Waterdrop G3P600 review
Waterdrop G3P600 Tankless Reverse Osmosis System (600 GPD)
By Tom Calder
The smaller sibling of the G3P800 with the same certified claims (lead and fluoride under NSF/ANSI 58, PFOA and PFOS under 53, via IAPMO R&T). It makes 600 GPD at 2:1, so it sends a little more water to the drain.
- Best for
- The same certified claims for a smaller household
- Skip it if
- You have no outlet under the sink
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.We earn a commission if you buy through the retailer links on this page. It doesn't change our verdict. How we make money →
Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- Same certified claims as the G3P800
- Tankless
- Same footprint as the G3P800 (18.11 x 5.67 x 17.73 in)
Worth knowing
- 2:1 pure to drain
- Needs an outlet
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Who shouldn't buy this
Don't buy it if you have no outlet under the sink: APEC's tank systems run without power.
Key specs
| Type | Tankless under-sink, 8 stages |
| Rated output (maker) | 600 GPD |
| Pure to drain (maker) | 2:1 |
| Needs power | Yes |
| Certification (certifier's listing) | IAPMO R&T: NSF/ANSI 58 (incl. lead, fluoride, TDS), 53 (PFOA/PFOS), 42, 372 |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the US price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for Certified for lead and PFOA/PFOS in one tankless system
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Best for A cheaper tankless RO with a mineral stage
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Best for A compact tankless RO from Frizzlife's own store