It's true you never run out of water. You could shower for 5 hours and still have hot water.
They are providing a continuous feed of hot water the second you turn on the tap. However that hot water is starting out at the tank less unit so if your tank less unit is in one corner of the basement and you are trying to feed you bathroom on the top floor on the other corner of the house. It will take a bit of time to get the hot water.
Having a recirculation line with a tank less unit is a huge help in solving that problem.
But there are many variables. How the water lines are run, type and size of unit. Making sure it is installed correctly
(Happens more often then you would think)
Undersized gaslines are one of the biggest issues.
Also not all brands and models are created equal.
That being said I would have one in my house if I could afford to put one in.
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