The power requirements of San Fernando Valley spas and hot tubs vary. The smaller units are simply plugged into a 15-amp, 120-volt ground fault circuit interrupter (GFCI) outlet, while larger units may require 240-volt, 50-amp power to power their pump motors and heaters. In the access panel mounted on the side of the unit, a junction box is hardwired to these larger units. For easy maintenance, some models feature a removable panel or door that gives you access to the pump, wiring, and control.