Cat water fountains · Choose by your needs
For a 5 L minimum, separate models rated at 5 L from larger reservoirs: Catit PIXI UV-C #43761 adds rechargeable sensor or timed flow, while PETKIT EverSweet Ultra is a plugged-in camera-tracking system whose separate 1.8 L waste tank is not drinking capacity. Larger matches include an 8 L fountain with only a short outage reserve, a nominal two-gallon open bowl, and a 9.5 L gravity station. Capacity is not a refill schedule.
Comparison updated 29 October 2026.
| Model | Exact model and drinking capacity | Operating plan | Choice-limiting detail |
|---|---|---|---|
| Catit PIXI Stainless Steel UV-C Fountain 43761 | Catit PIXI Stainless Steel UV-C #43761 · 5 L | Rechargeable sensor or 12-second timed bursts; continuous only when plugged in | Supplied UVC; compatible continuous-flow adapter not included. |
| PETKIT EverSweet Ultra EverSweet Ultra P4117 | PETKIT EverSweet Ultra P4117 · 5 L clean-water supply | Plugged-in fountain with app, dual-band Wi-Fi and camera profiles | Separate 1.8 L waste tank is not additional drinking capacity. |
| PETLIBRO Capsule Dog Fountain 2.1 gal PLWF008 (2.1 US gal / 8 L) | PETLIBRO Capsule Dog PLWF008 · 8 L nominal | Continuous outlet circulation; integrated battery is an outage reserve | Plastic, tall body; up to 16 hours of reserve is not a long-term off-grid plan. |
| PetSafe Oasys 256 oz ZWW00-16558 256 oz | PetSafe Oasys 256 oz ZWW00-16558 · about 7.57 L nominal | Plug-in pump and adjustable falling stream over an open plastic bowl | Below an 8 L minimum; nominal capacity is not measured usable fill. |
| PetSafe Healthy Pet Water Station Large (2.5 gal) PFD17-11856 | PetSafe Healthy Pet Water Station Large · 2.5 gal, rounded to 9.5 L | No plug or pump; gravity feeds a removable steel bowl | Largest tank is a two-hand lift-and-lock refill, not circulating water. |
Choose it when: The exact #43761 manual specifies a 5 L tank and separate rechargeable sensor/timed plans, with continuous flow reserved for the plugged-in plan.
The limit: The up-to-45-day maker claim is for timed mode, not a general use estimate. The compatible USB-A adapter is not supplied, and the wet assembly still needs regular cleaning.
Choose it when: The exact P4117 record distinguishes the 5 L clean-water reservoir from its separate waste tank and documents direct dual-band connectivity with camera profiles.
The limit: First-use app pairing is required; full video playback and highlights have a PETKIT Care+ condition. The camera profile limit is not a promise of identification accuracy.
Choose it when: The exact PLWF008 manual specifies an 8 L reservoir and continuous whirlpool. Its operating record also documents a separate integrated battery reserve for temporary outages.
The limit: The maker says up to 16 hours during an outage and notes that runtime varies. It is a powered plastic fountain, not a gravity station or a multi-day rechargeable model.
Choose it when: The exact two-gallon Oasys configuration is listed at 256 U.S. fl oz, approximately 7.57 L, and the guide documents its continuous outlet pump and open bowl.
The limit: It does not meet an 8 L minimum. Keep the open bowl above the pump's minimum water level; its nominal label does not promise a refill interval or battery backup.
Choose it when: The exact Large station lists a 2.5-gallon plastic reservoir rounded by PetSafe to 9.5 L, with gravity replenishment into its removable stainless bowl.
The limit: It meets a high capacity threshold without electricity but does not circulate water. Fill, invert and lock the tank as directed, and keep checking and cleaning the bowl.
The 5 L choices include the Catit #43761 and PETKIT Ultra. At a 7.5 L minimum the nominal two-gallon Oasys still qualifies at about 7.57 L; a 7.6 L request excludes it. At 8 L the Capsule Dog and the Large gravity station meet the threshold; above 8 L the Large is the only documented option. Its rounded 9.5 L size meets a 9.5 L request, but a 9.6 or 10 L minimum has no documented match. Use the separate capacity answers for the exact 8 L, 9.5 L and 10 L decisions.
The 8 L Capsule Dog circulates on its adapter, with a short integrated battery reserve described for power outages. The 9.5 L Water Station has no pump and refills a still bowl by gravity. PETKIT Ultra's clean-water supply is 5 L; its separate 1.8 L waste tank must not be added to drinking capacity. Choose the system that fits the location and care routine, not just the largest printed number.
Nominal reservoir capacity is not usable fill volume or a guarantee of days between refills. Monitor water, follow each manual's minimum water line and clean the pump, bowl and filters as specified. A backup reserve or gravity tank does not remove those checks.
No. The exact product record separates a 5 L clean-water supply from a 1.8 L waste tank. Waste storage is not additional water for the cat to drink.
No. Its maker describes up to 16 hours of battery reserve during an outage and says runtime varies. The primary setup is a continuous outlet-powered fountain.
No. It uses gravity to replenish a removable bowl; there is no electrical pump or circulating stream.
None in the documented operating-plan set. The largest confirmed reservoir in this answer is the Water Station Large at a rounded 9.5 L. Lowering the threshold to 9.5 L is an explicit alternative; it does not make the capacity equivalent to 10 L.
