Seawater desalination for a boat or off-grid setup costs anywhere from under $5,000 to over $25,000 in Australia, depending on the system type, output, and whether installation is included. This guide breaks down every cost category honestly, so you know what to budget before you buy.
What Drives Seawater Desalination Cost?
Three things set the price of a marine desalination system: the pump technology, the output in litres per hour, and whether the unit needs to be installed. Portable 12V systems sidestep installation entirely, which removes a large slice of the total cost. Fixed or built-in systems need a plumber or marine electrician, hose runs, seacocks, and dedicated cabinetry, all of which add up quickly.
The other cost driver is brand origin. Many European watermakers carry overseas distributor fees and international freight on top of the hardware price. Australian-made units like the LEDI Scout avoid that markup because they are built on the Gold Coast, not imported.
Purchase Prices: Portable Watermakers vs Installed Systems
Portable 12V units are the most affordable entry point into seawater desalination. Here is how the categories compare in 2026 AUD:
- LEDI Scout (portable, 10 or 20 LPH, 12V DC): from $4,899 for the 10 LPH model, $5,799 for the 20 LPH. No installation required. Drop the intake over the side, connect the hoses, and you are making water.
- LEDI Nomad (portable/semi-permanent, 40 to 80 LPH, 12/24V DC): $9,899 for the single-membrane unit, $10,899 for the double-membrane. Suited to liveaboards, charter boats, and heavier daily use.
- LEDI Modular (below-deck permanent install): configuration-dependent pricing. Designed for refits and new builds where the system lives out of sight with a remote control panel and auto freshwater flush. Contact LEDI for a quote based on your output requirements.
- European or US fixed watermakers installed: typically $10,000 to $25,000 or more once hardware, freight, and installation labour are included.
The Scout in particular competes directly with fixed systems that cost twice as much, using the same commercial marine-grade parts, because there is no installation, no importer, and no distributor margin.
Running Costs: What to Budget After You Buy
Seawater desalination running costs are low if you look after the consumables. Here is what to expect with a portable RO watermaker:
- Pre-filter cartridges: The Scout uses a 5 micron 2.5"x5" cartridge, which costs $25 AUD. Replace it roughly every 10 to 20 hours in silty water or every 30 to 40 hours in clean ocean. In a typical cruising season that might mean two to four cartridges. A larger 2.5"x10" cartridge is also available for extended intervals.
- RO membrane: The membrane is not a regular consumable. With a freshwater flush after each use and proper pickling for storage, a seawater RO membrane lasts several years. Replacement cost is $330.
- Maintenance chemicals: Pickling solution and cleaning chemicals cost from $12 AUD per pack and are used infrequently.
- Power: The Scout draws 16 to 18A at 12V DC. A standard 12V house battery with 200 to 400W of solar handles it without a generator, so ongoing power cost on a solar-equipped boat is effectively zero.
Over three years of cruising use, most Scout owners spend roughly $100 to $200 on pre-filters and little else. Compare that with buying bottled water in remote anchorages or Pacific island ports, where prices and availability are both unpredictable.
Hidden Costs in Cheaper or DIY Systems
Some boaters try to build their own RO system from components to save money. The parts are available, but the total landed cost of a working, reliable system often approaches a ready-to-run unit once you factor in high-pressure fittings, a suitable pump, a pressure vessel, pre-filtration, tubing, UV sterilisation, and the time to make it all work. Non-proprietary parts on the Scout and Nomad mean field servicing is affordable, but the engineering and testing have already been done for you.
Also factor in warranty. LEDI offers a one-year warranty on every unit, extended to two years on registration, with lifetime in-house servicing on the Gold Coast. Wear parts are field-replaceable, and spares post Australia-wide and internationally, usually within one business day. A DIY build carries none of that support.
Is a Portable Watermaker Worth the Cost?
The break-even point depends on how you use it. For a crew buying three to five litres of bottled water per person per day in the Pacific, costs accumulate fast. The true cost of bottled water in the Pacific adds up to hundreds of dollars on a longer passage. A Scout at $4,899 pays for itself in avoided water purchases and marina water fees within a season or two of serious cruising.
For a boat that only sails coastal weekends with shore access, the maths are different. But for anyone doing offshore passages, spending time in remote anchorages, or exploring areas where shore water is expensive or unreliable, the value is clear.
For a fuller breakdown of what you will spend over the life of the system, see the true cost of owning and maintaining a LEDI Scout watermaker.
How the LEDI Range Matches Different Budgets
Choosing the right unit for your budget is about matching output to actual daily use, not buying more than you need:
- Scout 10 LPH ($4,899): Suits a solo sailor or couple on a trailer sailer or yacht up to about 40 ft. Run it for two to three hours a day and you have 20 to 30 litres, enough for drinking, cooking, and basic washing.
- Scout 20 LPH ($5,799): A better fit for three to four crew or a couple who want shorter run times and more reserve. Two hours produces 40 litres.
- Nomad ($9,899 or $10,899): For bigger catamarans, liveaboards, charter, or any situation where you need 40 to 80 LPH, hot showers underway, or a system that can serve multiple people continuously. The Nomad watermaker includes an integrated control panel with TDS monitor and flow meter as standard, plus 2-stage pre-filtration and DEFLOK fittings.
- Modular: For a permanent below-deck install on a refit or new build. Pricing is configuration-dependent. Contact the LEDI team to discuss your requirements.
For help sizing a system to your actual water use, see how to size a watermaker system properly.
Shipping and International Orders
Australian shipping is calculated at checkout. LEDI ships globally, but for international orders outside Australia, contact the team directly for a shipping quote: info@ledi.com.au or +61 494 562 668. New Zealand customers can also read the watermaker New Zealand guide for specifics on ordering from across the Tasman.
Frequently Asked Questions
How much does a portable seawater desalination system cost in Australia?
The LEDI Scout starts at $4,899 AUD for the 10 LPH model and $5,799 for the 20 LPH. The LEDI Nomad, suited to higher output needs, starts at $9,899 AUD. Fixed installed systems from European brands typically cost $10,000 to $25,000 or more including installation.
What are the ongoing running costs of a watermaker?
The main consumable is the pre-filter cartridge, which costs $25 AUD and is replaced every 10 to 40 hours depending on water quality. The RO membrane is not a routine consumable and lasts several years with correct flushing and storage. Power draw on a 12V system is covered by a modest solar setup, with no generator required.
Does the price include installation?
The Scout and Nomad are portable units, so no installation is required or included. The price covers the complete ready-to-run unit. For a permanent below-deck install, the LEDI Modular kit is the right option, and pricing depends on the configuration. Contact the LEDI team for a quote.
Are there extra costs for spare parts or servicing?
LEDI offers a one-year warranty (two years on registration), and all spare parts are available from the LEDI spares store. Parts use non-proprietary, off-the-shelf standards, so they are affordable and serviceable anywhere in the world. Lifetime in-house servicing is available on the Gold Coast.
If you have questions about which unit suits your budget and use case, the LEDI team is available directly at info@ledi.com.au or on +61 494 562 668. You will speak to a real person, not a call centre.
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