Now, not that I'm trying to start trouble or something, but, have you considered the Svea 123? That would be the little stove that's smaller than a Nalgene in the below photo.



They're very simple: tank, burner, needle valve, pot support. Operates via thermal feed back. No pump. No moving parts other than the valve. Very reliable. Very packable. About the size of a mid size coffee can. This one was built in the 60's. A little battered but still runs great.




Click on this one and switch to full screen mode (F11 in Windows usually):


HJ