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The point of a whole house unit like this is to heat water only when it's called for. Constantly heating a whole tank of water all day long when nobody's home isn't efficient.

Wow, $989. I got a similarly sized heater in Taiwan from Sakura for less than $200.

I think the us market heaters must have more temp control. My heater only controls the gas flow and beyond that, only shuts down if the outlet temperature gets too high. Since everyone uses these in Taiwan, all the fixtures are designed to flow the same, so the heater doesn't need to have great output temp control. Here in the us, nothing is designed with the same flow, as a tank heater will always deliver the same temp. Probably the US instant heaters have to account for this.

We just go adjust the heater before we use what we're gonna use.