If you have a lady aboard, then I would keep it. My wife ABSOLUTELY loves it when I heat some water for her. If you know what I'm sayin
A very viable option is a solar shower
. You could heat water in a garden sprayer painted black. The sun is strong enough down here to heat the water twice in a day (water for dishes, water for a shower).
However.. If you have a water maker already installed. Then I wouldn't pull it out. That seems silly. Especially if the heater is hooked up to a motor