I hope that potential customers are thinking they're getting a $8K spa for $5K.
110V
1 pump
Small heater.
Yes you can upgrade the model, or if you'd like, here are some of the HS dealership line...
The Highlife will run equally well on 220 or 110: It comes set up for 110, but can be easily converted. You don't have to buy anything, but the subpanel which all HS dealers have usually saves time and money. Don't want to buy it? No problem. Just run two circuits, GFI protected, to the tub. You can put two GFI breakers in your main panel, or go buy a subpanel and some breakers from the local supply house. The tub heats much faster on 220, not usually an issue since most folks leave the temp set, and the jets remain the same on either voltage.
The Highlife has Two pumps: one jet pump and one circ pump. Not a giant jet pump, but as we all know, it has a diverter so you don't run all the jets at the same time. That is the price paid for the ability to run dual voltages. Tubs with larger pumps may run more jets at the same time, but can only be wired 220.
The heater is 1500 watts on 110 volts and 6000 watts on 220 - again, converting is not a hassle and you don't have to buy anything to do it. And it can be converted either way at any time.