Tankless RO Systems
Produce purified water on demand and usually use a slimmer cabinet footprint. Most require a nearby electrical socket for the pump and monitoring functions.
Read the tankless RO guide →
Undersink Reverse Osmosis Systems
Purified Drinking Water, Direct from Your Tap
Find the Right Under-Sink Reverse Osmosis System
Compare compact, tankless, high-flow and remineralising RO systems for UK kitchens. Every model sits discreetly below the sink and supplies purified water through a dedicated drinking-water tap or compatible 3-way tap.
Fast Free DeliveryUK-wide delivery with no hidden fee
Expert Product SupportClear advice before you choose
Hassle-Free ReturnsSupport if your plans change
Ongoing CareHelp with filters and maintenance
Start with What Matters in Your Kitchen
Do not choose on filtration-stage count alone. Cupboard space, dispensing speed, water efficiency and replacement-filter cost will make a bigger day-to-day difference.
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Compact Kitchens
Prioritise a slim tankless unit or an integrated tank system when cupboard space is limited.
G3P600CROSS SoloRO-101S
View suitable systems →02
Busy Family Kitchens
Choose a higher-output direct-flow system for faster filling and frequent drinking or cooking use.
Hommix 800X12X16
Compare higher outputs →03
Remineralised Water
Look for a dedicated post-filter that adds selected minerals after the RO membrane.
PD600-TAM3PX500CROSS Balance
View remineralising models →04
Simple Non-Electric RO
Traditional tank systems can operate without electricity and provide stored purified water on demand.
RO-101SERO385
View storage-tank systems →
Use the collection filters to narrow the range
Browse All RO Systems
Filter by system design, daily output, power requirement, manufacturer and water enhancement.
Tankless or Storage-Tank RO?
Storage-Tank RO Systems
Store purified water in a pressurised tank ready for dispensing. They can be a strong fit where electricity is unavailable, but require room for the tank.
Read the storage-tank RO guide →Shop Under-Sink Reverse Osmosis Systems
Compare the full collection below. Product pages include specifications, filter schedules and compatibility information.
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Kinetico Kinetico Ruwa 600 GPD£359.99Kinetico Ruwa 600 GPD Compact, Tankless Reverse Osmosis for Modern Kitchens The Kinetico Ruwa is a direct-flow under-sink reverse osmosis ...
View full details£359.99 -
Kinetico Kinetico Mynder 600 Under Sink RO System£329.99Kinetico Mynder 600 GPD Smart, Tankless Reverse Osmosis for Modern Kitchens The Kinetico Mynder 600 is a compact direct-flo...
View full details£329.99 -
Kinetico Kenda Reverse Osmosis with Hydrogen£999.99Kinetico Kenda RO with Hydrogen Reverse Osmosis Purification with Molecular Hydrogen The Kenda combines high-capacity rever...
View full details£999.99 -
Frizzlife Frizzlife 1000 GPD Tankless Reverse Osmosis Water System£630.00Frizzlife PD1000-TAM4 · high-capacity tankless reverse osmosis Fast under-sink RO performance with alkaline remineralisation The Fr...
View full details£630.00
Complete Reverse Osmosis Guide
Understand how RO works, what affects performance and how it compares with other forms of water treatment.
Continue Reading →RO Systems and Waste Water
Learn why concentrate water goes to the drain and which specification helps compare system efficiency.
Continue Reading →RO Water vs Bottled Water
Compare convenience, storage, plastic waste and longer-term ownership considerations for UK households.
Continue Reading →Under-Sink Reverse Osmosis FAQs
What does an under-sink reverse osmosis system reduce?
An RO membrane is designed to reduce a broad range of dissolved substances. Exact reduction performance varies by model, membrane, water conditions and certification, so check the individual product specification for the contaminants most important to you.
Does reverse osmosis remove limescale?
RO substantially reduces the dissolved minerals that cause scale in the purified drinking-water line. It does not soften the rest of the home because an under-sink system treats only the water supplied through its dedicated outlet.
Is a tankless RO system better than a storage-tank system?
Not automatically. Tankless units are usually neater and provide direct flow, while traditional tank systems can operate without electricity and store water ready for use. The better option depends on space, pressure, power and demand.
How often do RO filters need replacing?
Replacement intervals vary by system, water quality and usage. Pre- and post-filters commonly need changing more often than the RO membrane. Follow the schedule shown on the individual product page or in the manufacturer’s manual.
Can an RO system connect to a 3-way kitchen tap?
Many can, provided the tap has a separate filtered-water pathway and the connections are compatible. Check both products before ordering or ask us to confirm the combination.
Do under-sink RO systems require electricity?
Most direct-flow tankless systems use an electric pump. Several traditional storage-tank systems work from mains water pressure without electricity. Check the power requirement shown for each model.
Does Regal Flow provide installation?
Regal Flow does not employ an in-house installation team. We can offer product guidance and may be able to introduce an independent installer depending on your location.
Friendly Expert Support
Need Help Choosing the Right RO System?
Tell us your cupboard dimensions, household size, incoming water pressure and whether you prefer a tankless, non-electric or remineralising system. We will help you narrow down the right options.
Contact Our Support Team