Which Drinking Water Filter Should You Choose? Tank RO vs. Tankless (Direct Flow)

Choosing the right water filtration system is an investment in your health and everyday comfort. Reverse osmosis (RO) filters are among the most effective, removing even the smallest impurities, microplastics, heavy metals, chlorine, bacteria, and more.

But which one should you choose – a classic system with a tank or a modern, tankless direct flow model?

Below is a comparison of both options, with pros, cons, pricing, and recommended products from our store.

🔵 Tank-Based Reverse Osmosis System

This is the classic version where filtered water is stored in a pressure tank, ready to use immediately. Tanks typically hold 5–6 liters, perfect for filling a kettle or jug without waiting.

✅ Pros:

• Water is always available – ideal for families.

• Lower initial cost – budget-friendly.

• Proven technology – reliable and widely used.

❌ Cons:

• Takes up more space under the sink.

• Risk of bacterial growth in the tank – requires regular maintenance.

• Lower pressure during high usage.

• Filter replacement is time-consuming – 5–7 filters, up to 1.5 hours to change.

💰 Price range: 299 to 399 EUR

👉 7-Stage Pumped Reverse Osmosis Water Filter – 299 EUR
👉 Platinum Wasser Ultra6 RO Booster – 375 EUR

🔴 Tankless (Direct Flow) Reverse Osmosis System

A modern solution that filters water on demand, without storage. It’s compact, fast, and fits beautifully in modern kitchens.

✅ Pros:

• Saves space – no tank under the sink.

• Fresh water always available – filtered instantly.

• Higher pressure and flow – up to 1.5–2 L/min.

• Filter replacement takes just 2–3 minutes once a year – typically 2 or 3 multi-stage cartridges.
  As easy as changing ink in a printer – clean and tool-free.

❌ Cons:

• Higher upfront cost.

• Requires stable water pressure (min. 1.5–3 bar).

💰 Price range: 599 to 1150 EUR

👉 Xpert Premium ECO Filter – 599 EUR
👉 iWater Premium ECO Filter – 999 EUR

⚖️ Quick Comparison