Quote Originally Posted by d16daily
glass will for sure break with extreme changes in temperature!!!!!

trust me I use to work at a restaurant and glasses use to break left and right when they came out of the washer and someone rinsed it under cold water. .. . . . . .
While your right about extreme temperature change in glass causing weakness and even cracks that does not mean that using this method will break a heavy glass Pyrex bong. The temperature were talking about are not extreme enough. I am a glass artist who makes a lot of pipes and the only time you should have this problem is if the glass was annealed wrong. I wouldnâ??t boil the water but if youâ??re just using hot tape water you will be fine. If something does go wrong that only means the guy who made your bong didnâ??t know what he was doing when he put it in the kiln.