Express Water Model 6 ROT600MBN Tankless Reverse Osmosis review
By Daryna Klochko · Published · Specs checked Oct 15, 2026 · 
Scores 8.75/10, tied for 17th of the 20 RO systems we track. At $394.99 it costs less than the category median of $459.99.
You need a certified health claim: none was found for it, unlike 12 of the 20 RO systems
- Price
- $394.99
- Certified for
- Brand claims only
- Flow
- 0.4 gpm
- Cartridge life
- Not stated
- Cost per year
- Not stated
- Warranty
- 1 year
Certification
Materials listing only: Express Water publishes its own test data; we found no certifier listing that covers reduction claims.
Express Water also claims Chlorine, Lead, PFOA/PFOS, TDS, Arsenic, Fluoride: brand claims, not in a certifier listing.
The contaminants or other substances removed or reduced by this water treatment device are not necessarily in your water. Listing checked on Oct 15, 2026. What a listing means and what it doesn't
Specs and sources
Checked Oct 15, 2026 · all from expresswater.comFiltration
Cartridges and install
Buying
Warranty, returns and shipping
Warranty: 1 year. Returns: 30 days. Shipping: not stated by the brand. Source: expresswater.com, checked Oct 15, 2026.
Source: expresswater.com, checked Oct 15, 2026.
Compared with similar RO systems
All 20 RO systems →| Model | Price | Certified for | Cost per year | Warranty | Score | Where to buy |
|---|---|---|---|---|---|---|
| SimPure T1-400ALK Tankless RO with Remineralization | $349.99 | Brand claims only | $180 | 1 year | 9/10 | Check price → |
| Express Water Model 6 ROT600MBN Tankless Reverse OsmosisTHIS MODEL | $394.99 | Brand claims only | — | 1 year | 8.75/10 | Check price → |
| AquaTru Under Sink Reverse Osmosis | $395 | Lead · Cysts +9 | $130 | 1 year | 9.75/10 | Check price → |
| Aquasana SmartFlow Reverse Osmosis | $449.99 | Lead · Cysts +9 | $310 | 2 years | 9.25/10 | Check price → |
| Brondell Circle RC100 Reverse Osmosis | $449.99 | Lead · Cysts +12 | $205 | 1 year limited | 9.75/10 | Check price → |
What owners say
Checked Oct 15, 20262.6/5 from 32 ratings on Amazon. In our score this is 1.75 of 2 points. How we score
- Effectiveness11 mentions7 positive4 negative
- Installation9 mentions7 positive2 negative
- Filter availability9 mentions0 positive9 negative
Store ratings change over time; the date shows when we checked.