Waterdrop G3P800 vs Waterdrop G5P700A

Last updated: November 2, 2026

The Waterdrop G5P700A is the better under-sink reverse osmosis system overall, rated 3.8 to 3.4. The Waterdrop G5P700A leads on price and filter cost. The Waterdrop G3P800 wins on output. The Waterdrop G5P700A costs $539.01 less ($309.99 vs $849).

Waterdrop G3P800 vs Waterdrop G5P700A

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?

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 weightWaterdrop G5P700AWaterdrop G3P800
Overall rating3.8/53.4/5
Certification 25%100 certified to NSF/ANSI 58100 certified to NSF/ANSI 58
Filter cost 20%41 $130 a year in replacement filters28 $160 a year in replacement filters
Water wasted 15%95 2:1 pure to drain100 3:1 pure to drain
Output 10%57 700 gallons a day71 800 gallons a day
Price 15%83 $309.995 $849
Warranty 15%0 1-year warranty0 1-year warranty

Independent measurements

Waterdrop G5P700A

No independent test published yet.

Waterdrop G3P800

Tested byTDS reductionOutputPure to drainConditions
Water Filter Guru95.5 %886.5 gpd2.2 :1Tap Score lab: 776 ppm feed to 35 ppm output without remineralization (95.49%). Flow from a 12 oz fill timed at 9.14 s (0.62 gpm) with 58.3 F feed water. Ratio from a 64 oz draw (29 oz to drain); a 12 oz draw measured 1.5:1. Date is the review update date.

Specifications

Waterdrop G5P700AWaterdrop G3P800
Filtration
Output700 gallons a day800 gallons a day
Pure to drain2:13:1
Stages810
RemineralizationYesNo
NSF/ANSI 58YesYes
Other certificationsNSF/ANSI 372NSF/ANSI 42, 53
Replacement filters$130 a year$160 a year
Build
TankTanklessTankless
Booster pumpYesYes
Smart faucetYesYes
Warranty1 year1 year

All under-sink reverse osmosis system comparisons →