Am enjoying the Origo 6000 alcohol stove in my recently purchased 90 H30G, but this week I across another owner who mentioned that they had a fire in their H30 caused by using the oven for a long period of time which ignited the two upper fuel pads. I'm at a loss to understand how such a fire could occur given that the units are sealed stainless steel. Has anyone had a similar experience or offer an explanation?