It took a while to prime, in fact, I had to tilt the pump down to get it started. After I got the fuel to the unit which took several restarts, it worked well. I looked at the manual and saw there was an option to prime the pump.To switch the unit to Fahrenheit, you can hold the M (mode) button down for a few seconds and then use the up and down arrows to navigate to the option that says 1.0c. if you press M again, the C will start blinking. Click the up arrow and it will turn say 33.1F. Click M again to save the setting and then Click and hold M to go back to the main menu. Click M to switch between Level and Auto Mode. In Auto Mode it will now show Fahrenheit.If you really want the unit to 'roar', switch it to Level and then crank up the unit to level 6 or 7 (it goes to 10). When in Auto Mode, it seems to kinda stay near level 3 while it gets up to temperature.I'll try to include a video of the settings and the unit in action.I haven't been able to get it to pair yet, but as soon as I do, I'll post a video of that too.