If bending, lifting, or frequent scooping is difficult due to chronic pain, mobility challenges, or other health issues, the auto-refill plus larger waste drawer reduces how often you have to deal with litter.
Busy Households
If you just want the most “hands off” system possible and don’t feel like monitoring litter levels constantly, this one handles a lot on its own.
My Real-World Experience
Now that we’ve covered the basics, let’s get into how it performs in a real multi-cat household. A little context: I have 5 cats. They alternate between the laundry room box and one of the downstairs boxes, but the laundry room definitely sees the most action.
Of those cats, Luke and Zoe are definitely the biggest. They’re both around 15 lbs. Zoe probably shouldn’t be that chonky, but Luke comes by it naturally. Leia is smaller. I’m not entirely convinced that she’s not a munchkin cat. Lily is pretty much “average” size. Alex is long and thin, but he’s a cranky old man with vestibular disease who has his very own litter box.
My cats are all used to self-cleaning litter boxes AND used to me constantly swapping them out with new ones. So, there was no transition period here. In fact, Lily jumped in before I even finished putting it together. Thank freaking goodness she didn’t actually use it. She was just investigating.
Last note- While the litter box ended up in the laundry room, most of the pictures were taken downstairs in better lighting. Plus, my laundry room is neon green. For the record, I didn’t choose that color.
Okay. That’s enough background, right? On with the show…
The Space Question
It really is roomy. I’ve tested around ten automatic litter boxes at this point, and this one is easily the most spacious inside. The 12L waste tray is also the largest I’ve worked with.
Yes, the footprint is slightly bigger. It extends a bit farther and stands taller. But floor-space-wise? It’s not dramatically larger than the ones I’ve tried by PetKit, CatLink, Litter-Robot (not counting the smaller Evo).
It still fit in my laundry room where the others lived. I had to move a mop bucket. That’s about it. So, while it looks massive online, in practice it’s not a room-dominating appliance. I mean, it’s not small at all, but it’s not a total monster.
Before we move on from the size, I just want to mention one last thing. The box that it comes in is HUGE. I had a rather comical moment where I fell off my porch trying to bring it in by myself. Comical only because there was still 2 feet of snow to fall into. But seriously, you’re going to need help bringing inside. Don’t try it alone, kids.
The Weight (And Why It’s Actually a Plus)
At 44 lbs, it’s heavier than I’m used to, which is why they recommend taking it apart and starting by setting the base up where you want it. Everything comes apart easily when you’re actually trying to take it apart, but stays together securely when you’re not
One thing I do like about the heavier base is that this baby isn’t going to get knocked around by larger cats. I’ve had issues with some litter boxes in the past when Luke jumps out and basically launches it back, causing a “default position” error.
Auto-Refill: Surprisingly Useful
The auto-refill system is one of my favorite features. You fill the litter reservoir, and the box automatically adds more when levels drop below a threshold. You can adjust sensitivity or turn it off entirely and trigger manual refills through the app.
For multi-cat homes, this is super helpful. It prevents that slow decline into a shallow litter situation where everyone starts side-eyeing the box.
Safety Features
The safety system is excellent. If I got too close while it was cycling (trying to take photos), it stopped immediately. The radar sensor detects approach near the entrance, and the four weight sensors detect when a cat enters the dome. Just make sure it’s on a hard floor, not carpet, for accurate readings.
The dual-bump anti-pinch design means the dome never fully seals. Even in a worst-case scenario, there’s a breathing gap. It’s a thoughtful layer of redundancy.
Noise Level
It’s extremely quiet. I was sitting right next to it while it cycled and barely noticed it. It’s rated around 38.8 dB, and that feels accurate in real life. You hear soft litter movement, not motor noise.
If you keep litter boxes near living spaces or bedrooms, that matters.
Litter Compatibility
It works with traditional clay clumping litter, tofu litter, and mixed tofu-clay blends. That flexibility is important if you’ve already found a litter your cats tolerate and don’t want to change it.
What I’d Change
As awesome as it is, there are few things that I would change. None of them are deal-breakers.
The Filter Swap
Switching from the large-pore filter to the small-pore filter was… not my favorite 20 minutes.
The refill mechanism sits in a way that partially blocks your view, so you’re working by feel. It’s also fairly deep inside the dome. I have short arms (because I am a short person), and it wasn’t exactly ergonomic.
That said, you only need to change it once unless you’re constantly switching litter types. And someone with longer arms will probably have an easier time.
The App Setup
When I first tried to connect the app, it showed a network issue. I emailed customer service and got a response within minutes. There was a minor outage happening at that exact time. Perfect timing on my end.
Once that was resolved, the app didn’t automatically detect the unit. I had to manually connect it. It took a few extra steps, but once paired, everything worked smoothly.
Important note: You don’t need the app. You can clean, reset, and empty using the touch panel. The app just gives you more granular control and tracking.
Not Ideal for Tiny Kittens or Some Seniors
It’s not suitable for kittens under 3.3 lbs.
For seniors, the entrance is on the higher side. A simple step stool or platform solves that, but it’s something to plan for.
Final Thoughts
The HomerunPET Self-cleaning Litter Box CS106 isn’t trying to be the sleekest or smallest automatic litter box on the market. It’s built for capacity, stability, and reduced maintenance.
If you have:
- A genuinely large cat
- Three or more cats
- A busy schedule
- Travel plans
- Or simply zero interest in daily litter management
This is one of the most hands-off systems I’ve tested so far.
It’s substantial. It’s quiet. It’s stable. And it finally feels like an automatic litter box that was designed with big cats and real-life multi-cat households in mind—not just the brochure version.
The HomerunPET CS106 is one of the largest automatic litter boxes I’ve tested, with a roomy 106L dome and oversized 12L waste bin. Designed for big cats and real multi-cat homes, it also features an auto-refill system, ultra-quiet operation, and strong safety sensors. If you want a more hands-off litter setup, this one delivers.
BEST PRICE GUARANTEE
SAVE $60 WITH COUPON CODE PAWZ
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