As the title states, I am getting ready to re-wire my whole garage, it will have a 100A sub panel w/ 9 15a outlets, a 20a for my lights, and 2 20a outlets for a 135a/120v welder. My air compressor is 13.5a/120v, so I don't need anything special for it. But what gauge wire for a 50a 240v heater...