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Willy you need to define the question better: the boiling point of the water will change as a function of altitude as does the combustion efficiency of the fuel. To provide the same volume of steam at altitude you need a bigger boiler or you would need to compress the air going into the combustion chamber. Jo Thanks Jo , I am a complete novice when it comes to thermodynamics, but being an autodidact i like to find out about things. I do make and say completely wrong statements and then get told and informed about what is actually correct and then i learn stuff !! I am part of a few clubs and things and am always being advised as to what is actually going on ! !! However i still only know what i know. Sorry about this lengthy diatribe but i am a gemini so i have an excuse !!!! I like your work with all your models and wish i could be more prolific with what i do.........