I did some calcs once and worked out that my little Coleman stove could put out around 5kW of raw heat. Not bad for something you can hold in the palm of your hand. [biggrin]
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I have never had any dramas with the butane stoves But then again I am not crazy enough to go camping in the cold[bigwhistle]
Lee knocked up mean stir fry in his stove last month and it was almost snowing , my 18yo Korean cheapie has never been a problem and mostly use it in winter.
Used one just recently (butane stove, that is). My solution is to have two or three canisters, and swap them out every couple of minutes. Irritating, but I'm still using the $12 stove I bought about 8 years ago - not much else you can get at that price point that'll last that long! [thumbsupbig]
I used to put our canisters in stubbie holders and keep them in the car or tent. Swap them out as needed.
I was living in a caravan park - camping for a few weeks in Canberra during May. I used a cheapie- I think $12 rings a bell. They always worked. However this was mostly of a late afternoon.
I don't think I want to go LPG due to carrying one around.
I want light and cheap.
Geez, camping in Canberra in May would have been a blast... [emoji16]