In reply to purplemonkeyelephant:
www.primus.eu/knowhow/downloads/user-manuals
Do you mean gas as in propane/butane or petrol?
On the hill, lacking a convenient air compressor, boiling water with the nipple in the pan, assuming you have a spare stove, can be quite effective.
UKC folk, who have managed to last more than a few months on here, will recall this was discussed a while ago