Using hot water will not cause problems, as long as you don't immediately flush your glass with ice-cold water.
Like most all glass, going from very hot to very cold will cause the glass to shatter.
The only exception I can think of to this rule is the prince rupert glass drop
Cool stuff. Would goin from super hot tap water to super hot cold water be enough to damage the integrity of the glass? I did this on all my other pieces, but am going to be more carrful with this new piece.