Adrian Alex wrote: why we can't we just invent simple methods for a simple way of living, press a button get some hot water, no systems that require maintenance, etc. Any idea is welcome. Thanks . Adrian
There is something that comes close to what you describe:
It's called being hooked up to the grid, and using electricity or natural gas to heat your water. lol
But to be 100% honest, technically, what you seek doesn't exist. ANYTHING requires maintenance, etc. Even on grid water
heaters require maintenance, like draining, flushing, etc, (which few do, and their systems wear out prematurely and need to be replaced.) The point is, a "maintenance free" doesn't exist with ANYTHING. Not your car, house, tools, even your body. You don't maintain something, it will fail prematurely.
Ok, in all seriousness, look into a rocket mass hot water heater. I've seen a few of them
online, and those who have them seem to report that they work well,
Is it as "simple as pushing a button to get hot water?" No. You have to make a fire, usually about 30 minutes or so before you want to use the hot water. But they are an inexpensive, relatively easy way to get hot water off grid without using electricity, gas, etc.