Most hot tubs (of all brands) require a 240V*, 50 Amp, Dedicated service. Some of the largest hot tubs (with more than 2 pumps) will require 60 Amps. Some of the smallest will operate on a 120V, 20 Amp, Dedicated line. In fact, most 120V are "Convertible", which means they can operate on either 120V or 240V. However, this does require removing a jumper wire and changing the DIP switch settings!
It is important that copper wire be used, not aluminum!
240V installations have 4 wires: 2 Hot lines (Black & Red), a Neutral (White), and a Ground (either Green or bare copper). Download our Spa Voltage Check Guide.
Finally, although 8 Gauge wire can be used in some 240V installations, we will always suggest 6 Gauge copper wire. 6 Gauge is substantially larger than 8 Gauge and will help your motors last longer by reducing any voltage drop.
* 220V, 230V, and 240V are all the same thing, as are 110V, 115V, and 120V.