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

9 reviews
Regular price $699.00
MSRP $0.00 Regular price Price
Sale price Sale $699.00 Save % Sold out
  • 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 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

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


What are the dimensions of the U1?

9.5 Inches Wide, 17 Inches High, 19 Inches Deep, 26 lbs.

How long does it take to heat water to boiling temperature?

U1 uses instant-hot technology. Hot water is immediately available even at boiling temperatures, limited only by a total system max volume of ½ gallon.

How long does it take to cool water, and what is cold water volume?

It takes about 15 minutes to cool 15 ounces of water at a time to 59F/15C. When the cold water button is pressed, U1 will display “COOL” when the water temperature has reached maximum cold or “PREP” if cooling is still in progress. No need to wait for the cooling process to complete; cold water can be dispensed at any time.

Can the water cooler be turned off for energy-saving purposes?

Yes, press and hold the “cold” water button for 5 seconds to turn off or turn the water cooler back on.

What negative ORP(Oxidation-reduction potential) readings can I expect from U1 hydrogen-enriched water?

During our internal testing, we got negative ORP readings from -330 to -347 on average. Individual results may vary.

Can the hydrogen function be turned off?

Yes, hydrogen production can be turned off or on with a press of a “hydrogen” button.

How much filtered water does U1 hold?

About ½ gallon of filtered water at a time. U1 filters ½ gallon of water in under 7 minutes. Twice as fast as Zero Installation Purifier.

What is the pure water to waste water ratio?

1 Gallon of water is loaded into the system. U1 makes ½ gallon of pure water and another ½ of a gallon of wastewater with all the impurities in it. Since wastewater contains all the impurities, it’s NOT recommended for consumption. However, it can be used to water plants, rinse vegetables, etc.

Does the wastewater mix with the intake water and is filtered over and over as it’s common with other systems?

No, all the wastewater is deposited into a separate section of the supply tank and is no longer used for pure water production.

How often does the hydrogen PEM module need to be changed, and how much does it cost?

On average, about 6-12 Months, a U1 hydrogen PEM module costs $39.95.

How often do the filters need to be changed and how much do they cost?

Every 12 Months. U1 filter bundle: $69.95 per complete set of two filters consisting of one pre-filter and one AlcaPure post filter.

How often does reverse osmosis membrane need to be changed and how much does it cost?

Every 2-4 years. U1 Reverse Osmosis Membrane costs $69.95.

How do I order replacement filters?

If you sign up for our filter subscription program during checkout, the replacement filters will be delivered to you every 12 months automatically. Otherwise, replacement filters can be ordered on our website or over the phone.

Does U1 use proprietary filters available only from RKIN and reseller partners?

Yes, we designed our own filters to make filter changes as easy as possible with ¼ turn to remove and leak-free features.

Does U1 remove the "XYZ" contaminant?

U1 uses a multi-stage reverse osmosis technology. Reverse osmosis is one of the best ways to purify water when it comes to cost per gallon, speed, and purity of the water. Undersink reverse osmosis water filters have been around for decades and have been extensively studied by the scientific community.

Because of U1’s unique design, preventing back-pressure within the RO membrane, it performs as well or better than most high-quality under sink reverse osmosis systems.

The second stage - Carbon Block pre filter alone tackles a multitude of contaminants even before they get to the reverse osmosis membrane.

But, we understand that you may want to do your own research. So the fastest way to get an answer is to do an online search for "reverse osmosis removes XYZ" and review scientific papers. Replace "XYZ" with a contaminant of your choice. Or you can always contact our customer support here.

Does U1 work with 220V electric outlets?

No, the current version is suitable for 100V-120V electric outlets only - USA, Canada, Mexico, Japan, etc. However, 3rd party 220V to 120V voltage converters can be used. Must be rated for 1500 W continuous power.

Is it possible to switch to metric measuring units?

U1 will only display imperial units for temperature - Fahrenheit and ounces for water volume.

What is the warranty on U1?

You get an unconditional 1-year money-back Guarantee, which includes warranty for the same period. We will even cover return shipping if the product is returned within 30 days of purchase. Free shipping on warranty replacements. Learn more

What if I have questions or need support?

You can always call us at 1-800-803-4551 Monday through Friday 9AM-5PM EST or submit a request here.

RKIN© Countertop Water System Models: RKIN-U1

Download U1 manual by clicking here.

For indoor non-commercial application only:

Use room temperature water 20-26°C (68-78°F)
Ambient Temperature: 4-40°C (40-104°F)
Input Power: 100-1200V 60Hz
Rated Power: 1500W
Rated Heating Power: 1400W

Inlet water quality limits:

Max Total Dissolved Solids (TDS) 800 mg/L
Max Hardness 25 gpg (428 mg/L)
Sulphide, Iron & Manganese <0.1 mg/L
Chlorine <4 ppm, pH 3-11, Turbidity 5 NTU Max.

Your water quality may affect the longevity and replacement frequency of the filters.

First and Second Stage Filtration - RKIN 2 in 1 Sediment and Carbon Filter QT Series. MPN: RC-QT-PAC. Replace every 6-12 months or as needed.

Third Stage Purification - RKIN 200 GPD Encapsulated Reverse Osmosis Membrane QT Series. MPN: RC-QT-RO. Replace every 12-24 months or as needed.

Fourth Stage - RKIN AlcaPure Alkaline Post Filter QT Series. MPN - RC-QT-CF, Replace every 6-12 months or as needed.

Fifth Stage - RKIN U1 Hydrogen Module. MPN: RC-HGPEM, Replace every 6-12 months or as needed.

Free standard shipping within US and Canada.

Orders are usually shipped the same or the next business day and delivered within 2-5 business days. RKIN fulfilment network is able to deliver U1s to 95% of US population within 2 business days. Subject to in-region item availability and seasonal carrier shipping performance.

Order tracking numbers are emailed as soon as they become available. If you do not receive your tracking number within 24 business hours, please check your spam folder.

We work diligently to make sure that we offer the best prices for our products online. If you come across another retailer offering a lower price for our products than we are within 12 months of your purchase date, please let us know and we will refund you the difference in price.

We want you to feel confident that you are getting the absolute best price for the product you are ordering from us. If you find that our own website,, has lowered the price for the same item you ordered within 12 months of your purchase date, please let us know and we will refund the difference in price.

You get an unconditional 1-year money-back Guarantee, which includes warranty for the same period. We will even cover return shipping if the product is returned within 30 days of purchase. Free shipping on warranty replacements. Learn more


Customer Reviews
4.9 Based on 9 Reviews
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A Customer
Stephen B.
United States United States
I recommend this product


The machine is so versatile and convenient! Grateful for it!

Brent M.
United States United States
I recommend this product

Great Water Purifier

Overall, I love the system and delivers great tasting water! The family all love it and we use on a daily basis. The turntable not so much. This will not fit under a standard kitchen cabinet so is useless to me. Customer service has been great so far in returning the item since I can't use it. There are some alternatives on Amazon that are thinner and will fit with this machine. We look forward to using the machine for years to come.

Mr. BEK M.
United States United States
I recommend this product

Great Product and Great Customer service

Great Product I would definitely recommend it !

Juan S.
United States United States
I recommend this product


Excellent taste and quality. This is my second-generation purchase; I highly recommend this product.

Zachary W.
United States United States
I recommend this product

Rkin U1

This machine is Amazing! Every feature was carefully thought about and very well excited. My favorite part is that I can put my cup down and fill my cup without standing there it fills it automatically. I love the hydrogen water.