Delta Clarifi Tankless RO
#3 in TanklessFull review
For a household that wants a broadly certified tankless system with low running costs and a long warranty. Budget buyers can get similar output for less.
Amazon $799$799
The Delta Clarifi Tankless RO is the better under-sink reverse osmosis system overall, rated 3.7 to 3.0. The Delta Clarifi Tankless RO leads on certification and warranty. The Philips AUT9360 wins on price. The Philips AUT9360 costs $449.02 less ($349.98 vs $799).
Philips AUT9360
#13 in TanklessFull review
For a buyer who wants a two-filter tankless system with a longer warranty and lower water waste, and can live without NSF 58 certification.
Amazon $349.98$349.98
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Delta Clarifi Tankless RO for certification (certified to NSF/ANSI 58 vs no third-party certification) and warranty (5-year warranty vs 2-year warranty).
- Choose the Philips AUT9360 for price ($349.98 vs $799).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every tankless under-sink reverse osmosis system; a clear win is highlighted. How we rank explains each one.
| Factor weight | Delta Clarifi Tankless RO | Philips AUT9360 |
|---|---|---|
| Overall rating | 3.7/5 | 3.0/5 |
| Certification 25% | 100 certified to NSF/ANSI 58 | 0 no third-party certification |
| Filter cost 20% | 13 $201 a year in replacement filters | 50 filter cost not published (neutral score used) |
| Water wasted 15% | 95 2:1 pure to drain | 97 2.3:1 pure to drain |
| Output 10% | 43 600 gallons a day | 43 600 gallons a day |
| Price 15% | 9 $799 | 74 $349.98 |
| Warranty 15% | 100 5-year warranty | 25 2-year warranty |
Specifications
| Delta Clarifi Tankless RO | Philips AUT9360 | |
|---|---|---|
| Filtration | ||
| Output | 600 gallons a day | 600 gallons a day |
| Pure to drain | 2:1 | 2.3:1 |
| Stages | 6 | - |
| Remineralization | No | No |
| NSF/ANSI 58 | Yes | No |
| Other certifications | NSF/ANSI 42, 53, 244, 372, 401 | - |
| Replacement filters | $201 a year | - |
| Build | ||
| Tank | Tankless | Tankless |
| Booster pump | - | Yes |
| Warranty | 5 years | 2 years |
| Released | 2024 | - |