Sunshowers may seem basic, but their utility shouldn't be under rated. Water can be warmed in the sun, or you can easily warm water on your stove. They are inexpensive and prevent anyone from using up most of your water tank water. They can be filled before a short trip and will conform to oddly shapped places including the bilge, so it enables you to bring more water, rather than stretch your tank water further.
Regardless of what delivery
system you use, if people shower inside, you should install a proper shower sump as mentioned in above posts. Letting wash water drain into the bilge can cause all sorts of trouble. If you decide to use your boats water tank, you can install a head sink tap that comes out to be used as a shower or install a separate shower tap. Make sure it turns off easily or people will waste water. I prefer one that actively needs to triggered open if using a pressurized water system.
Even though I have shower factory installed in my Beneteau
, I rarely let people use it. The issues of clogged sumps, high water use, wet toilet paper, and humidity in the boat just are not worth it considering the cockpit
is more spacious, was designed to drain water and has an ocean load of salt water
readily availalble. I realize, of course, climate and your wife's temperment come into play.