Alcohol doesn't vaporize well in freezing temperatures, so for best performance in cold weather, the stove should be heated. Trangia sells a winter attachment for Trangia alcohol stoves that places a cup of alcohol under the stove. It may seem surprising to heat a stove with what is in effect another stove, but it is a simple and effective technique.
The biggest downside to unpressurized alcohol stoves is that they only produce about half the heat output of a white gas, butane or propane stove. This means cooking times are slower and you need to carry more fuel.
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