One S2 draws about 1000 watts, so 1000w / 115 volts = 8.7 amps. So yes, a single 15 amp circuit can run one S2, but be careful what else is on that circuit... most household circuits have other outlets on them.
208v is better. 240 is better still. the closer to 250v, the better, i believe.
my power is 220-240 i assume these are volts.
i often wonder how to get the Amps of an item.
is it watts x volts = amps or something similar?
i worked out on my fuseboard what each fuse could manage Watts wise, and so far ive not had any electrical concerns but the Amps of any given unit seems to confuse me...such that i feel its more a guesstimate than a calculation...