Best tankless Reverse Osmosis (RO) Water filter systems

Top 9 Tankless Reverse Osmosis water filtration systems in 2021

Reverse osmosis water filters are currently one of the trending products for most households out there. There are so many varieties of it.

Some come with five stages of filtration, while others come with six or more. Also, the design varies from one brand to the other.

Even though these filters provide you pure drinking water in no time, they also have some setbacks. The most common of those is that they eat up too much space.

The storage tank contributes to this significantly. That’s why nowadays, some exclusive RO purifiers come with no tank at all.

In this article, we’ll be showing you some of the best tankless reverse osmosis water filters in the market. So, if you’re looking for one, stay tuned. Let’s begin.

Our list of the top tankless reverse osmosis systems

Before we dive into the details of the recommended products, let’s take a look at our list of the current best tankless RO water filters.

Waterdrop WD-G3 Tankless Reverse Osmosis water filter

Highlighted features of the Waterdrop WD-G3 tankless RO water filter

Number one in our list is the Waterdrop WD-G3 Under sink reverse osmosis water filter. There are several reasons behind such that. Let’s take a look.

Stylish and innovative design

The first thing that will come to your attention is its stylish and original design. Unlike most conventional RO purifiers, it is tankless.

As a result, the product isn’t bulky or cumbersome. That also allows you to set it up nicely in your preferred location. 

Multiple stages of filtration

Apart from its stylish outlooks, it also comes with multiple stages of filtration to provide you pure drinking water fast.

The sediment filter removes the dust, rust, clay, and sediment particles from the water. The activated Carbon layers get rid of the Chlorine, Chloramine, and other organic odor.

Then, the robust reverse osmosis chamber wipes out the dissolved pollutants from the water. Finally, there is the post activated carbon filter to improve the taste.

Built-in booster pump

As the filter doesn’t have any tank, it comes with a strong booster pump of its own. The pump plays a vital role in purifying water.

RO filters require high enough input water pressure to perform well. If the flow rate is low, the pump will work on increasing it so that the tankless RO system can filter water fast. 

Low water rejection

Although most RO water filters produce a lot of waste-water, the scenario isn’t the same for Waterdrop WD-G3 tankless RO water purifier.

Here, the drain to product water ratio is 1:1 that you might not find in too many RO water filters out there. As a result, it will save you a lot in the long run.

Comfortable installation and maintenance

One great thing about the product is its quick installation manual. With it, you can set up your one in no time. The maintenance is simple as well.

That’s not all. The product also has NSF/ANSI 58 and 372 certifications. Also, all of its parts have food grade quality. 

Pros and cons of the Waterdrop WD-G3 tankless RO water filter

Pros

Cons

Frizzlife WA99 Tankless Reverse Osmosis Water filter

Highlighted features of the Frizzlife WA99 RO water filter

Next in our list is the Frizzlife WA99 tankless reverse osmosis water filter. So, let’s find out more about the product.

Portable and elegant design

The first thing that comes into notice about the Frizzlife WA99 tankless RO purifier is its compact and elegant design.

Most conventional reverse osmosis water filters take up too much space during installation. Meanwhile, the tankless design of the Frizzlife WA99 enables you to carry it anywhere.

Four stages of filtration

In addition to its stylish design, the product offers four stages of filtration to purify your water. The first sediment filter takes out the dust, debris, and other insoluble pollutants.

Then, the water enters into the granular activated carbon filter, which removes the Chlorine and Chloramine for better function of the RO membrane.

The RO membrane removes the dissolved solids from the water. Finally, the post activated carbon filter will take care of any bad taste or odor.

Extremely low wastewater

One tremendous aspect of the Frizzlife WA99 tankless water filter is its spectacular water rejection rate.

While most RO water purifiers would produce four gallons of wastewater to give you only one gallon of purified water, the situation reverses in the Frizzlife WA99.

Its water recycle technology wastes only one gallon of supply-water while purifying five gallons. Hence, you see, it can save you a lot on water costs.

Zero installation and easy maintenance

The fully-assembled Frizzlife WA99 requires no further installation. Plug it in, and you’re good to go. That’s not all. The twist-in replacement also makes maintenance simpler.

In addition to all these, the product also has indicators to show if your water has high TDS. Moreover, it will give you updates on when it’s time to replace the cartridges.

  • So, considering all these, the Frizzlife WA99 can be a great water filter for you. If you want to take a look at its current pricing, take a look at Amazon here.

Pros and cons of the Frizzlife WA99 RO water filter

Pros

Cons

iSpring RO5000 Tankless Reverse Osmosis water filtration system

Highlighted features of the iSpring RO500 RO water filter

The next product on our list comes from one of the top dogs in the business, iSpring. Yes, we’re talking about the iSpring RO500 Tankless RO water filter.

Let’s find out why the product stands out.

Modern and compact design

Like the previous tankless water filters in our list, this one also offers you a modern and stylish look. The tankless design makes it light-weight as well.

Its compact design also allows you to save more space at your home or office. That’s not all. The design makes sure all the components are close to each other and avoids any delay.

Composite filtration

Along with its elegant looks, the product also offers you pure and clean drinking water with its lasting filter stages. 

The first stage contains a composite water filter that will remove all the sediment, dust, Chlorine, and other pollutants. Then, the RO membrane removes the soluble contaminants.

After that, water goes through the activated carbon filter. It will get rid of any bad taste or organic pollutants from the water. In this way, it serves you tasty drinking water all the time.

Incredible water rejection rate

The tankless purifier contains a built-in booster pump to purify and serve you water as fast as possible. It also makes sure the water rejection rate is low.

An amazing fact about the product is it only wastes 1 gallon of water while purifying 2 gallons. As a result, its operational cost will be lower compared to the conventional RO purifiers.

Comfortable installation and replacement

One other positive aspect of this eco-friendly water filter is that it offers a comfortable DIY installation. It comes fully assembled. You only have to set it up in your preferred spot.

The cartridges will also last longer. There will be indicators that will alarm you when it’s time to change the filters. That’s not all.

The product also offers you top-notch customer service. You will also get one year of warranty. Therefore, you see, the product can be a great addition to your home.

Pros and cons of the iSpring RO500 Under sink RO water purifier

Pros

Cons

SimPure Q6 tankless reverse osmosis water filter system

Highlighted features of the SimPure Q6 tankless RO system

Number four in our list is the SimPure Q6 tankless reverse osmosis water filter system. So, let’s talk about it.

The new generation of RO filters

The SimPure Q6 tankless RO water filter is one of the leading ones in this industry. Its sleek design will surely attract your attention.

Most conventional RO purifiers require enough space to set up. That’s not the case here. Its innovative shape can save up to 4 times less space than the other RO systems.

Four stages of filtration

The modern look is only one of the aspects the product offers. But, its top priority is to serve you pure drinking water. That’s why it has four stages of filtration inside.

The first sediment stage removes the big particles floating in the water. Then, the activated carbon filter removes Chlorine, Chloramine, or other organic waste.

The third stage is the sediment PP membrane, which removes the remaining insoluble particles. Finally, the RO membrane gets rid of the remaining pollutants.

In this fashion, this RO system ensures your water is 99.99% germ-free.

Higher efficiency

Many of us blame RO filters due to their high water wastage. But, it changes with the SimPure Q6 tankless Reverse osmosis water filter system.

The internal pump enhances the pressure head inside the system. As a result, the pure water to the drain water ratio stands at 1.5:1.

Also, as the RO system is tankless, there is no room for secondary pollution. So, you see, the product offers you pure drinking water at high efficiency.

Easy-to-follow DIY installation

Apart from all these features, the product also comes with a DIY installation manual. It will help you set up the filter in no time.

That’s not all. Maintenance is easy, as well. There is a filter life indicator that will notify you when it comes to the time for a replacement. 

In addition to the 30 days money-back guarantee, it will also offer you two years of warranty with excellent customer support.

All in all, the product can be your next home RO water system. It also comes at a very reasonable price. So, check it out here on Amazon.

Pros and cons of the SimPure Q6 tankless reverse osmosis system

Pros

Cons

Frizzlife PD600-TAM3 Tankless Reverse Osmosis system

Highlighted features of the Frizzlife PD600-TAM3 RO water filter

The next product on our list is another tankless RO system from Frizzlife. Its name is Frizzlife PD600-TAM3 tankless RO system.

So, let’s learn more about the product.

Elegant design with a stylish faucet

The Frizzlife PD600-TAM3 fashions a modern and stylish outlook compared to the other RO water filters out there. It also comes with a stainless faucet.

All these can add to the aesthetic beauty in your kitchen. Also, its compact design will require up to 70% less space. 

Pure water with multiple stages of filtration

Apart from its smart design, it also comes with multiple robust stages of filtration to remove the pollutants from your water.

The first stage is the composite filter stage that gets rid of all the insoluble, microscopic particles. Some of those are Chlorine, dust, rust, Chloramine, odor, and so on.

Then, the water gets into the high-grade reverse osmosis membrane. It will eliminate 99% of the dissolved solids and other pollutants from your water to make it pure and clean.

Alkaline water with good taste

As the RO membrane gets rid of all the dissolved electrolytes, the water will be pure. But, it will be slightly acidic compared to tap water.

That’s why the Frizzlife PD600-TAM3 tankless RO water filter comes with a remineralization unit. It will restore the mineral contents, and the water will go back to a healthy pH level.

Low drain water production

The internal booster pump makes sure you get water at a sufficient flow rate and fast. It also increases the efficiency of the RO system.

In addition to this, it has an excellent drain water ration. Typical RO systems would waste 3 gallons of water to produce only one gallon of purified water.

On the other hand, the Frizzlife tankless RO system has a product to drain water ratio of 1.5:1. So, you can realize, the filter will save 450% more of the supply-water. 

Easy installation and maintenance

The product reaches you fully assembled. That’s why the installation couldn’t be easier. Also, maintenance isn’t far off from that.

There is a LED display that will remind you when it’s time to replace the cartridges. Also, the built-in TDS indicator monitors the particles in the water all the time.

Considering all these, you can realize the Frizzlife PD600 tankless RO system can be the perfect water purifier for home, office, or anywhere else.

So, are you feeling interested? Come, check out the product here on Amazon.

Pros and cons of the Frizzlife PD600-TAM3 RO water filtration system

Pros

Cons

Waterdrop WD-G2P600 tankless Reverse Osmosis System

Highlighted features of the Waterdrop WD-G2P600 Tankless RO water filter

Next in our list is another tankless RO system, the Waterdrop WD-G2P600 Under sink Reverse osmosis system. So, let’s see what if offers.

Compact and light-weight

The first thing that will surely come to your notice is its design. Its modern outlook enables it to be light-weight as well.

Although conventional RO water purifiers can be bulky, it isn’t the same for the Waterdrop WD-G2P600 tankless RO system. So, it will save a lot of space in the kitchen.

Composite water filtration

If you take a look at the specifications of the product, you will find that it comes with composite water filters to get rid of all the germs and pollutants.

The CF filter has a sediment filter and an activated carbon layer. It will remove any dust, rust, sediment, Chlorine, or organic matter.

The MRO filter has a RO membrane, followed by a sediment PP membrane and an activated carbon filter. Together these reduce the particles down to 0.01%.

Faster flow rate

The built-in booster pump makes sure you get an adequate amount of pure drinking water fast. It takes only 8s to fill up your cup.

The product also offers a lot of savings in wastewater. Here, the drain water to the pure water ratio is 1:2. That means it will purify 2 cups of water and waste only one cup.

Leakage proof system

One other thing about the Waterdrop WD-G2P600 is that it offers auto shut off technology. If it detects any leakage, it will shut off the system instantly.

All the components consist of safe materials and offer high-quality. Also, setting up couldn’t be any easier. Maintenance is simple as well.

You only need to replace the CF filter every year, while the MRO filters will last for at least two years. 

The product’s price might seem a little bit high, but remember how much it will save you on your water bill. So, why don’t you check out its price here on Amazon?

Pros and cons of the Waterdrop WD-G2P600 Tankless RO water filter

Pros

Cons

GreatWell ROG400 Tankless Reverse Osmosis system

Highlighted features of the GreatWell ROG400 Tankless reverse osmosis water filter

Next in line is the GreatWell ROG400 Tankless reverse osmosis water filter. Let’s take a good look at the product.

Smart integrated design

First, let’s talk about the design of the GreatWell ROG400 Tankless RO water filter. Like all the other filters on our list, this one also offers a fresh look.

The vertical filters ensure it will require 30% less space compared to the conventional RO purifiers out in the market.

Combination of robust water filters

The GreatWell ROG400 tankless RO system comes with three types of filters inside. The first one is the composite filter. Inside there is a sediment filter with an activated carbon layer.

With its versatile design, it removes most of the insoluble pollutants from the water. Then, it enters into the RO membrane, which pulls out 99% of the dissolved particles.

After that, water will enter the activated carbon filter, which will add a fresh taste canceling any odor.

High efficiency

With its smart sensors, it will prevent any leakage from the system. The internal pump also ensures up to 400 gallons per day.

Apart from this, the product also has a magnificent water rejection rate. It will waste only two gallons of water while purifying three gallons.

So, you see, the product offers you a subtle way to minimize water bills. 

DIY installation and maintenance

In addition to all these features, the GreatWell ROG400 tankless RO filter also offers an easy to follow DIY installation manual.

That’s not all. Some indicators monitor the filters’ lifespans individually. With all these, the product also comes at a reasonable price.

So, why are you waiting? Come, check it out here on Amazon.

Pros and cons of the GreatWell ROG400 Tankless RO water filter

Pros

Cons

iSpring RCS5T Tankless Commercial Reverse Osmosis System

Highlighted features of the iSpring RCS5T Tankless RO water filter

Number eight in our list is another RO purifier from the famous brand, iSpring. Its name is the iSpring RCS5T tankless commercial Reverse Osmosis water filter system.

Now, let’s find out what the product offers.

Traditional design

The iSpring RCS5T tankless RO system is the only product in our list to resemble the conventional RO purifiers in the market.

But, being tankless, it also saves you some space. Also, it comes with a stylish chrome faucet.

Five stages of filtration

Like all the other iSpring reverse osmosis systems, this one also gives you pure and clean drinking water at a high flow rate. 

The first stage consists of a sediment filter that removes the dust, rust, or sediment particles. Then, there are two stages of carbon filtration. It will get rid of the Chlorine or organic chemical.

After that, water will enter the RO membrane. It will wipe out most of the dissolved solids from the water. Finally, the post Carbon filter is there to replace any odor with a fresh taste.

Increased efficiency

The product comes with a high-capacity booster pump to compensate for the tankless design. It can serve up to 500 gallons of purified water each day.

Due to the pump, efficiency is high as well. The water rejection rate is 1:1. That means it will only waste one glass of water to purify another. So, it will save 60% of wastewater each time. 

That’s why the product can be an incredible option for commercial usage.

Easy installation and replacement

As the product doesn’t have a tank, there will be fewer tubings to connect here. There is a step by step installation manual available.

The maintenance is also straightforward. You have to replace the cartridges from time to time, and you’re good to go.

So, you see, with its high efficiency and faster yield, the product is quickly gaining popularity among the customers. 

Why don’t you check out the iSpring RCS5T tankless RO filter here on Amazon?

Pros and cons of the iSpring RCS5T tankless RO water purifier

Pros

Cons

Waterdrop WD-G2 Tankless Reverse Osmosis system

Highlighted Features of the Waterdrop WD-G2 tankless RO filter system

The final choice on our list is another product from Waterdrop. It is named Waterdrop WD-G2 tankless Reverse osmosis system.

Let’s find out the details.

Two composite stages of filtration

The product will serve you tasty and pure drinking water with the help of two composite water filters. The first one is the CF filter, and the second one is named the MRO filter.

The CF filter contains a sediment filter and an activated carbon filter inside. Together these two remove pollutants like dust, rust, debris, sand, Chlorine, and so on.

The MRO filter comes with a robust RO membrane. It can get rid of 1000 types of contaminants. After that, there is the sediment PP membrane to clear out the residue.

Finally, there is the post activated carbon filter, which will improve the taste of the product water.

Elegant and compact design

The Waterdrop WD-G2 water filter represents the next generation of RO water systems. Its compact design is worth its price.

Also, having no tank enables you to set it up even in the narrowest spots. So, you see, the product will save about 70% storage space compared to other conventional RO systems.

High Capacity pump for better yield

Like the other tankless RO filters, this one also comes with a high-capacity booster pump. If supply-water pressure falls, the pump will increase it to serve you water fast.

That’s not all. The pump and efficient filter also make sure less water goes to the drain. As a result, the drain water to the product water ratio is 1:1 here.

So, you see, the filter is eco-friendly and wastes less water.

Hasslefree maintenance

The product comes to you fully assembled. As a result, you don’t have to connect too many tubings here. Therefore, the installation is simple. 

Also, there will be indicators to notify you when it’s time to change the filters. The internal smart technology makes this possible.

So, you see, if you’re looking for a budget-friendly tankless RO system, the Waterdrop WD-G2 can be a great choice. You can check out its current price here on Amazon.

Pros and cons of the Waterdrop WD-G2 tankless RO filter system

Pros

Cons

What is a Reverse osmosis water filter?

Reverse osmosis water filters are filters that use a semipermeable membrane to block the dissolved pollutants from the water.

Most RO purifiers combine a variety of other filtration to maximize efficiency. There can be sediment filters to remove the dust, rust, clay, or sand particles.

Also, most of those use activated carbon filters to remove Chlorine and organic matter from the water. So, you see, most RO filters have more than one stage.

If you would like to know more about reverse osmosis, you should visit our recent article here. Also, you can check out this post to find out the components of a RO water purifier.

Why does a RO filter require a tank?

Most conventional RO water purifiers come with a storage tank. Why? The answer lies in the reverse osmosis process.

The RO filters use the incoming supply-water pressure to purify the water. But, as the filtration requires time, it cannot produce pure water instantly.

That’s why most RO filters would store the water in a tank. As soon as you open the faucet, the water will reach you from the tank.

As water first stays in the tank, there is a chance of secondary pollution out there.

How does a tankless reverse osmosis system work? 

The tankless RO systems use a high capacity internal pump to increase water pressure. As the pressure increases, purification happens fast.

Therefore, the tankless systems don’t require a tank to store water beforehand. It can purify and serve you in real-time.

Buyer’s guide: What to look for in a tankless RO water filter system

Now, let’s take a look at various aspects of a tankless reverse osmosis system.

Compact Design

Going for a tankless RO water filter means you need to save some space. Therefore, you should check whether the RO system you choose can fit in your intended spot.

Stages of filtration

Another top priority aspect is the stages of filtration the product offers. You should take a look at how many types of filters are there.

You can check out our post here to learn more about the various stages of water filters.

Mineral water

As RO water filters produce slightly acidic water, you should invest in a filter that will get rid of that. It happens as the membrane removes the minerals.

That’s why the Frizzlife PD600-TAM3 tankless RO system can be a perfect choice as it will restore the electrolytes into the water.

Low Water rejection rate

Conventional RO purifiers waste a sizable portion of the supply water. On the other hand, all tankless RO systems significantly reduce RO-reject water.

If waste-water is an issue for you, you should check out the Frizzlife WA99 tankless RO water filtration system.

Installation

One other aspect of tankless RO systems is that all of those come already assembled. As a result, installation and maintenance are hasslefree.

Pricing

Most of the tankless RO water filters are a bit pricey. But, keep in mind the fact that it will save you a lot by producing low waste-water.

Also, if you’re for a budget-friendly choice, the SimPure Q6 tankless RO system can be reasonable enough.

Buyers' guide: how to pick your own tankless reverse osmosis water filter system

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top