Viomi V6 PRO vs Waterdrop G5P700A: Moderate Daily Use or a Higher Rated Output

Households with moderate daily water use, where purified water mostly fills glasses, bottles, a coffee maker and the occasional pot, are well served by a 600 GPD system, and the Viomi V6 PRO is a good choice for them, pairing that rating with a faucet and app that keep TDS and filter life in view.

The Waterdrop G5P700A, compared here as the standard unit WD-G5P700A, is rated higher, at 700 GPD, and builds an alkaline mineralization layer into its pre-filter. Kitchens that draw a lot of water through the day, or that want mineral-added water from the RO faucet, get both of those in one tankless unit.

Rated Output: 600 GPD and 700 GPD

Both numbers are membrane ratings published by each brand, and the G5P700A carries the higher one. Waterdrop's manual gives its 700 GPD figure at 30 psi dynamic feed pressure and 77°F water temperature. The Viomi V6 PRO is rated at 600 GPD from its RO600 membrane.

A rating is most useful as a sizing guide. Neither system stores water in a tank, so each one purifies water while the faucet is open, and the rating describes how much the membrane is built to produce over a day under set conditions. A household whose purified water goes mainly to drinking, coffee and everyday cooking sits comfortably within a 600 GPD rating, and that same household benefits from the Viomi V6 PRO's 3:1 pure-to-drain ratio every day the system runs. The extra 100 GPD on the G5P700A gives more headroom to kitchens where the RO faucet runs for long stretches, such as filling several large pots for batch cooking or topping up multiple bottles in a row.

Our guide to sizing a home RO system for peak use shows how to estimate a household's busiest half hour, which is a better basis for choosing between these two ratings than headcount alone.

Household Needs Matched to Each System

For heavy users, the 700 GPD rating is the main draw of the G5P700A. For households that want fewer cartridge swaps and a smaller rated drain share, the Viomi V6 PRO's 12-month pre-filter and 3:1 ratio are the figures that matter.

On the ratio row, every RO system sends some incoming water to the drain to carry away what the membrane holds back, and the pure-to-drain ratio is each brand's nominal figure for that split. At 3:1, about one quarter of the water entering the Viomi V6 PRO is rated to go to the drain; at 2:1, about one third of the water entering the G5P700A. Per gallon of purified water, that is about a third of a gallon to the drain for the Viomi V6 PRO and about half a gallon for the G5P700A.

Following TDS and Filter Life Day to Day

Both systems put a display on the faucet, so the basic habit of glancing at a number while filling a glass works on either one.

The Viomi V6 PRO faucet shows real-time TDS and filter life at a glance. Under the sink, orange lights on the control panel come on 10 to 15 days before a filter is due, and the Viomi app brings the same status to the phone: TDS before and after filtration, a water usage report, the remaining life of each filter and a replacement reminder. Filter life appears in each of those places, as a figure on the faucet, an orange alert on the panel and a countdown in the app. The usage report adds a longer view, showing how much purified water the household draws and how that use changes over time.

The G5P700A's smart faucet shows TDS along with the life of the CF and RO filters. Its screen wakes when the faucet opens and switches off once the water stops, and the main unit has its own CF and RO life lights.

Cartridges Over the First Two Years

Each system runs on two cartridges, and the mineral stage on the G5P700A does not add a third. Waterdrop places the alkaline mineralization layer inside the G5P700A-CF filter, next to its pre-sediment and post-carbon stages, so the mineral layer is renewed every time the CF filter is changed. That filter is rated for 6 months, and the G5P700-RO membrane for 24 months.

On the Viomi V6 PRO, the PCB composite filter is rated for 12 months and the RO600 membrane for 24 months. Planned at the rated lifespans from the filters installed on day one, the first two years bring one Viomi V6 PRO cartridge change at month 12 and a pair at month 24. With its CF rated for up to 6 months and its RO for up to 24 months, the G5P700A plan brings a CF filter at months 6, 12 and 18, then a CF and an RO filter together at month 24. Both RO membranes carry the same 24-month rating, so over those two years the difference between the systems comes entirely from the pre-filter: 12 months on one, up to 6 on the other.

Viomi V6 PRO cartridges use a tool-free twist-lock design, and a filter-life reset after each change restarts the countdown on the faucet and in the app.

Fitting Either One Under a Small Sink

The Viomi V6 PRO body measures 16.3 inches long, 5 inches wide and 12.8 inches high. For the G5P700A, Waterdrop's manual asks for 2 inches of space around the system so it does not rest against the cabinet.

Each system connects to the cold-water supply line under the sink and sends its drain line to the sink drain. On the G5P700A, the faucet's power cord passes through the countertop opening along with the faucet stem and the filtered-water tubing.

A compact kitchen often has a refrigerator with a water dispenser or an ice maker close by. Using the tee fitting in its box, the Viomi V6 PRO can also supply a compatible refrigerator or ice maker over standard tubing, so one under-sink unit serves both the faucet and the appliance.

For the Viomi V6 PRO, the smart faucet and the tee fitting for a refrigerator or ice maker line come in the box, and a step-by-step installation video covers the setup. Our readiness check for installing a smart water filter covers the cabinet and the cold-water valve in more detail.

Households That Will Prefer the G5P700A

Two features make the G5P700A the better match for some kitchens. Its 700 GPD rating suits households that use the RO faucet heavily through the day. Its G5P700A-CF filter adds minerals such as calcium, magnesium, sodium and potassium during filtration and brings the water to a pH of about 7.5, which appeals to anyone who wants mineral-added water without a separate cartridge. Waterdrop counts that layer as a stage of its own, rating the G5P700A as an 8-stage system, one more than the G5P700 without it.

A household that wants both of those will find the G5P700A covers that combination in one tankless system. Its smart faucet also shows TDS and filter life at the tap.

For mineral-added RO water within Viomi's lineup, the Viomi M1 handles remineralization in its PCB composite filter. Our explainer on built-in and add-on RO remineralization covers how the two approaches differ.

FAQ

How big is the gap between 600 and 700 GPD?

Converted from their ratings, 600 GPD works out to about 0.42 gallons per minute and 700 GPD to about 0.49 gallons per minute, a difference of roughly 0.07. The gap matters most in kitchens that run the RO faucet for long stretches, such as filling several large pots in a row.

How does the Viomi V6 PRO compare with its 800 GPD sibling?

The Viomi V8 PRO is rated at 800 GPD for busier kitchens and ships with a spare PCB filter in the box, while the Viomi V6 PRO's 600 GPD rating suits moderate use. Both share the 16.3 × 5 × 12.8 inch body, the 3:1 ratio, the faucet display and the app, and both use a PCB filter rated for 12 months and an RO filter rated for 24 months.

Does the mineral version need extra cartridges?

The G5P700A still uses two cartridges. Its mineral layer is part of the G5P700A-CF filter, so the mineral stage is replaced along with the CF filter every 6 months. Waterdrop also sells a bundle, WD-G5P700A-SET, with a second CF filter in the box.

Can either system go into a small apartment kitchen?

Both are tankless, which keeps the cabinet free of a storage tank. Each one connects to the cold-water line under the sink and to the sink drain, and the Viomi V6 PRO arrives with its smart faucet and tee fitting in the box, plus a step-by-step video for the setup.

Checks for a Moderate-Use Kitchen

1. A typical day at the sink, including its busiest half hour, shows whether a 600 GPD rating covers it or whether the extra headroom of 700 GPD is worth having.
2. Decide whether a refrigerator or ice maker should draw from the same purified line, since the Viomi V6 PRO can supply a compatible appliance through standard tubing and the tee fitting in its box.
3. Consider who in the household keeps an eye on filter status, since the Viomi V6 PRO shows it on the faucet, the panel and the app, and the G5P700A on its faucet screen and main-unit lights.
4. Settle whether mineral-added water matters to the household, since that is the clearest reason to choose a system with a mineral layer in its pre-filter.
5. Weigh how often you want to handle cartridges: once a year with a pair every second year, or a pre-filter every six months.