Ordered the Edelmetall and thought it was going to blow me up. Several others had similar experiences where they tell you now to tighten the gas bung the whole way, but then when I lit it a giant fireball came out.
Mine actually back fired one time on me. But I had the air damper wide open from the previous boil session. Now I just close the air damper when I light it and haven't had an issue since...