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Looks like you're got some incomplete combustion going on there Minnesail, as indicated by the orange flame. Could be a blockage, or perhaps the air mix is not right, or perhaps you've got some junky fuel? I bet you could improve on your test by getting a complete burn on the alcohol.
All that said, alcohol has a significantly lower energy density than all other cooking fuels. And b/c it is liquid, it takes a lot more storage space compared to propane. This was one of my reason for wanting to move to propane (I happily used a pressure alcohol stove for years).
Boiling a big pot of water is likely the only time you'd notice this lower energy density. Most cooking does not require this kind of sustained heating.
All that said, alcohol has a significantly lower energy density than all other cooking fuels. And b/c it is liquid, it takes a lot more storage space compared to propane. This was one of my reason for wanting to move to propane (I happily used a pressure alcohol stove for years).
Boiling a big pot of water is likely the only time you'd notice this lower energy density. Most cooking does not require this kind of sustained heating.
