Inter,
You can do the long hose setup but it is a rather quick & crude way. Not a good idea having the hose run along the length of the deck. I have safety concerns ie. slipping, tripping as such.
Also, most tanks is located aft, so you would be doubling the length of run the hot water has to travel first forward to the head area then back to the cockpit. Figure 25-40 foot total run from the tank, and you have over a half gallon of water just in the hose. With no insulation, the water temp will also have a lot of heat loss thru the hose.
Most tanks are only 4-6 gallon. Use half the hot water and the temperature drops off considerably for the remaining water. Cold water replaces the HW used in the tank.
Let's take your idea but tap into the hot & CW lines just after the HW tank, and anywhere to tap off the CW line & run to the cockpit shower fixture. I gave this info to Warner awhile back; I guess he is pondering all ways to tackle it. The more replies/info he receives, the more knowledge he will gain with which to make his choices.
Warner's orig. question was installing the shower. Then questions of tank & location on how to locate & plumb a tank for the cockpit shower. The first thing to ask yourself is how will I be using the shower, how often etc.? Figure in the expense, then how to go about it.
Sometimes it's difficult pulling all the needed info together for a project with which you have no prior experience. If still unsure, then it may be a good idea to talk to your boat friends for advice.
Warner hasn’t replied to the last 3 replies, so i'm gonna wait to hear what he decides. Great hearing from you Inter................
CR