The first thing is to determine what spa sizes you are considering. Some spas do not offer the option of 110v service. It also depends on how you plan to use the spa. Basically, having a spa hooked up for 230v service means that the jets and the heater can operate at the same time. With a 110v unit, the heater will not come back on until you turn off the jets. If your new spa is going to be “party central” with several people in and out of the spa over a few hours, you might be happier with a 230v hookup. If your spa is going to be a quiet refuge for one or two people who enjoy a hot water soak with no jets, then a 110v unit might be best. Also, you need to consider whether you are installing your spa indoors or outdoors and whether you plan to use it year-round. Since many different factors go into this decision, give your dealer or Hot Spring Consumer Service team a call before you buy. We’ll be glad to provide the information you need to make the best decision for your spa enjoyment.