I built a huge porn shower i plan on being a steam sauna with seats in our master bath. I would like hot water for the shower heads to last as long as i can get it. Battling with the main house line and teenage kids in their part would be an issue with one tank. Im not apposed to over the top ideas. Im thinking a heated tank and in line heaters just for our bath . She is getting a washing machine in her walk in closet that will take hot water from this as well but wont be running while the shower is in use. Im all electric but gas isnt out of the ? Ohio winters suck and we plan on spending a good deal of time in this thing so i need it to be over built. Ideas?