I have actually started using hot water quite alot lately. I like the warm feeling it gives me in my lungs, I also find it really fucking smooth, the hotter the better. Although I do love a nice chilled bong hit. Il probably go back after I get over the hot water hits haha. Tell you what though, hot water is proper nice in your bong if you've got a cold/flu, bad throat or something along them lines its really soothing and steamy.
That's a nice long sesh if you are using cold water with ice cubes.. and they are totally gone by the time you are done. You must smoke a massive amount of marijuana.