I have an on demand system and it is effing amazing; Relatively constant temperatures, unlimited water, runs the shower (2x2GPM heads), the dishwasher and the washer at the same time.
I also love that my on demand has a recirc feature built in, so I have instant hot water upstairs, when in a normal house it could be 60+ seconds to get hot water!
Such a nice luxury. If you're replacing, I'd suggest tankless for the recirc (assuming that's retrofittable - i don;t have return lines from my taps, so I assume it is)
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