There should be some kinda compromise for a minimalist system. In Texas
, I rarely use the hot water anyway, but pressurised water, (at least to a couple of sinks, and a shower
, (or cockpit
washdown), is very handy. I mostly do coastal cruising though so a long passage
with limited tankage may want to have manual pumps to conserve water.
IMO having the switch at the point of use, (wiring is easier than plumbing), and making it a momentary pushbutton, (so you have to hold it down), will also save water, and allow for future upgrading.
A small pressure pump isn't much different in price
than a manual pump. And you only need one in the system. Hot water can be added later by a small inline heater.
Small camping units are made by Coleman, that are propane
powered and also have a small tank, plus pump. And can be added or upgraded anytime without redoing the plumbing
My goal in a situation like this, would be to get a working, (workable), system as quickly and cheaply as possible, but that will be able to upgrade without tearing out what I have built so far.
IE plumb cold water system from tank to point of use, but install tees, and cap off for future hot water addition. Later just remove caps, and plumb in hot water. 1/2 cost for initial cold water only system, but not trapped into redoing when upgrading.