I tested MSR's Reactor Stove system up on Mt. Shasta this last weekend to see how it did melting snow at altitude. I was very happy with the stove.
9800 ft. elevation, 36 degrees: it took a total of 15 minutes to set up, melt/boil enough snow to refill my 2 Nalgene bottles (1 liter each). That was much faster than my Whisperlite Internationale did at higher air temps previously.
7900 ft. elevation, 29 degrees: took 5 minutes to set up stove and boil one liter of water (not snow melt this time).
Bottom line: this stove is very effective at quickly melting snow/boiling water quickly, even at high altitudes/low temps. I plan to use it on many upcoming climbs. From what I hear from others, it seems to be better than JetBoil systems by far.
-Compact: fuel and stove fit into the cooking pan
-Extremely fast cook times
-No piezo igniter
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