I am pretty ignorant about watermakers but would be interested in what you have on your small boat. What does it cost to buy/install and what does it take in power to operate and how much water does it provide? I ask because fresh water was always a premium on boats I've owned. When sailing I carried a couple extra 5 gallon jugs. Current boat carries 40 gal which is enough for about 3 days/nights for the 2 of us (some goes to the freshwater head). I'd love to have a watermaker but always assumed that was for bigger boats than mine
I was fortunate enough to be able to purchase a Katadyn40. She is small.
After the thru hull there is one of those dinky little pretend screen filters a bit smaller than a cup. Next is an inline 10" whole house style water filter with a clear housing. This is not Required though it was Recommended.
This 30 micron filter will be swapped out every couple days. Thus, having easy access is critical. Also note that when red tide hit here, the filter turned black (BLACK!!) overnight. Ugh.
Normally backinblue I swish out the used filter in the water (Gulf of Mexico) and hang it in the sunlight to dry. I swap out a pair of filters every few days, using the same two for months.
Next water goes into the membrane pump. 15" or so long with a pump at the bottom. Water leaves the pump and there is a valve. One way goes into my sink in the head. When I first turn on the pump it smells salty/dank. It drains into my sink. Once the water is clear/fresh I swish out the sink with soap, so no issues with rust.
About 10 minutes later there is no odor. Sometimes I check with my TDS meter. Total Dissolved Solids number will be at 150. Water from the city tests at 250ppm, so my water is cleaner than city stuff.
The Katadyn40 i bought included the full rebuild kit, and the world cruising kit. It was $3000 and that price included installation. I bought from a friend.
I chose this unit specifically because it runs off 12v. She puts out 1.5 gallons of water per hour, using 4aH.
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If I had the space and power I might have opted for one of the larger 120v ac versions. Those provide a lot more water in less time. For me, this is ideal. The power consumption and fact that 12v is sufficient was an Important criteria in my decision. Just getting Katy was serendipitous. A generous reader donated to me via PayPal, and at the same point Ken asked if I still wanted to buy his watermaker. Because I had a down-payment available in PayPal I was able to secure the watermaker.
Truly this changed my life. Hauling water was exhausting. Now, except for right now (red tide has been here for 3 weeks so...) I turn on the Katadyn40 for a little while each day or two. A fellow wrote a how-to and I've been following his rules (use prefilter, swap filters) without issue. He's the real expert.
Financially the watermaker is not a good idea. Except that it is so worthwhile I cannot imagine going back to living without one. I love mine.
I would suggest starting a thread though as there are some great units available in the same price range or less that put out more water. Mine is older and newer are generally more efficient.
And, are you sure your tank holds 40 gallons? I ask because Seaweed supposedly held 30. When I first bought her I took a gallon jug and started to fill her. I remember thinking that if she held 50 gallons I would never measure one gallon at a time. Still, I wanted to be sure that at a dock I wouldn't be overcharged for water. So I counted... 50 gallons. Yep. Her stats said 30, however she holds 50.
Now that I have Katy showers are frequent, and I wash my hair almost every day. I wash clothes in fresh water. My life is terrific. The watermaker is a big part of that. I am so appreciative that a reader donated at just the correct moment so I could secure the Katadyn40. I am truly blessed.
Life aboard Seaweed is amazing, though I probably should have named her Theory. Everything works in theory. (said while sming)