The previous owner of my boat had a really good unit (forgive me for forgetting the brand) that he had mounted on the bathroom sink. Yes, I know, an eyesor but maybe it can lead you to some ideas, it was plumbed to the seacock in the bilge near the starboard pullout setee close to the mast and the brine discharge was the head sink drain.

I could contact him to see if he would dig it out of his storage and sell it.

I believe it to be a good unit that kept the tanks full.

I did see it before I singned the papers for the boat.

Carl

Wow, do you mean he actually had it ontop of the bathroom counter?  Or do you mean in the cabinet space behind the sink?  I wonder how that would work.  

The Spectra is modular and the components can be installed separately. If you buy a used water maker be aware the industry says avg. life span for a membrane is six years.  They will go longer the more they are used.  Six to ten years is doable with constant use.  Ours has been pickled for the last three years and may need to be replaced at @ $600.00.  We choose Spectra primarily do to the best power consumption.  It's real important to us not to run the motor to charge the batteries. At 15 amps our solar panels can almost carry the water maker load during operation. The engine room is the worst place to put it as the membrane starts to seriously degrade at temp. above 125 degs,

Jim

They prefer you not to as it requires new high pressure tubing.   

I would make the water maker the last item because the membrane starts to deteriorate as soon as it comes out of the factory, in use or not.  Also you might consider the Spectra Ventura which is smaller in size, also production.

Jim