Over 25 years ago my wife and I build an oversized home and we had an instant water heater installed.
It did live up to its name we had instant hot water through the house, but we did run into one problem.
We had also installed a large tub that should had been listed as a small pool, by the time half of it was fill the water would turn cold.
Since I do not know the first thing about instant water heaters, I can't tell you if this is a problem with all instant hot water heaters or it was the way ours was installed.
But before you go forward with this find out if there is a capacity level.
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