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By Marcus Bell · Dog nutrition editor · Published 2026-05-15 · Updated 2026-07-01

4.4 (3,172) Amazon rating$19.996,000+ bought last month

Our verdict

The HOOISE S15 is a compact 74oz stainless steel fountain that has become one of the best-selling cat fountains on Amazon, currently ranking #9 in the category on strong recent sales.

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Best for

Single-cat or two-cat homes that want a compact, budget-friendly stainless steel fountain with a strong sales track record.

Skip if

You need a large-capacity fountain for three or more cats; at 2.2 liters this is on the smaller side.

  • Breed size Small
  • Weight 600 Grams
  • Priced 20% below the category median ($24.99 across 43 tracked models)

Our scorecard

4.4/5 overall
  • Owner rating4.4/5

    4.4 average across 3,172 owner ratings

  • Popularity3.7/5

    3,172 owner reviews, more than most models here

The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other dog and cat food, health, gear and grooming we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.

Overview

The S15 keeps things simple: an all stainless steel body sized at 74oz, or about 2.2 liters, in a compact 6.9 by 6.9 by 4.1 inch footprint. That size makes it easy to tuck into a corner of a kitchen or bathroom without taking up much counter space, though it means more frequent refills in homes with several cats.

HOOISE ships the fountain with 3 filters and 3 sponges, a generous starting supply that should carry most owners for a while before a replacement order is needed. The pump runs on 5 volts DC and is corded, built for continuous indoor operation.

What stands out most is demand: with about 3,172 ratings at a 4.4 star average and an estimated 6,000 units bought last month, the S15 ranks #9 in the Cat Fountains best-sellers list, putting it among the most actively purchased fountains in this category.

Pros

  • Ranks #9 in Cat Fountains, reflecting strong sales performance
  • All stainless steel construction
  • Ships with 3 filters and 3 sponges for extended use before restocking
  • Compact 6.9 x 6.9 x 4.1 inch footprint fits small spaces
  • 4.4 star average across roughly 3,172 ratings

Cons

  • 2.2 liter capacity is modest for multi-cat households
  • Corded electric only
  • Included filters will eventually need to be purchased separately once used up

Specifications

Breed size
Small
Weight
600 Grams

Performance notes

At 600 grams, the S15 is one of the lighter stainless steel fountains in this category, and its compact 6.9 inch footprint makes it easy to tuck into a small space. The 5-volt DC corded pump is built for continuous indoor use, and the bundled set of 3 filters and 3 sponges gives a decent supply before reordering is needed.

What buyers say

With about 3,172 ratings at a 4.4 star average and an estimated 6,000 units bought last month, this is one of the more actively purchased fountains in this category, backed by its #9 ranking in Cat Fountains.

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Frequently asked questions

How big is the HOOISE S15's water tank?

It holds 74oz, or about 2.2 liters, which suits one or two cats comfortably but may need more frequent refills in larger multi-cat homes.

How many filters come with it?

The fountain ships with 3 filters and 3 sponges, giving you enough supply to rotate through before needing to buy replacements.

Is it well reviewed?

Yes, it holds a 4.4 star average from roughly 3,172 ratings and ranks #9 in the Cat Fountains best-sellers list, suggesting consistent buyer satisfaction.

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