When Does It Make Financial Sense to Install a Watermaker on a Catamaran?

Catamarans get through more fresh water than most boats of the same length. Two hulls usually means two heads, more showers, wide decks to rinse and often a bigger crew aboard, so the question of whether to fit a watermaker becomes a financial one as much as a practical one.

Below we look at what actually goes into the numbers, where the savings turn up across a cruising season, how your style of sailing changes the payback period and the kind of value that never quite fits on a spreadsheet.

What Goes Into the Numbers

Three figures matter here: the purchase and installation cost, the energy needed to run the system and the routine servicing that keeps it producing. Consumables such as filters and membranes are predictable, which makes it easy to build them into an annual cruising budget.

Installation on a multihull is usually one of the more straightforward jobs on the list. There is real space in the hulls and lockers, plumbing runs are short, and modular units can be split across compartments so nothing has to be squeezed into a single tight corner.

Energy is the figure that has changed most in recent years. Energy recovery designs have cut consumption sharply, so the large solar array that most cruising cats now carry on the coachroof or davits can often handle a daily production session on its own.

Where the Savings Turn Up

Dock water is the obvious one. In popular cruising grounds such as the Bahamas and parts of the Caribbean you can pay 30 to 60 cents per gallon, and that is before the slip fee for the night you spend alongside just to fill your tanks.

Bottled water adds up faster than most crews expect. A family of four drinking bottled water through a season can spend several hundred dollars, plus the dinghy fuel, the jerry can runs and the hours of a good sailing day given over to hauling containers back to the boat.

Weight is the saving people forget. A catamaran is sensitive to what you load into it, and carrying full tanks everywhere costs you performance and fuel. Producing water as you use it lets you sail lighter, which shows up in your fuel bill over a long season.

How Your Cruising Style Shapes the Payback

Liveaboards and long distance cruisers see the fastest return. When you can anchor freely instead of booking marina nights for water, the savings stack up quickly, and crossing an ocean without rationing showers changes the whole experience of the passage.

Charter operators work to a different set of numbers again. Back to back turnarounds, guest showers, laundry and deck rinsing all demand water on demand, and a boat that never has to interrupt a charter for a water stop earns more days on the water each season.

If you sail seasonally from a home marina with cheap dock water, the math simply runs on a longer timeline. Many owners in that position still fit a system early, because it opens up the longer trips they plan to take once the schedule allows.

The Value That Does Not Fit on a Spreadsheet

Autonomy is the part owners talk about most. Choosing an anchorage because it is beautiful rather than because it has a water tap is a genuine shift in how you cruise, and it tends to be the reason people wish they had fitted one sooner.

Resale is worth counting too. Buyers shopping for a used cruising cat expect to see a desalination system on the specification sheet, and a well maintained unit is one of the features that helps a listing move at the price you want.

Then there is daily comfort. Rinsing salt off the deck, washing dive gear, doing laundry on board and taking a proper shower after a long day all become normal rather than rationed, which matters when you are living aboard for months at a time.

In Summary

The financial case for adding a desalination system to a multihull rests on how much you cruise, where you cruise and what you currently spend on dock water, bottled water and marina nights. For most liveaboards, charter operators and long distance sailors the numbers work within a few seasons, and the comfort and resale value sit on top of that.

If you would like to see how those figures look for your own boat, our team at Eco Sistems USA can help you size a system to your hull, your crew and your power setup. Contact us for a free quote on a marine watermaker and find out what fitting a watermaker to your catamaran would cost.