I am purchasing a brew pot for all grain batches and i have a question I can get a 10 gallon pot that is 1.2mm thick for 170 or a 15 gallon pot for 180 that is 1mm thick, is the thickness of .2 mm difference should that be a factor in this decision I woul like the 15 gallon for 10 gallon boils in the future, any help from you veteran brewers would be much appreciated...thanx