That is a fair point and a reason why two compartment monstrosities even bigger yet exist, for two temps.Is the plan for this sort of spa to only be hot tub temp in the winter then cool it down for the summer for swimming? Or, are you gonna be doing heated swim workouts ala hot yoga..? Because that sounds awful
But it’ll have a cloud control app for Wi-Fi control of the heater (also important so that it sticks to 7 cent/kWh off peak rather than 22 cent/kWh peak rate electricity as much as possible). Per the manual it’ll take 6-12 hours to raise the water temp from the minimum 80F to more normal hot tub temps. I can set it to only heat above 80 on the weekends and perhaps some intermediate 90s temp is tolerable for all activities?
It requires a 240V 50A circuit so the heater is probably a 6 kW unit or so to allow for some power for the pumps and (negligible for the) controls.
edit: from perusing replacement part listings looks like they use 5.5 and 4.0 kW heaters variously. So I was about right.
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