I know nothing about dreammaker but lived in a house with a 110V hot tub (outside). I found it to be useless when the weather outside was cold (Kentucky winter) as the heater didn't run while the jets were on. It was always cold after about 20 minutes of use.
In other words, if it were me, and 220V wasn't an option, I'd opt for not having a spa.
Sorry if that wasn't useful, but just wanted to be sure you knew what you could be getting in to.
E