Sabre, can you at least describe the basic type of stove you have that boils 4 cups in 4 minutes? From the http://zenstoves.net/Stoves.htm link:

1. Open Flame
2. Chimney/Updraft
3. Low Pressure SideBurner
4. Open Jet
5. Hybrid SideBurner Jet
6. Pressurized Jet

How much fuel does your stove use to do that? I've gotten that fast a boil, but with TWO cups of water, not four.
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dk