PetSafe Oasys 2 Gallon Pet Fountain: problems, parts and running costs
Checked: 2026-10-19
Summary
This 256 oz plug-in fountain for large dogs and multi-pet homes has almost no public failure evidence — no independent instrumented test and no owner threads were found for this exact model — so the practical risks are the model-code confusion and the hand-washing, since only the bowl is dishwasher safe. Running cost cannot be computed: PetSafe publishes no filter price or replacement interval, and only a 45-day return window is listed. At $44.99 (PetSafe, 2026-10) it is priced for its capacity, and replacement carbon filters, foam filters and the pump are sold through PetSafe’s Drinkwell parts channel.
Common problems and fixes
- Wrong-size delivery risk — PetSafe’s own site lists PWW00-16790 as the 64 oz (1/2 gallon) variant and ZWW00-16558 as the 256 oz (2 gallon) one, conflicting with listings that call PWW00-16790 the 2 gallon model; the fix is to match the model code to the capacity before ordering. [1][2]
- Same price on all three capacities — the manufacturer page shows $44.99 for the 64 oz, 128 oz and 256 oz variants alike, which looks like a display error; confirm the capacity and price at checkout. [1][2]
- Pump is hand-wash only — only the bowl is top-rack dishwasher safe; the pump has to be washed separately by hand each cleaning. [1][2]
Parts and consumables
- Drinkwell replacement pump — same parts channel; this is also the part that must be hand-washed during cleaning. [1][2]
Yearly running cost
Not enough data. PetSafe does not publish filter or pump prices or a replacement interval, and no owner-reported costs were found, so a yearly figure cannot be computed. What recurs in ownership: Drinkwell carbon filters, Drinkwell foam filters and a Drinkwell replacement pump, all sold through PetSafe’s parts channel. [1][2]
When it is a good buy
PetSafe.com lists the 256 oz (2 gallon) fountain at $44.99 (2026-10), and the same $44.99 appears on all three capacity sizes, so confirm you are charged for the 256 oz variant at checkout. [1][2] At that price it is priced for its capacity, and the Drinkwell parts channel should keep filters and a pump available long term. [2] No alternatives to compare against were found in the research inputs.