Home / Home / 10-gauge is the right choice for a 2000-watt heater at 75 feet.Home 10-gauge right choice 2000-watt10-gauge is the right choice for a 2000-watt heater at 75 feet.10-gauge. The 12-gauge will probably work, but you Search AmazonAs an Amazon Associate, Work Notes may earn.Related NotesExploreExploreExplorePrevious 100 feet is fine for a 12-gauge cord on a 15-amp miter saw.Next 10-gauge for a 15-amp table saw at 100 feet.