Being a favorite of adventures, backpackers, climbers, and mountaineers for over a century, the Optimus Svea is probably the most reliable stove you can get. Climbers all over the world keep turning to the Svea for its outstanding high altitude performance and small, lightweight design.
When dependable gear is a necessity for your expedition the Optimus Svea won’t let you down.
Optimus SVEA 123R (02:15)
I've had this stove for twenty-five years. Quarter century and still going strong. Nothing has broken and no parts have ever been replaced. The design is simplicty itself and it is a well deserved cult classic. If you have one you grow to love it and keep coming back to it. Even though it weighs a little more than some modern designs, it packs really small and has a bomb proof reliablity. When your bivi-ing far from home that reliablity is what counts. This is the "R" model which has a built in nozzle cleaner to clear any soot build up. If you run it on Coleman fuel/petroleum spirit (white gas to Americans) I find this is never a problem anyway. It will run on unleaded petrol but then things do get messy and you have to clean out the tubes after a few months use. The easiest way to do this is by soaking the parts in petrol - the valve key is actually the spanner for taking the stove apart. If you want a good explanation of how it works look up SVEA 123 on Wikipedia.For an ultralight bivi stove try this: http://www.youtube.com/watch?v=n4WQV3p_nuM