Choosing the right RO water maker for your vessel

Fresh water is essential for everyday operations onboard. It supports crew wellbeing, hygiene, cooking, cleaning, and technical operations – but for shipowners, it is also increasingly connected to operational efficiency, logistics, and sustainability.

Built specifically for marine applications, JOWA RO systems combine compact design, reliable operation, and easy installation in a complete plug-and-play solution developed for demanding onboard environments.

Designed for marine operations

Marine environments place unique demands on onboard equipment. Limited machinery space, vibration, saltwater exposure, and continuous operation require systems that are robust, compact, and easy to maintain.

JOWA RO systems are developed as “Made for Marine” solutions, with skid-mounted plug-and-play designs that simplify both installation and commissioning.

Across the RO range, shipowners benefit from:

• Compact footprint
• Stainless steel SS316L high-pressure piping
• Automatic salinity monitoring
• User-friendly HMI touch display
• Easy maintenance access
• Communication compatibility with vessel systems
• Energy-saving options available

The systems are designed for continuous fresh water production in seawater conditions up to 35,000 ppm salinity.

Choosing the right JOWA RO system

Different vessels have different freshwater demands. Crew size, available installation space, operational profile, and daily water consumption all influence the right system choice.

JOWA RO 3.2T and 5.5T SEA – Compact systems for smaller vessels

The JOWA RO 3.2T and 5.5T SEA systems are compact plug-and-play water makers producing 3.2 or 5.5 tonnes of potable water per day.

These models are particularly suitable for:

• Smaller cargo vessels
• Fishing vessels
• Offshore support vessels
• Workboats
• Retrofit installations

The compact skid design makes installation straightforward even in tight machinery spaces. An optional energy recovery system can also reduce energy consumption by up to 50%.

JOWA RO 15T and 30T SEA – Higher-capacity systems for larger vessels

For vessels with greater freshwater demand, JOWA offers the RO 15T and 30T SEA models.

These systems are designed for:

• Large cargo vessels
• Tankers
• Offshore installations
• Vessels with larger crew complements

Despite the higher production capacity, the systems maintain the same compact marine-focused design philosophy, with integrated skid layouts and simplified operation.

The systems can also be configured with second-pass treatment for technical water production below 10 ppm.

JOWA RO Split Version – flexible installation for space-constrained vessels

Not every vessel has room for a traditional skid-mounted system.

For retrofit projects or vessels with limited access and tight engine room layouts, JOWA offers a split-version RO system. Components can be installed separately throughout the available space while maintaining the same operational reliability and performance.

This gives shipowners greater installation flexibility without compromising water production capacity.

More than just fresh water production

Fresh water production is only one part of safe onboard water handling.

JOWA’s strength is the ability to deliver complete marine water treatment solutions –from production and filtration to sterilization and final drinking water quality control.

This includes systems as:

• UV sterilizers
• Silver ion sterilizers
• Fresh water filters
• Hydrophore and calorifier systems
• JOWA Safe Water UF systems

This gives shipowners one supplier for the complete onboard water handling process, simplifying both service and spare parts management.

Built for lifecycle reliability

For shipowners, choosing a water maker is not only about production capacity. Reliability, global support, spare parts availability, and long-term serviceability are equally important.

JOWA has supplied marine water treatment systems for decades and is known for robust products designed specifically for shipboard operation.

With compact plug-and-play RO systems, flexible installation options, and complete lifecycle support, JOWA helps shipowners secure reliable fresh water production onboard – wherever the vessel operates.