The GS family is based on a common universal control platform, which increases feature flexibility while reducing installation and configuration problems. The GS family has exceptionally good feature flexibilities, so its performance is competitive with much higher-end products. The units incorporate Balboa's patented M7® temperature probe technology, which eliminates the more failure prone pressure switches and simplifies the installalation. System runs at 230V; 3 wires (line, neutral, ground)