We have a Spectra Newport
700. Around 100 liter/hour.
The big size is great.
One reason is that if you are in a dirty bay, you have to go to sea for cleaner water for a shorter time.
Furthermore, when sailing a cat above 3-4 knots your watermaker will suck air, and that is not good for watermakers. Recently, we sailed from one dirty bay to another dirty bay, so we had to make water underway. We sailed downwind without sails
. This kept the speed at 3-3.5 knots. Good to have 100 l/hour then.
The feature of automatic flushing
is great. We are now stuck in Europe
due to Coronavirus and can't go back to the boat. It is not pickled, and flushing
automatically every 5 days. We have sometimes done this for 2 1/2 months. Hope we can get back soon.....
However the Spectra is a complicated and expensive machine. When we bought the boat in 2014, this 11 year old Spectra turned about to be almost destroyed by the "professional" service
in various countries. I had to rebuild
it completely over the course of some years to get it back to factory spec. Total effort around 40 full days. Now I know almost everything about it. And the repair was much cheaper than a new one.
It is complicated and very technical, and more parts
means more failures. OK if you are a technician yourself. Expensive and very frustrating when you depend on people fixing it for you.
Alternatively: If you put 1500-2000 W of solar
on your boat, and are in the tropics, you have so much power that you can also manage with an extremely simple energy-wasting standard watermaker, which will almost never fail. But much less liters per watt.
, AC motor
, Cat or other 3-cylinder pump
. Look on the internet
for "build your own watermaker". Even if you don't build one, you learn a lot from that article.
It will be noisier. (The Spectra is quiet)
The Schenker has smaller pumps, which are converted fresh water pumps running at increased pressure. I understand they have wear, just like the Spectra's Shurflo pumps. Our Spectra Newport
700 has an AC motor
with longer-life vane pump
from Procon. A friend with a Schenker is studying how to convert his Schenker to a similar pump, to avoid the pump wear issues. I would suggest you to enquire about the pump wear issue, I have it just from hearsay.
By the way, this same friend has an interesting trick. The brine water goes out through a filter housing IN REVERSE. He flushes his used filters while making water!
Learn to know and love your watermaker!