I remember trying it out of hot water once and it got really foamy and the hit tasted weird to me. If I had an ice catcher I would try actually if I had a bong I would try but some moron (me) broke it. Actually I think it was shotty workmanship because it just fell over on the carpet and the damn thing seperated into two with a clean cut between the curve of the tube part and the bottom part. The damn edge is so sharp I cut myself pretty good picking it up and didn't even realize until I saw the blood running down my hand. Never buying another glass bong again.