Waterdrop G3P600 Review 2026
The Waterdrop G3P600 is one of the best tankless RO systems for households that want under-sink space back. Listed by IAPMO R&T under NSF/ANSI 58, 53, 42 and 372, which covers fluoride, lead and PFOA/PFOS reduction among other claims. The 2:1 pure-to-drain ratio and 600 GPD output put it well ahead of traditional tank systems on efficiency. The smart faucet with TDS display is a genuine differentiator. Main trade-offs: higher upfront cost than the APEC ROES-50 and no remineralization. For households that value space-saving and water efficiency over lowest upfront cost, it's a strong choice.
Before you buy: check that the Amazon listing title includes G3P600.
Get it if You refill jugs or bottles often and want RO without a storage tank.
Skip it if There is no outlet under the sink, or you want remineralized water out of the box.
- Tankless - saves space
- 600 GPD against 50 GPD on the APEC ROES-50
- TDS display confirms filtration
- Higher cost (Premium tier)
- Requires electricity
- No remineralization
Before you buy: check that the Amazon listing title includes G3P600.
See the Waterdrop G3P600 on Amazon (paid link) Buy direct from Waterdrop ↗ (paid link)Certification - what the listings say
We read the G3P600's listings in the IAPMO R&T directory (files WC-13976, WC-14805, WC-14301 and WC-13977, checked 3 October 2026). NSF/ANSI 58, the reverse osmosis standard, lists TDS, fluoride, cadmium, barium, radium 226/228 and lead. NSF/ANSI 53 lists PFOA and PFOS. NSF/ANSI 42 covers chlorine taste and odor, and NSF/ANSI 372 covers lead-free materials. Waterdrop also cites SGS lab testing for arsenic, chromium and more; that is the maker's own testing, not part of any certification, so we leave it out of the comparison.
Performance - tankless vs traditional RO
The G3P600's primary advantage over systems like the APEC ROES-50 is its tankless design. Traditional RO systems store filtered water in a 3-4 gallon pressurized tank - taking up significant under-sink space and requiring refill time after heavy use. The G3P600 filters on demand, driven by a pump, delivering 600 GPD. No waiting, no tank, more cabinet space. For the G3P600 next to the G3P800, iSpring RO500 and X8, see our best tankless reverse osmosis systems.
The 2:1 pure-to-drain ratio means for every 2 gallons purified, 1 gallon goes to drain - significantly more efficient than traditional tank systems which typically run 3:1 or worse. For a family drinking roughly a gallon a day, that difference adds up to meaningfully less wasted water per year compared with a traditional system.
Smart faucet - TDS display
The included LED smart faucet displays real-time TDS levels and filter life. TDS (total dissolved solids) is a proxy measure for overall filtration effectiveness - lower TDS means more contaminants removed. The filter life indicator tells you when to replace without guessing. This is a useful feature missing from most competitor systems including the APEC ROES-50. Filter replacement takes seconds with a twist - no tools, no turning off the water supply.
G3P600 vs APEC ROES-50 - which to choose
| Feature | Waterdrop G3P600 | APEC ROES-50 |
|---|---|---|
| Price tier | Premium | Budget |
| NSF/ANSI listings | 58, 53, 42, 372 | 58 (TDS only) |
| Tank | Tankless | 3.2 gal tank |
| Capacity | 600 GPD | 50 GPD |
| Drain ratio | 2:1 | Not published |
| Smart faucet | TDS display | Basic faucet |
| Remineralization | No | No |
| Running cost | Mid | Low |
| Country | China (US sold) | USA assembled |
Choose APEC ROES-50 if: budget is the priority, you don't mind the under-sink tank, and lowest annual running cost matters. It is one of the cheapest RO systems with a current NSF/ANSI 58 listing, though that listing covers TDS only.
Choose Waterdrop G3P600 if: under-sink space is limited, you want faster flow, the 2:1 water efficiency matters, and you want a smart faucet with TDS monitoring built in.
The full side-by-side, with both registry records and the yearly filter cost at each maker's prices, is in APEC ROES-50 vs Waterdrop G3P600.
Installation
The G3P600 requires drilling two holes - one for the RO faucet (1 inch) and one for the drain connection. This is standard for under-sink RO systems. Total installation time is approximately 30-45 minutes with basic plumbing comfort. One notable requirement: the G3P600 needs electrical power under the sink to run its pump - most under-sink cabinets have an outlet, but verify before ordering. The APEC ROES-50 does not require electricity.