kbennet
The problem with keeping it in water is it requires another pan or something to hold the water, and actually the vaporisation point of normal butane is at the freezing point of water, and the water is cooled by the cannisters cooling, so in fact the water does have to not only be warm, it has to be kept warm. (but not real warm)
Jim
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.