Most of them area about the same when it comes to maintenance. Getting one that uses off-the-shelf parts is a much better idea than one that is all proprietary parts. I've installed and worked on one brand that is specifically designed to use off-the-shelf parts, to minimize maintenance costs.
Also, get a larger watermaker than you think you need, since they're generally far more energy efficient. For instance, if you need 20 gallons a day, it is often better to get a larger one and run it every two to three days, rather than running a smaller one every day. One reason for this is most watermakers need to be backflushed with water to clear the RO membrane. Running a larger one every other day means you waste less water backflushing the membrane.
BTW, if you do get a watermaker, make sure that the tank it is connected to is never filled with tap water. The chlorine in tap water will destroy the RO membrane in the watermaker.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.