Ok guys, I know 212 is boiling here in good old Cleveland. I'm trying to get a vigorous boil going so that if needed I can boil off more water. Again, this is a gentle rolling boil. I'd probably have to do about 2-3 hour boil to boil off a gallon the way it's working. So the question to people who have a Gen 4, are you able to get a vigorous boil? And no, I've only recently been reading about the temperature calibration issues. I ordered the heat exchanger and will calibrate the thermometer once I get that installed. Either way, setting it to 225, 13 degrees above boiling, should have taken me to a pretty vigorous boil I would think. Apologies if I emphasized the temperature, that wasn't the point.