Extra-large hydration capacity for big dogs and multi-pet households.
The DeftPet 21L Stainless Steel Dog Water Fountain holds up to 5.55 gallons of water, giving large dogs and multi-pet households a generous shared water supply with fewer refill interruptions.
Its wide stainless steel drinking surface provides plenty of room for multiple pets, while multi-layer filtration helps capture hair and everyday debris. A visible water-level window with color indicators makes it easy to know when the fountain is ready to use and when it needs more water.
The low-noise pump is designed for comfortable indoor use, while the included waterproof mat helps catch everyday splashes and drips around the fountain.
Best for: large dogs, multiple large dogs, multi-pet households, and homes with high daily water demand.
Setup & Placement
Follow the included User Guide to assemble the water pump, filtration components, and stainless steel faucet.
Place the fountain on a flat, stable surface. Use the included waterproof silicone mat underneath to help catch splashes and drips.
Daily Use
Fill the fountain with clean water according to the User Guide before connecting the power adapter.
Check the LED water-level indicator regularly and refill when needed. Keep sufficient water in the fountain to support proper pump operation.
Cleaning & Maintenance
Disconnect the power before cleaning.
Clean the stainless steel drinking tray, water pump, and filtration components regularly according to the User Guide.
Inspect the pump and replace filters as recommended to help maintain proper water circulation.
Important Notes
Actual refill frequency depends on the number of pets and their daily water consumption.
Pump noise may vary depending on water level, placement, and maintenance.
This is the standard fountain model. The DeftPet adjustable elevated stand is not compatible with the 21L fountain.
Shipping
We currently ship to eligible addresses within the United States. Free standard shipping is available on eligible U.S. orders when displayed at checkout.
Available shipping options, any applicable charges, and estimated delivery dates will be displayed during checkout.
Once your order ships, tracking information will be emailed to you when available.
Returns & Refunds
DeftPet offers a 30-day return policy from the date of delivery.
Eligible returns include free return shipping, with no restocking fees.
To request a return, please contact service@deftpet.com with your order number. Our support team will provide return instructions.
Once a return is received and approved, the refund will be issued to the original payment method.
For more information, please review our Shipping & Delivery and Returns & Refunds policies.
A 21L / 5.55 Gal stainless steel pet water fountain designed for large dogs, multiple large dogs, and busy multi-pet households that need more water available between refills.
21L / 5.55 Gal Capacity
304 Stainless Steel
Multi-Layer Filtration
Built for High-Demand Hydration
More water. More room to share. Less time spent refilling.
Made for Bigger Packs
Designed for large dogs and multi-pet homes.
304 Stainless Steel
Durable tank and drinking surface.
Smart Water-Level Alert
Know at a glance when it’s time to refill.
3 Filters Included
Continuous Water. Multi-Layer Filtration.
Water circulates continuously through the filtration system to help capture pet hair and everyday debris before returning to the drinking surface.
Find the Right Size for Your Pack
Compare DeftPet stainless steel fountains and choose the capacity that fits your pets and daily routine.
The 21L / 5.55 Gal model is designed for large dogs, multiple large dogs, and multi-pet households with higher daily water demand.
It holds up to 21 liters / 5.55 gallons of water.
The 21L fountain measures approximately 17" L × 13.1" W × 9.6" H, including the faucet. The water tank body is approximately 6.69" tall.
The 21L fountain features a low-noise circulating pump designed for everyday indoor use. Actual noise levels may vary depending on water level, pump maintenance, and placement.
Blue indicates a normal water level, while red reminds you that it is time to refill.
We recommend replacing the main water fountain filter approximately every 1–3 weeks, depending on the number of pets, water quality, and daily use.
Inspect the filter regularly and replace it sooner if it becomes visibly dirty, clogged, or affects water circulation.
More frequent replacement may be needed in multi-pet households or environments with heavier pet hair and debris.
Weekly cleaning is recommended.
No. The DeftPet adjustable stand is not compatible with the 21L fountain. It is designed for select 12L, 15L, and 18L models.
