Waterdrop G2P600
#7 in TanklessFull review
For a buyer who wants tankless RO at a low price and low running cost and can do without third-party performance certification.
Amazon $299$299
3.2/5
For a buyer who wants the broadest certification in a fast tankless system and doesn’t mind the price. Most households get similar output for much less elsewhere.
- 800 gallons a dayOutput
- 1.8:1Pure to drain
- $350 a yearFilters
- YesNSF/ANSI 58
Check price at Amazon$1,299.99
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Certified to NSF/ANSI 58 and four other standards
- Less than one gallon goes down the drain per gallon made
- 800 gallons a day fills a glass in seconds
- Detects leaks and flushes itself
Cons
- Costs about $1,300, far more than other tankless systems
- Filters cost about $350 a year
- Needs an outlet under the sink
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | AQ-HSRO800 |
|---|---|
| Filtration | |
| Output | 800 gallons a day |
| Pure to drain | 1.8:1 |
| Stages | 2 |
| Remineralization | No |
| NSF/ANSI 58 | Yes |
| Other certifications | NSF/ANSI 42, 53, 372, 401 |
| Replacement filters | $350 a year |
| Build | |
| Tank | Tankless |
| Smart faucet | No |
| Warranty | 2 years |
Alternatives in this type
A. O. Smith AOS-DFRO800
#8 in TanklessFull review
For a household that wants fast, certified tankless RO for less than most rivals. Buyers without a spare faucet should get the brushed nickel version.
Amazon $449.99 Amazon $484.99$449.99
iSpring RO500AK
#10 in TanklessFull review
For buyers who want a certified tankless system with remineralization and fast flow. Running costs are high, so it suits households that value the certification over cheap filters.
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