Look at the material (stainless steel or lead‑free brass) for corrosion resistance, the type of filtration (integrated RO, carbon block, or none), and whether the unit includes hot‑water capability. Also consider installation needs such as hole size, connector dimensions, and whether the faucet is DIY‑friendly. Finally, assess flow rate and spout design, as they affect ease of use and water waste.

The Waterdrop model is a dedicated reverse‑osmosis faucet that connects directly to a PE pipe and provides only cold, filtered water, while the APPASO 3‑in‑1 combines hot and cold taps with an optional RO line and a built‑in filter for everyday use. APPASO also offers a pull‑down sprayer and a single‑lever handle, giving more versatility for cooking and cleaning. The Waterdrop’s ceramic disc and triple O‑ring seals focus on leak‑free performance, whereas APPASO emphasizes a multi‑function design with a ceramic valve rated for 500,000 cycles.

The InSinkErator HOT250 system provides near‑boiling hot water on demand and includes a stainless‑steel tank, while the Westbrass Velosah kit offers an instant‑hot dispenser that requires a separate heating tank. Hot‑water models generally need a power source and may have higher installation complexity, but they save time and reduce energy compared to boiling water on the stove. Keep in mind that hot‑water units often lack built‑in filtration, so you may need an additional filter if you want cold drinking water.

Yes, several models such as the Kraus Purita, InSinkErator HOT250, and Westbrass Touch‑Flo are sold without an included filter, meaning you’ll need to purchase a compatible filtration system separately. This adds to the initial expense but lets you choose a filter level that matches your water quality needs. In contrast, the APPASO and Waterdrop faucets come with integrated filtration, simplifying the purchase but often at a higher base price.

Finish influences both visual appeal and resistance to fingerprints, water spots, and corrosion; matte black and brushed nickel tend to hide smudges better than polished stainless steel. All listed faucets use corrosion‑resistant materials like 304 stainless or lead‑free brass, so durability is comparable across finishes. Choose a finish that matches your cabinet style and personal preference, keeping in mind that darker finishes can add a modern accent to a traditional kitchen.

Most models need a single 1‑inch hole, but some (like the Waterdrop and WEWE faucets) provide quick‑connect adapters for 1/4" or 3/8" PE tubing to suit various under‑sink setups. The APPASO and Kraus units include mounting hardware and are marketed as DIY‑friendly, while the InSinkErator HOT250 requires an additional power outlet and a 1 3/8‑inch faucet hole. Always verify that your sink’s existing plumbing can accommodate the connector sizes and that you have enough clearance for any tank or filter components.

Higher flow rates, such as the Waterdrop’s 1.63 GPM, make filling pots quicker but can increase water waste if not controlled; low‑flow models like the Kraus (1.0 GPM) conserve water while still delivering a strong stream. Spout features like 360‑degree swivel, high‑arc reach, or a 24‑inch pull‑down hose affect how easily you can access all areas of the sink. Choose a spout that matches your sink depth and the tasks you perform most often, whether it’s rinsing dishes or filling tall containers.

The Westbrass Touch‑Flo 6‑inch pure water dispenser combines a compact matte‑black design with touch‑activated dispensing, making it ideal for tight spaces. The APPASO 3‑in‑1 black faucet also saves space by integrating hot, cold, and filtered water into a single pull‑down unit, though it requires a separate filter. Both provide strong functionality without a bulky separate dispenser, delivering good performance at a reasonable price point.