We have two water tanks a 25 gal and a 30 gal. Water isn't an issue for us because we usually not more than 4 hours away from a fresh water supply. When one tank goes dry we refill it when we get back to our marina. So we take longer showers than we really should. I would estimate (from the dewatering of the tender) that we use about 4 gals per shower. Bigest problem is hot water. We have a 6 gal hot water heater and if my wife gets her shower first mine shower is a little cool. Maybe she plans it that way.
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