PetSafe HydroSphere 60 oz Cordless Fountain (Black) vs PetSafe Oasys 2 Gallon Dog Water Fountain
Should you favor HydroSphere's cordless placement options and 60 oz reservoir, or Oasys's 256 oz reservoir and plug-in setup?
Products compared
ASIN B0H12NK142
PetSafe HydroSphere 60 oz Cordless Fountain (Black)
You need the fountain away from an outlet and want the published rechargeable, motion-activated battery mode.
Last observed offer
$69.99
- Confirm offer eligibility on Amazon
Size: One Size
Price checked
Observed condition: new. Coupon and subscription requirements unverified.
ASIN B07D6SWF67
PetSafe Oasys 2 Gallon Dog Water Fountain
You want a 256 oz reservoir and have a suitable plug-in location.
Last observed offer
$75.99
- Confirm offer eligibility on Amazon
Size: 2 Gallon
Price checked
Observed condition: new. Coupon and subscription requirements unverified.
Prices are per listed package. Pickoryx may earn a commission from qualifying purchases through the paid Amazon links on this page, at no added cost to you.
Published by Pickoryx · Published 2026-10-18 · Source checked 2026-10-18 17:22 UTC
The main trade-off
HydroSphere trades reservoir capacity for a rechargeable motion-activated mode and more placement flexibility; Oasys trades battery placement for a 256 oz plug-in reservoir.
Quick verdict
Choose HydroSphere when cordless placement is useful and a 60 oz reservoir fits your refill routine; choose the exact 2-gallon Oasys when you want 256 oz and can use it at a plug-in location. The larger tank does not guarantee a particular number of days between refills, and no hands-on or comparative performance test was performed.
Choose PetSafe HydroSphere 60 oz Cordless Fountain (Black) if
- You need the fountain away from an outlet and want the published rechargeable, motion-activated battery mode.
- A 60 oz reservoir matches your household's planned refill and refresh routine.
Choose PetSafe Oasys 2 Gallon Dog Water Fountain if
- You want a 256 oz reservoir and have a suitable plug-in location.
- You prefer choosing on reservoir size rather than cordless placement.
When the recommendation changes
- The intended location has no practical outlet and the fountain must operate there on battery; that favors HydroSphere.
- A larger reservoir is the priority and the Oasys plug-in location works; that favors Oasys.
The differences that matter
| Decision point | PetSafe HydroSphere 60 oz Cordless Fountain (Black) | PetSafe Oasys 2 Gallon Dog Water Fountain |
|---|---|---|
| Reservoir Capacity And Refill Planning | 60 oz reservoir[3] | 2 gallons (256 oz) reservoir[2] |
What this changes: The Oasys holds 196 oz more water (about 4.27 times the stated volume), so it is the capacity-fit choice for households that prefer a larger reservoir. Capacity alone does not establish days between refills; pet consumption and regular refresh still matter.[1, 3, 2] The better fit depends on your priorities | ||
| Power And Placement Routine | Rechargeable cordless operation with motion-activated flow on battery, or continuous flow when plugged in[3] | Plug-in operation[2] |
What this changes: HydroSphere has a documented battery mode for placement away from an outlet and a plug-in continuous mode; the selected Oasys variant is plug-in. Choose according to the intended location and operating routine, not an assumption about measured performance.[1, 3, 2] The better fit depends on your priorities | ||
Best for your routine
Cordless placement away from a practical outlet
Best fit: PetSafe HydroSphere 60 oz Cordless Fountain (Black)
Based on listed features, not comparative testing.
The exact HydroSphere model documents rechargeable cordless operation with motion-activated flow on battery; the selected Oasys variant is plug-in.
Prioritize a larger reservoir while using a plug-in location
Best fit: PetSafe Oasys 2 Gallon Dog Water Fountain
Based on listed features, not comparative testing.
The exact Oasys variant holds 256 oz versus HydroSphere's 60 oz. This is a reservoir-capacity fit, not a promise of a particular refill interval.
Value and trade-offs
One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.
A higher current offer would need to be justified by the capacity or power-and-placement feature that matters to your setup; the relative value can change with current offers.
Current offer data do not establish a longer-term price pattern, so there is not enough history for a Buy Now or Wait recommendation.
Limitations
- Published capacity does not establish how many days either fountain will last; actual use varies and PetSafe recommends refreshing water regularly.
- The manufacturer pages describe features, not comparative real-world flow, battery life, durability, noise, cleaning effort, or pet preference; this comparison does not rank those outcomes.
- PetSafe confirms the manufacturer model numbers, but does not certify the retail listings' ASIN mappings.
- No hands-on testing was performed.
Questions shoppers ask
Does the Oasys 2-gallon model hold more than HydroSphere?
Yes. The selected Oasys model is specified at 256 oz, compared with HydroSphere's 60 oz. That volume difference does not by itself predict a refill interval.
Can HydroSphere run without being plugged in?
PetSafe describes rechargeable cordless operation with motion-activated flow on battery, as well as continuous flow when plugged in. The selected 2-gallon Oasys variant is plug-in.
Methodology and sources
Compared the exact HydroSphere PWW00-18313 page with the exact Oasys ZWW00-16558 2-gallon variant page, then used PetSafe's fountain chooser to interpret capacity and placement needs. The 256/60 ratio and 256−60 oz difference are arithmetic from the sourced capacities.
Research assistance organized manufacturer-published specifications into a conditional buyer comparison; it did not test the fountains.
View 3 sources
- 1.How To Choose the Best Pet Water Fountain for Your Cat or DogPetSafe · Official specifications · Source checked 2026-10-18 17:22 UTC
Evidence used on this page
- Capacity guidance; corded versus cordless placement; Oasys and HydroSphere product recommendations: PetSafe says reservoir size should fit the pets and household, with 60–70 oz for one cat or a small dog and 128 oz to several hundred ounces for larger or multi-pet homes; it still recommends regular water refresh. It describes corded fountains as continuous-running and rechargeable cordless fountains as more flexible for placement, and names Oasys at up to 256 oz and HydroSphere 60 oz Cordless for placement away from clutter. This is a line-level chooser, not an exact-SKU comparative test.
- 2.PetSafe Oasys Pet Fountain, 2 GallonPetSafe · Official specifications · Source checked 2026-10-18 17:22 UTC
Evidence used on this page
- Selected 2 Gallon / 256 oz variant, model ZWW00-16558; power specification: The exact-model variant page identifies ZWW00-16558 as the 2-gallon (256 oz) plug-in Oasys fountain. Use only this variant's specifications; other Oasys capacities are not substituted.
- 3.PetSafe HydroSphere 60 oz Cordless FountainPetSafe · Official specifications · Source checked 2026-10-18 17:22 UTC
Evidence used on this page
- Model PWW00-18313; 60 oz capacity; rechargeable battery and operating modes: The exact model page identifies PWW00-18313 and a 60 oz reservoir. It describes rechargeable cordless use with motion-activated flow while on battery, or continuous flow when plugged in.