Viomi V8 Pro

Overview

I just spent the last week testing a new under-sink water filter from Viomi, specifically the Viomi V8 Pro. I've always been skeptical about whether these advanced filtration systems actually make your water taste better or if it's mostly marketing hype. Coming in at just over 400 bucks on Amazon, this tankless reverse osmosis system makes some bold claims about purifying your tap water and removing hidden contaminants.

Before testing this unit, I used to tell my wife she was crazy for thinking there was a noticeable difference in the taste of various water brands. I decided it was time to put those claims to the test using actual science, blind taste tests, and a few extreme scenarios to see what the V8 Pro could really handle in a real home environment.

What makes the Viomi V8 Pro notable right out of the gate is its tankless design and robust nine-stage filtration process. Instead of taking up half your under-sink storage with a massive reservoir, it filters on demand. I wanted to see if it could actually turn gross tap water into something comparable to premium bottled water, and more importantly, if it was worth the asking price.

Real-World Performance

To kick things off, I set up a blind taste test for my wife. I poured a glass from the Viomi V8 Pro, a glass of tap water, and several bottled waters including Fiji, Dasani, Smartwater, Aquafina, Pure Life, and Liquid Death. I let them all sit on the counter for five hours to ensure they were the exact same temperature. My wife ranked the Viomi filtered water as the absolute best-tasting option, noting that it had the cleanest profile, while immediately identifying and rejecting the tap water as 'gross.'

Next, I ran a taste test on myself, comparing fridge-filtered water, tap water, and the Viomi V8 Pro. Even though I typically suck at taste tests, I easily identified all three. The Viomi water was instantly recognizable because it simply tasted like nothing. That complete lack of taste is exactly what you want from highly purified drinking water.

Wanting to push the limits, I unplugged the unit's main water line and dropped it straight into a bowl of thick, muddy water. As the system filtered the mud, I watched the glass fill up crystal clear. There wasn't a single trace of dirt visible. I handed this freshly filtered mud water to my wife without telling her where it came from, and she drank it without hesitation, confirming it tasted great.

I also tried filtering saltwater, mixing three spoonfuls of French grey salt into a glass. While the system managed to filter out a lot of the impurities, it didn't remove the salt completely. I could still taste the saltiness, though it was surprisingly palatable and technically drinkable in a pinch. Finally, I tested the Total Dissolved Solids (TDS). My tap water measured a staggering 526 on the meter (fluctuating up to 544). The fridge filter brought that down to 363. The Viomi V8 Pro dropped it all the way down to just 48, a massive difference of nearly 500 points.

Design & Build Quality

When it comes to the build, the standout hardware piece is the smart faucet. It feels premium and features a built-in display that stays dark when not in use. Once you turn the handle, the screen lights up to show you the real-time TDS reading of the water flowing into your glass. It has a very nice, consistent flow rate that doesn't sputter or splash violently into the sink.

Underneath the sink, the tankless design is a huge win for storage and organization. Without a bulky holding tank to worry about, the main unit sits neatly to the side and doesn't monopolize your cabinet space. The filters themselves are incredibly easy to access; you simply turn them to pull them out when it's time for a replacement, which takes a matter of seconds.

However, the installation process does come with a significant physical requirement. To do a proper hard install of that smart faucet, I would have had to drill a hole straight through my countertop. Since I didn't want to permanently modify my counter just for this test run, I had to route it temporarily into my sink. That's a crucial build factor to keep in mind if you are a renter or hesitant to drill into expensive stone.

I was also highly impressed by the system's efficiency. Reverse osmosis systems are notorious for generating a lot of waste water, but the Viomi V8 Pro handles this beautifully. In my testing, for every full mug of clean drinking water the system produced, it discharged less than half a mug of waste water from the discharge tube.

Key Features

The filtration technology inside the Viomi V8 Pro is extensive. It utilizes a nine-stage filtration system that includes a 0.0001 micron RO (reverse osmosis) membrane alongside carbon composite and PCB filtration. This setup is designed to capture tiny particles and reduce chlorine, though my personal chlorine drop test showed my local tap water didn't have any chlorine present to begin with.

Another major feature is the filter lifespan and tracking. The smart faucet explicitly tells you when it is time to change out the PCB and RO filters, removing the guesswork entirely. The RO filter is rated to last for 2 years, while the PCB filter lasts for 1 year. Both filters are capable of producing roughly 7,200 gallons of purified water before needing a swap.

Viomi also includes an extra PCB filter right in the box, which essentially gives you two full years of filtration before you have to buy any replacement parts. The system also self-cleans to maintain optimal performance and is fully compatible with your refrigerator or an ice maker if you want to route the clean water directly to your existing kitchen appliances.

Who It's For

I'd recommend the Viomi V8 Pro to any homeowner looking to drastically improve the taste and purity of their tap water without sacrificing all their under-sink storage. It is ideal for families who currently waste money on bottled water and want a high-yield, low-waste reverse osmosis system right in their kitchen.

Who Should Skip It

If you are currently renting your home or living in an apartment where you cannot permanently modify the kitchen, you should look elsewhere. The requirement to drill a hole in your countertop to mount the smart faucet makes this impractical for temporary living situations.

How It Stacks Up

In the broader landscape of home water filtration, the Viomi V8 Pro easily outpaces standard refrigerator filters. In my direct comparison, the fridge filter only dropped my water's TDS from 526 down to 363. While that is a slight improvement, it doesn't come close to the 48 achieved by this dedicated reverse osmosis setup.

Compared to constantly buying premium bottled water like Fiji or Smartwater, an under-sink RO system is infinitely more convenient and environmentally friendly. My blind taste tests proved that the Viomi actually outperformed several major bottled brands in terms of providing a clean, tasteless drinking experience.

While I haven't directly compared this to other tankless RO systems on camera, the inclusion of a smart faucet with a real-time TDS display sets it apart from more basic, traditional under-sink filters. The tech integration gives you tangible proof that the system is working every single time you turn the handle.

Final Verdict

After a week of intense testing, the Viomi V8 Pro has completely changed my mind about home water filtration. Going from a TDS reading of over 500 down to under 50 is a difference you can actually taste, and watching it turn literal mud into clear drinking water was incredibly impressive.

For just over 400 bucks, you are getting a highly efficient, space-saving system that produces fantastic water with very little waste. As long as you are comfortable drilling a hole in your counter for the installation, the Viomi V8 Pro is a phenomenal upgrade to your daily hydration.