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We featured Miller’s Diversion 180 TIG in the Jan. ’11 “Build a Catch Can” article. It employs the same functionality as the Diversion 165 but includes a dual-plug power cord, giving you the option of plugging it in to a standard household outlet. It also includes a standard foot pedal, which many guys prefer over the torch handle’s thumb controls. Its max output is 180 amps, but it is rated to 3⁄16-inch steel and aluminum, the same max material thickness as the Diversion 165. The difference is that the Diversion 180 is drawing less power to do the same amount of work at max power—it draws 26 amps from your 115V outlet but only 20.5 from a 230V outlet. Both the Diversion 165 and 180 are inverter-based, square-wave machines. That’s industry jargon for a precise and accurate arc at the tip of your torch.