Look for dispensers with at least 8‑10 L (2‑2.5 gal) capacity to reduce refill frequency. Models like the Heouvo 2.5 gal (9.5 L) and Sfozstra 9 L provide enough water for several days of use. If you have very active dogs or plan to be away, a higher‑capacity unit such as the Gardner Pet 8.5 L will give extra peace of mind.

Stainless steel bowls are the most hygienic because they resist bacteria, odors, and staining, and many models (Heouvo, Sfozstra, Gardner) feature food‑grade 304 steel. Plastic bowls are lighter and cheaper but can retain odors over time. If you prioritize easy cleaning and durability, choose a dispenser with a removable stainless steel bowl.

A secure sealing ring or lock‑in mechanism prevents drips when the bottle is positioned correctly; the Heouvo and RIZZARI models highlight leak‑proof seals. Raised rims, non‑slip bases, and weighted designs (Sfozstra, RIZZARI) further reduce spills caused by active pets. Check product images or reviews for any reports of leaks before purchasing.

Most gravity dispensers feature wide‑mouth openings and split designs that let you disassemble the bowl, bottle, and base for thorough rinsing. The Heouvo, RIZZARI, and Staltwo units specifically mention dishwasher‑safe stainless steel bowls and simple hand‑wash steps. No special brushes or chemicals are needed; a quick weekly rinse is usually sufficient.

The RIZZARI 7 L model includes an upgraded, washable filter cartridge that helps keep water clear and fresh, which can be beneficial in hot climates or for pets sensitive to taste. Most other models rely on gravity alone without a filter, which works fine if you change water regularly. If you prefer added water purity, the filtered option may justify a slightly higher price.

Value combines capacity, material quality, and ease of maintenance. The Heouvo 9.5 L unit provides a large reservoir, stainless steel bowl, and leak‑proof design at a moderate price point, making it a strong all‑round choice. For tighter budgets, the Amazon Basics 1‑gallon model is inexpensive but offers less capacity and a plastic bowl.

Outdoor‑ready models typically have sturdy, non‑tip bases and weather‑resistant materials; the Petmate Big Blue outdoor bowl is designed for patio use but requires a separate 5‑gallon jug. Gravity dispensers like Heouvo and Gardner are portable and work without electricity, making them suitable for trips, but ensure the base is stable on uneven surfaces.

Tower designs (RIZZARI, Gardner) save floor space and make water level monitoring easy through a transparent column, while low‑profile units (Petmate Aspen, Amazon Basics) fit under cabinets or in tight corners. If you have limited floor area or want a sleek look, a tower may be preferable; for simplicity and easy access for short‑legged pets, a low‑profile bowl works well.