One of the most common objections I hear from customers is:
“I would like a reverse osmosis system, but I simply don't have enough space under my sink.”
After installing water treatment systems since 1997, I can confidently say that in most cases the problem is not the lack of space—it is finding the right installation solution.
Modern kitchens come in many different layouts. Some have large cabinets under the sink, while others use pull-out waste bins, corner cabinets, or compact drawer systems. Fortunately, there are several proven installation methods that allow homeowners to enjoy clean drinking water even in challenging spaces.
Here are eight practical installation solutions that I have successfully used in real homes.
1. 80 cm Cabinet with a Double-Bowl Sink
This is one of the easiest installation scenarios. The large cabinet width provides enough room for both the filtration system and the storage tank while still leaving space for cleaning supplies and waste bins. Most reverse osmosis systems can be installed without any modifications to the cabinet.
2. 60 cm Cabinet with a Single-Bowl Sink
Although the available space is smaller, modern tankless systems fit very well in this type of cabinet. High-capacity systems equipped with booster pumps and membranes above 600 GPD are particularly suitable because they eliminate the need for a storage tank.
3. 80 cm Cabinet with a Single-Bowl Sink
This configuration offers excellent installation flexibility. The large cabinet width combined with a single sink bowl leaves significant free space for both traditional and compact reverse osmosis systems. In most cases, all system types can be installed comfortably.
4. Pull-Out Waste Bin Cabinet (Low Plinth Installation)
Some kitchens use pull-out waste bins that occupy most of the cabinet space. When the plinth height is sufficient, a slim tankless reverse osmosis system can be installed underneath the cabinet behind the decorative kickboard. This solution preserves the waste bin system while still providing purified drinking water.
5. Pull-Out Waste Bin Cabinet with Compact Tankless Systems
Certain compact reverse osmosis systems are specifically designed for narrow spaces. Their slim profile allows installation beneath cabinets with limited clearance, making them a practical option when conventional systems would not fit.
6. Pull-Out Waste Drawer Converted for Filtration Use
In some kitchens, customers choose to remove the waste drawer completely. The available space can then accommodate larger reverse osmosis systems, storage tanks, mineralizers, or even ionizers. This solution is ideal for homeowners who prioritize drinking water quality over storage capacity.
7. Corner Cabinet Installation
Corner cabinets often provide more usable volume than many people realize. These cabinets can accommodate large filtration systems and storage tanks while keeping all components hidden from view. They are particularly useful when standard sink cabinets are already occupied.
8. Installation in an Adjacent Cabinet
When there is no available space under the sink, an adjacent cabinet may provide the perfect solution. Water lines can be routed through a side panel, allowing the filtration system to be installed in a neighboring cabinet. This approach works especially well with modern tankless reverse osmosis systems and often provides easier service access in the future.
The Most Important Lesson
After thousands of installations, I have learned that the question is rarely:
“Can a reverse osmosis system fit?”
The real question is:
“Which installation method is best for this kitchen?”
Modern reverse osmosis systems are available in many different sizes and configurations. With proper planning, even kitchens that appear to have no available space can often accommodate a highly effective water filtration system.
In many cases, the solution is simply choosing the right cabinet, the right system, and the right installation approach.
Clean drinking water is often much closer than homeowners think.
These are only general examples of possible RO installation solutions. In my upcoming book, “Water Filter Installation Guide – For Installers and Service Technicians,” I describe each installation variant in much greater detail, including technical drawings, cabinet layouts, system compatibility, real installation photos, and practical installer’s notes based on field experience since 1997.
Author: Piotr Żukowicz
Water Treatment Installer and Service Technician since 1997
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