The great news is that all you need to install a Softub spa is a level surface and a standard 220V/ 240V (50 Hz) 10 Amp household electric outlet. Unlike hard, acrylic tubs, which required a concrete pad or reinforced platform to support their heavy weight and dedicated 220v 25 Amp electrical outlet, a Softub spa is the go-anywhere hot tub, drawing just 6 Amps.