10 Reviews: Best Tankless RO Water Filter System (Sep 2023)

The iSpring WGB21B proves that it’s possible to get a quality tankless whole house water filtration system without spending a fortune. You can get 50,000 gallons of pure water each year with just two stages of filtration, which is enough for a household of four. It eliminates cloudiness as well as unpleasant tastes and odors, removes over 90% of chlorine, and is particularly effective against VOCs.

I've had this unit for two years now and love it. Sean in tech support was very helpful.

by jerry wray

The RO-CTOP is the most ideal option for RV owners, renters who don’t want to modify existing plumbing or anyone who wants a portable RO filter since it is super compact and easy to install anywhere with a sink.  You’ll love the 4-stage ultra-pure system, which delivers a crisp, refreshing taste that rivals bottled water. There’s also the option of purchasing it with or without the case.

Super easy to use portable RO system, resulted in 6PPM water from a 190PPM source tap, water tastes great, excellent results in my book. Quality stainless parts, no leaks, had it up and running in a few minutes. I prefer to use a tankless system like this ...

by Salimoneus

The Brondell Circle Reverse Osmosis System is an all-in-one, easy-to-install complete system. Its elegant chrome faucet will dress up your kitchen sink, and the LED filter change indicator will remind you when it’s time to replace the filters. This machine is also significantly more efficient than others in its class, reducing wastewater to an average of 2.1 gallons per gallon of drinking water.

Great R.O. system!!! its really easy to change the filters and the water tastes great! We got the system to make Kombucha and water kefir (which will die in water that has chemicals in it) and have not been disappointed.

by J.B.

Say hi to the Waterdrop’s WD-G2-B model that will make every drop of water you drink fresh. This reverse osmosis filter delivers an impressive flow rate of 600 gallons per day and a tankless design, which helps you save space while also contributing to the filter’s high flow rate. You can replace the filters in 3 seconds thanks to the twist-and-pull mechanism.

I like the fact that it's tankless doesn't take up a whole lot of space. Install was a breeze all hardware is included valves water line and all. Very quiet.

by Muss

You can enjoy all the tasty, clean water you want with this tankless RO system in a fraction of the time and space you’d spend with other devices. The NU Aqua Tankless 600 RO water filter offers excellent performance, attractive features like a smart faucet, and competitive pricing. Besides, the integrated booster pump improves efficiency and allows systems to function even when water pressure is low.

It was easy to install. Quiet operation. Easy to change filters. And best of all its tankless so it takes up minimal space.

by Rod Reeves

The Waterdrop WG3-W under-sink RO system is comparable to the Waterdrop unit previously discussed, however, it has a higher GDP rate of 400 and a total of 7 filtration stages. The filters soften water while also removing over 1,000 contaminants. Furthermore, this device can be set up in only a few minutes, and the filter may be replaced in only three seconds with a single turn.

Fantastic RO filtration system. I love the fact that it is tankless and it self monitoring, it tells my TDS reading and if the filters need to be replaced by the smart tap color. ...

by WildThanks

According to Greatwell, this system produces only 1 gallon of wastewater per 1.5 gallons of purified RO water, making it one of the least wastewater-producing systems available. You’ll appreciate the innovative integrated water route design, which eliminates leaking issues, reduces interconnections, and streamlines the installation process. Plus, there are individual filter life indicators for each of the three stages.

This is AWESOME! If you are on a well and have nitrates or bacteria this is the ticket! No tank or bladder to worry about and fits under the sink. Do not need a high PSA either. Update, filters are available from Home Depot.

by MARLA BRADY

Great looking with smart features. The Frizzlife PD600-TAM3 includes a smart display panel that checks and reports on the quality of your filtered water on a regular basis. This unit is even better because it is tankless, which means it is more compact and requires less maintenance. Still not enough? It restores essential minerals to filtered water and boosts the pH to over 7.5.

Tankless is the only way to go if your considering RO for your home drinking water! I was impressed with the sleek design as well as the water pressure when compared to my old RO tank system. Installation was easy, incredible tasting water no flows out of my city tap!

by Skylar

This high capacity tankless reverse osmosis purification system’s on-demand output capability makes it an ideal solution for large families or light commercial use in small restaurants, beauty salons, offices, or any small business. Besides, the revolutionary dual-flow membrane in the RCS5T generates RO water at a rate of 500 gallons per day while maintaining a top-of-the-line waste to pure water ratio of 1:1.

I 'installed' this as a portable unit. Once I hunted down a suitable hose bib it works as I intended. It takes 3 mins an 15 secs to fill a gallon jug with water that reads 14 TDS. My orchids are happy.

by David

The Hydro-Logic 31023 is indeed a high-flow tankless reverse osmosis system with a daily production capacity of 1,000 gallons, making it ideal for medium to large hydroponic businesses. Two RO membranes, one KDF/Carbon material filter, and all necessary fittings are included in the unit. Furthermore, with a waste-to-product water ratio of 1:1, you can conserve even more water.

I’m in the Reverse Osmosis business! This is an excellent system. Very easy to install works well! I will buy again

by Rich