Everybody has given great solutions as far as this question goes. I noticed in the initial post, the concern seemed to be more of a BTU question. Butane, Propane, Natural gas, etc are a concern of vaporization on entering the cylinder. It's a dry fuel therefore the worry would more in the line of guide lubrication. As far heat goes, I like to think about my seats for duration of the cycles this thing goes through. It's a bummer that guide replacement is a tad high in Germany. Better safe than sorry I suppose should be the response to that.