I got the pro piezo model in that link. The fuel goes for a while... i'd guess more than 15 minutes depending on how high you have the flame... i haven't timed it. And there's NO problem with it not being hot enough... This sucker gets insanely hot. The nice thing is that the piezo ignition makes it easy to start it and stop it, and it heats all the way up in about 15 seconds, so you can stop it when you don't wanna waste fuel.