Mac if you keep the tem just luke warm then i dont think you will break any glass, do you use the hot water all the time now ...Im fitting mine tomorrow i bought 2 heavy duty metal bars which I plan to put across the back doors and fit the shower to them what worries me if when working with the doors open what happens if it rains and goes down the flute, also do you turn the gas bottle off after every job or just at the end of the day any feedback would be great cheers Rich ...