This is an old thread, but I was looking up what people were now using for winter camping and came across it.
First, I'll say I'm the guy in the videos that several people linked to reviewing the Svea 123R:
Just to clarify, I do use the Svea 123R for winter camping from time to time. It is plenty fine for melting snow for 1-2 people. Any more than that I'd want either a second stove, or something with more output. I also use canister stoves for winter camping as they tend to be easier/safer to use in confined areas vs. any whitegas stove.
All these stoves have pluses and minuses. For the Svea:
1) Extremely simple. It has one moving part: the valve.
2) The only part I bring for a repair kit is a spare cap in case the gasket on the operating cap is damaged or the safety valve were to activate. I also bring a wick, but I've never had to use it either.
3) The only reason the safety valve will activate is user error getting the stove much too hot. Don't surround it with a wind shield and it will be fine. If you can't touch the fuel tank without getting immediately burned, you are running the stove incorrectly and you should shut it off and allow it to cool.
4) Heat from the stove vaporizes the fuel. The fuel tank gets warm/hot during use, but should never be so hot that you can't hold your finger on it for a bit. The design is quite ingenious as it eliminates external pumps and maintenance.
5) It was made in Sweden where it's cold. So yes, it does work fine in the winter!
6) For an overnight or two, you can just use the built in fuel tank and not bring an external tank with you so you save weight/space
in your pack.
7) Very compact design and extremely rugged.
8) No heavier than an MSR stove when you include all the MSR extras you need with the stove like windscreen, spare parts kit, etc.
1) In very cold temps it can be harder to start. You need to give it a good hot prime to get it going. Maybe even two primes sometimes.
2) I carry a little 4x4" piece of foam I place the stove on if there is snow or a very cold ground. This foam weighs almost nothing and
can also double as a pot holder. The foam allows the stove to reach operating temperature and it will reliably burn even in cold weather no problem.
3) Heat output is not as much as an external pump stove like XGK. So if you are thinking very cold weather expedition or high mountaineering, the Svea may not be the best choice. Although it would still probably work, just slower.
4) I wouldn't use it inside a tent vestibule or near anything flammable just as I wouldn't any white gas stove. I also angle the release valve away from people just to be extra safe in case it were to activate.
Overall, I am drawn to simplicity of the Svea 123R when needed. Mostly I use an alcohol stove for three seasons and I'll even use alcohol for four seasons if I know I won't need to melt snow. Otherwise, I bring the Svea or canister stove.
But the Svea is not down and out and compares very favorably to modern pump stoves. In terms of weight, I think it is a wash once all the extra MSR bits are factored in. In fact, I trust the Svea more and unlike MSR stoves, I've never had the Svea spray fuel all over the place, throw a big fireball, or break due to a pump failure.
Hope that helps...