John, we run our dual fuel Maxpeedingrods MXR3500S on propane without any issues. I prefer propane vs gas - it's cleaner burning, more eco friendly and lower maintenance. However, with propane you lose energy output, on our MXR3500S the specs are: Peak Wattage: 3500W (Gas) / 3100W (LPG) and Running Wattage: 3200W (Gas) / 2800W (LPG).