Isn't the Clas Ohlson stove the new model Swedish Army stove called the Jagarkok ?
http://www.soldf.com/jagarkok.html
Happy trails...torc.
I've got a swedish army trangia and it is a good piece of kit, being as it is so versatile, however one thing i have to disagree on is the time it takes to come up to temperature and to bloom. Mine has never taken as long as ive seen here and other places on the net. Because i have two of the military burners i decided to risk one and to experiment. I drilled the jets out with a 1.5mm drill and now it lasts almost as long on one fill of meths but blooms in around 4 minutes and is really going at 5 minutes. Two little things i always do when using the trangia is to put some meths in the burner and then give it a good shake, does this really help ? well i think it does, as does putting the shield around the burner and a pot on top a.s.a.p. as i think this reflects heat back to the burner and speeds it up.
The 25 is a good bit bigger than the 27 but uses the same burner so the 27 will be a little faster perhaps. C.O.? Clas Ohlson stove? If so, great value for money, a copy of the Optimus 91/Tor Purple Flame, the Ranger Stove, used by some Scandanavian forces instread of the Swedish Army alcohol stove setup as it quicker.