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U1 Space-Saving 4-in-1 Water Filter System

4 reviews
Regular price $699.00
MSRP $0.00 Regular price Price
Sale price Sale $699.00 Save % Sold out
Expected delivery:
  • Reverse osmosis water filter for the purest water
  • Water cooler for cold filtered water
  • Water kettle for customizable instant hot filtered water
  • Hydrogen ionizer for filtered Negative ORP water with antioxidant properties
  • 1 Year warranty

Want an advanced water filter system but don’t want to deal with messy hoses, leaky diverter valves, and clunky installation? Meet U1 by RKIN.

It’s a sleek, zero-installation water filter that uses reverse osmosis, UV, and hydrogen technologies to transform ordinary tap water into pure, healthy, and delicious drinking water.

It has an advanced filtration system that’s made up of five stages to give you the purest, most delicious drinking water imaginable, unlike other water filter systems on the market. Plus, you can choose your water’s temperature (hot or cold!), thanks to the temperature control system!

U1 Water Filter Features
U1 Advanced water filter system

We want you to have the best quality water in your home…

That’s why U1 has an advanced filtration system with five stages. It removes up to 99% of all contaminants, including Fluoride, Chlorine, heavy metals like lead, and more.

RKIN U1 water filter features
Plus, U1 has an intelligent touch control panel, so you can easily see the status of your filter. It also has a UV Light that keeps water fresh when the system is not in use.
How does U1 water filter works
RKIN U1 countertop water filter
RKIN U1 countertop water system
RKIN U1 countertop water filter system
RKIN U1 countertop reverse osmosis water filter

U1 doesn’t require installation, so you can easily place it on your countertop—perfect for people who live in apartments, condos, and RVs.

RKIN U1 reverse osmosis countertop water filter
RKIN U1 countertop water filter with hot and cold water
RKIN U1 countertop water filter with hot water

Do you ever wish your water filter system had hot or cold water?

U1 has a customizable default water temperature setting so that your water is always set to the temperature of your liking. Plus, there’s an instant hot water option that’s perfect for baby formula, tea, instant coffee, and more!

The display will also show the Hydrogen content and water quality readings, so you’ll always know your system is working properly.

RKIN U1 countertop water filter with hydrogen enriched water

U1 includes a polishing Alkaline post-filter that returns beneficial minerals, calcium, and magnesium to purified water for the best taste.

It also increases the alkalinity of the water to a perfectly balanced level of 7-8 pH, similar to spring water.

Plus, U1's hydrogen-infused water delivers a negative ORP of 340.

RKIN U1 countertop water filter money back

With a pre-order of U1, you get an unconditional 1-year money-back guarantee.

RKIN U1 countertop reverse osmosis water filter

If you opt to add our 2-year filter bundle to your order, you'll receive two annual replacement filter kits, two hydrogen PEM modules, and one reverse osmosis membrane. You'll get three years of use with this add-on!

Countertop Water System Comparison
RKIN U1 water filter details
RKIN U1 water filter features
U1 Water Filter what's included in the package
U1 Turn Table


Customer Reviews
4.8 Based on 4 Reviews
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United States United States
I recommend this product

Impressive, fun, efficient

I've only had the U1 for a few days. There was a slight learning curve as to how to use all the features, but once I did, I truly love this machine. It filters the water quickly and I love the features, temperature and volume settings, tea, coffee, hydrogen. I bought it to replace the Zero Installation Purifier (ZIP)which I was very happy with, but I'm happier with the U1. It handles twice the amount of water and filters it in about half the time or less. The auto shut off (with adjustable setting for number of ounces) mean I don't accidentally overfill a glass because I turned around and forgot about it ¯\_(ツ)_/¯. It is a lot bigger than the ZIP - I'm glad I have the counter space for it, so I recommend checking the measurements. I think a turntable is essential for access to the back for refilling, and the RKIN turntable was slightly too high to allow for fitting under the kitchen cabinets, so I found one on Amazon with less height which works great. It's only written in small print in the manual, but it seems important to emphasize the need to run the rinse cycle every two weeks to keep it clean. It is evident that a lot of thought went into designing this machine, and I've found customer support exceptional, always willing to be of service and answering every question, so not only do I love the machine, I really appreciate the company's dedication to it's products and customers.

Alisa L.
United States United States
I recommend this product

U1 vs Zero Installation Purifier

So I recently upgraded to the U1 from my Zero Installation Purification system. I do love both systems but I'm not sure which I love better. For those of you considering both systems but are unsure which to choose, I hope I can provide a little insight. I upgraded to the U1 because I wanted all the bells and whistles this machine provides. The Zero Installation system was great. It was simple and reliable. I still love it. However, I liked that the U1 was able to heat and cool water all at once. The hydrogen feature was an added perk that I've just recently learned the benefits of. I have very limited kitchen counter space in my small apartment, so I wanted to eliminate my Keurig which is what I used to make hot water for my tea. I figured by upgrading I would be able to free up some counter space. I knew the U1 was larger in footprint but I didn't know what to quite expect. The U1 turns out to be much larger and heavier. If you're limited on space this may not be the machine for you. The footprint of the Zero Installation system will take up less room and you don't have to move it once it's in place. The U1 is both longer and taller than the Zero Installation System. I have been using the U1 for several days now. Here is where I think the U1 needs improving. The thing I HATE most about the system is the placement of the supply tank. This really does need to be fixed. It is in the rear of the unit. The Zero Installation system had it conveniently in the front where it just slides in/out. My kitchen is so small that I don't have a place on the counter without upper kitchen cabinets. It is the upper cabinets that make filling the U1 an absolute nightmare. RKIN has designed a turn table to go with the unit but since the U1 is pretty tall, adding a turn table beneath it would just raise the height too much making it impossible to sit on any of my countertops. Furthermore, having the turn table takes up even more space. You now need a surface that is both the same in length and width because you have to turn the machine to access the supply tank to fill it with clean water. I wanted to put my new U1 in the same place my Zero Installation system sat but it's simply impossible because of where that supply tank sits. The U1 is now a bit of an eyesore in the middle of my kitchen counter next to my kitchen sink. Every time I have to change the water I have to lift that heavy tank up without the lift handle because I have no wiggle room because my upper cabinets are in the way. If the supply tank position can't be moved, I really WISH there was a way to just detach the dirty water part of the tank. I could always fill the tank with a pitcher but having the dirty water in a compartment attached to the new water portion of the tank makes that an impossibility. You have to lift it and then position it back into place every time the unit needs water. It's a big pain. Another thing I didn't realize about the U1 is that you cannot adjust the temperature for cooling. My unit doesn't cool below 66 degrees. It would be nice if I could get it to cool a little more but the system isn't designed to allow you to adjust cooling. You can only adjust the heating temperature. A way to adjust the cooling setting would be nice. Another concern of mine with the U1 is the internal reservoir that holds the filtered water. On the Zero Installation system, you can take it off and clean it as needed. With the U1 cleaning the clean water reservoir is an impossibility. You can see a part of it through the front of the unit. It has a little light in it. It's very pretty and cool looking for now. I anticipate this will change with time. I was an aquarium enthusiast or a long time and I know eventually all tanks with water in it grow algae. So I expect that to happen with this unit. I contacted RKIN about how I could access the tank to clean it and all I was told is that the unit should be rinsed every 2 weeks or so and that should help. Not sure how draining a system will help with scrubbing any algae growth that might happen inside the clean water tank but they say that it will. This will remain to be seen. I have concerns. Personally, I wish the tanks were reversed. I wish the supply tank was on the front of the unit and the clean water was on the back in a tank that would be free from any light. It would make for more practical use. I've also gone over the manual and realized changing the hydrogen membrane will be challenging to replace. I know RKIN has touted that all filter changes are done from the top and it's an easy twist and put into place. This isn't completely true. A majority of the filters look to be that way but the hydrogen membrane is located on the bottom of the unit. So you'll have to flip the unit on its side to get to it. Dreading the day I have to get in there for that change. Changing filters in the Zero Installation system is not at as easy as these filters seem to be to change. That was another part that drew me to the U1. Overall the U1 does not disappoint. I'm giving it 4 stars instead of 5 because it needs improving. I'm hoping RKIN will take into consideration some of these small gripes when designing an improved model down the road. I still go back and forth between the Zero Installation and the U1. If you have limited space and you want a trusty machine that will push out clean drinking water at once, then go with the Zero Installation system. If you want bells and whistles and have the space for it, definitely give the U1 a try. I love both systems and RKIN has never disappointed me when it comes to its customer service. I truly believe in their products.


Hello Alisa, Thank you for the detailed review, feedback, and comparison between U1 and Zero Installation Purifier. Since using the turntable is not an option in your case, there is a life hack you can try. Place a kitchen towel or some other cloth under the U1. This allows for a lot less grip than the U1's rubber feet and makes it much easier to slide and turn the system on most countertops. During our testing, we placed the front-facing tank under direct sunlight for months trying to get the algae to grow without much success. However, in the unlikely event that the algae does become an issue, the hydrogen module opening is big enough for a small brush with direct access to the tank. U1 has a cooling fan that exhausts on the right side. If the flow of air is obstructed, then the cooler might struggle. Giving a bit more space to breathe might be worth a try. We hope this information helps. We greatly appreciate your input. Thanks again.

United States United States
I recommend this product

So far it’s great!

My U1 came in last night and just got it put up a little while ago. Right now learning all the different settings. It’s really cool the way you can get boiling hot water out of it, then turn around and get cold water out of it. I already own the Zero Installation purifier, have had it a year now. It’s done a pretty good job. Reason I wanted this one is because I’m on well water, and I needed one that would get rid of the bacteria in the water. The U1 fits the bill. It’s gonna be great for my Aquarium too, now the water will be pre-heated for the water changes. Happy so far, will know more down the road the longer I own it. U1 Space-Saving 4-in-1 Water Filter System Review

Hello Mart, Thank you for the picture and the review. U1 will be a useful companion for years to come.

Ashkan V.
United States United States
I recommend this product


Amazing product; have been using it for a few days and it has surely exceeded my expectations. The instant hot/cold water feature is unbelievably helpful.


Hi Ashkan, We are happy to hear you find the instant hot/cold water feature very helpful. Thank you for your review.