Hot Tap Water...Faster

Blind Squirrel said
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.

I've been in the military for 12 years and maintain turbo-prop engines, I have no care for weed. I thought of this idea after studying aircraft brakes, which use high pressure hydraulics, then deboosted that pressure to actuate the braking piston. Not sure what you mean by "create sediment," it's impossible to create anything that is not already there. There's always going to be junk in your water at min levels, I had simply thought that this scale, lime, calcium, etc builds up over time in an on demand system, whether it's in the heat exchanger or the heat element itself I don't know - reducing the overall heating efficiency over time.

It's good to hear people's on demand systems actually last.

As far as my design goes, the only moving part is the water pump - which is pretty simple and perfected these days. The debooster is all mechanical, as is a regulator, but to turn on the pump during a demand would take a Hobbs switch. Being able to throttle the pressure for various demands would require a more complex regulator and of course a relay.

The snaking through the pipes would only pertain to homes that have burried interior piping like multi stories. Someone with a crawl space like me it would be as simple as removing the old pipe and adding a small high pressure pipe.