Hot Tap Water...Faster

Hey Colorado... are you a 420 blaze it kind of guy? They have been using these on demand systems almost exclusively for years and years in the European Theater. Don't know where the big *** water storage tank idea came from in the west. I believe it's short sighted economics that play the part here in america. Big is cheaper to install but costs more in the long run. A lot more. As far as sediment...... Ha!!!! The water moves through the pipes as heated and creates no sediment. Hard water issues I'm unsure of, but I have had no trouble with mine for over ten years and it cut my bill by almost $40 a month, and would be even cheaper if it wasn't all electric here.
Also, they have systems that are constant recycling systems that give instant hot water but they cost more because the water is constantly cycled. Your idea would also require a way to increase the water pressure over what your cities system provides. More moving parts and more things to go wrong. Wait.... Your on to something. More maintenance for an upgraded system creates more jobs. Your a genius. Somebody needs to run with this.
Your idea does have some merit but I wouldn't try to feed new lines thru old. Maybe just add sleeves in the long straight runs to decrease volume within the pipe. Bypassing the problems of turns and tee's.