Tankless RO systems filter on demand instead of storing water in a pressure tank. They're smaller, fill a glass faster and usually waste less water. The trade-off is that they need an outlet under the sink and cost more.
- Best overallWaterdrop G3P800$999 list
- Best valueWaterdrop G3P600About $439
Side by side
| Model | Price | Type | Gallons per day | Pure to drain | Certified to | Power | Filters per year | Warranty |
|---|---|---|---|---|---|---|---|---|
| Waterdrop G3P800 | $999 list | Tankless | 800 | 3:1 | NSF/ANSI 42, 53, 58, 372 | Needs an outlet | About $160 | 1 year |
| Waterdrop G3P600 | About $439 | Tankless | 600 | 2:1 | NSF/ANSI 42, 53, 58, 372 | Needs an outlet | About $145 | 1 year |
No. 1Best overall
Waterdrop G3P800
- Price
- $999 list
- Type
- Tankless
- Gallons per day
- 800
- Pure to drain
- 3:1
- Certified to
- NSF/ANSI 42, 53, 58, 372
- Power
- Needs an outlet
800 GPD, a 3:1 ratio, UV and a smart faucet showing water quality and filter life. Certified to NSF/ANSI 42, 53, 58 and 372. About $160 a year in filters.
What we like
- Best ratio here
- UV and smart faucet
What to know
- $999 list
- 1-year warranty
No. 2Best value
Waterdrop G3P600
- Price
- About $439
- Type
- Tankless
- Gallons per day
- 600
- Pure to drain
- 2:1
- Certified to
- NSF/ANSI 42, 53, 58, 372
- Power
- Needs an outlet
600 GPD and a 2:1 ratio with the same certifications, for about $439. Filters run about $145 a year.
What we like
- About $439
- Same certifications
What to know
- No UV or smart faucet
Questions
Do tankless RO systems need electricity?
These do. They use a pump to push water through the membrane, so you need an outlet under the sink.
Is tankless better than a tank?
Faster and smaller, with less waste. Tank systems are cheaper and work without power. See our comparison.
