Water Maker Installation: 1997 Hunter 40.5

SV Gypsy Wind a 1997 Hunter 40.5 all ready to head South to Mexico and Beyond on the 2013 Baja Ha-Ha Cruisers Rally

The bulk of the water maker is installed in a hanging locker.  High Pressure Pump, prefilters, and the valving and cleaning assembly.  To save space, the two 3-way valves were removed from the Activated Carbon filter and mounted remotely.  A nice easy idea.


Remote panel mounted outside the locker.  Most of our panels come with switches for the Hp and Boost pumps, so this panel is not standard.


Due to space limitations, the client could not use our standard 40″ (SW30-2540) RO Membrane, so we used a 21″ x 4″ Membrane to save space.  These SM30-4021 Membranes are more expensive and have flow limitations to consider but with  large enough Hp Pump they can be a good solution for a tight installation

With Marine Watermakers: Size Matters

I will be the first to stand up and say that I LOVE my job. Where else would I get to work from the lower salon of my sail boat from whereever I am and talk cruising and watermakers with friends and clients.  But I will also admit that my work schedule is more of a lifestyle than a Job.  The 7 day a week work schedule does sometimes wear me down.  Then an email comes in from a client and makes all the hard work, late night emails and Saturday client communications worth it!  Sure it may be considered bragging when you share a favorable client water maker email, but the truth is we all like to get a pat on the back from time to time to help keep us smiling at 11PM while working on a Friday night!


“I commend you for your commitment to your product and your customers.  I had intended on getting a 12 volt watermaker system until talking with you at the boat show. I have never regretted getting an AC system. Many friends run their 12 volt units for several hours to fill the tank, while monitoring/augmenting battery amps. That is a lot of wear on the components for a little water. One friend recently missed an outing with friends in the San Blas Islands because he had to stay aboard and run his 8 GPH DC watermaker for several hours to fill his tanks. We did a passage with them, and it seemed that the sound of the watermaker was nearly constant during daylight hours, while underway. I never run mine for more than an hour, getting the amps from the main engine, my Honda generator, or shore power.  I have made more than 1000 gallons of water so far, with only 37 hours of run time.”

Lane Scott
La Paz, Mexico
SV Adesso

Water Maker Hose Run Lengths



A benefit of a modular sailboat watermaker is that the individual water maker modules can be mounted as far apart or as close together on your boat as space dictates (I’m assuming you don’t have a 300ft Mega Yacht and want to spread the Modules from stern to bow).  A plumbing run of 10 feet between the modules will not have a negative effect on system performance.  We oversized the sea water boost pump to supply the high pressure pump, which makes sure your high pressure pump gets plenty of sea water flow.


All SeaMaker water makers come standard with 30ft of low pressure sea water inlet connection tubing, 30ft of low pressure brine discharge tubing and 30ft of low pressure fresh drinking water tubing.  For the high presure connections on the water maker, we provide a 3ft and 5ft high pressure hoses to connect high pressure pump to the RO membrane pressure vessel assembly and then to the remote panel.  Although we have found that most water maker installation can use these standard high pressure hose lenghts, we can supply two 30ft high pressure hoses without a loss in system performance.



Converting a Spectra to a Cruiser RO Water Maker

After years of operating their Spectra DC water maker, Tom contacted Cruise RO Water Makers to talk about converting their Spectra water maker our concept of a “Keep it simple” high output AC 120V unit.

Dear Rich,
We replaced the membranes supplied by you in November 2013 in our Spectra Newport 700. We are now considering replacing the unit with one of yours and I was hoping to use some of the Spectra parts that we already have. We have the seastrainer, 50,20,5 micron filters, FWF filter, pressure vessels ( 2 @ 40″ ) and membranes. I believe we would need the boost pump, high pressure pump and motor and the control panel. Could you provide us with a price to make this conversion and any comments you may have.
Thank you,

Tom’s project highlights the truth that all marine water makers operate on the same principal of delivering a flow of high pressure sea water to a Reverse Osmosis membrane.  The sea water first needs to be prefiltered to remove solids before sending it onto the high pressure pump.  Our water makers use an industry standard stainless steel piston pump to generate the pressure while a unit like Spectra uses a proprietary energy recovery Clark pump.  We control our water maker with manual valves while a unit like Spectra uses electronic controls.  When you strip things down to basics all marine water makers operate on the same basic design criteria but have different approaches to put the principals into practice.

Being a cruiser owned company where the owners and designers answer the phone calls and emails, it is common for us to integrate our parts and “KISS” design concept into other manufacturer’s parts and systems.

As a growing number cruisers are coming to the realization that they need to run their generators to keep up with the power demands of their low output 12/24v DC water makers many are deciding to upgrade their water maker.  As an example, if your 12/24v DC water maker uses a single 40″ RO membrane an upgrade could turn your low output unit in a 20 Gallon per Hour water maker or if like Tom you have two 40″ RO membranes you can have a 30 gallon per hour water maker!

Dear Rich,
With your help we finished the conversion our Spectra Newport 700 water maker on our 48 Krogen to your unit.  We did not use anything electronic since we wanted to use your approach to simplicity. As you can see by the photos the system is simple and easy to service. We are looking forward to many years of trouble free service.