Can a glass pipe break by getting too hot?

A glass pipe wont ever break from regular or even excessive use. You wont ever get it hot enough unless you hold a flame to it for a unrealistically long period of time. If you are trying to clean it by boiling it in water, (best it Epsom salt is added) it still wont break due to the heat, however it will become very brittle and excessive care is needed to remove it. Once you allow it to cool again it will be just as strong as it was before.