I've had the same 10G aluminum BK since I started AG brewing, about 4 years and 70 batches. I recently left my copper IC in it for a few months and think I may have corroded the aluminum, so it may be replacement time. I am considering stainless steel, but want to know any advantages it brings for just about double the price of aluminum. I should mention that I brew in a bag in this vessel (my bag was sewn custom for this kettle). I also have a step-drill (weldless) installed brewmometer and valve installed in the kettle.
-What are the advantages/disadvantages of SS vs. aluminum? -Will I compromise the stainless coating by using a step drill/pilot hole for the valve and thermometer fittings?