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Got picrel in the mail today, because I like the idea of a jetboil, but don't want to pay 80$ for one. I considered getting a high quality clone by firemaple, but I already do have a stove, so it feels wasteful to waste the money on it, and the only thing I am missing out on with this as opposed to a proper jetboil is the locking mechanism and marginally better storage, though I can store my stove in this too.
Decided to do a little experiment, but very small scale because my gas cannister is low and I didn't want to waste it.
The base parameters are: Gas cannister with my stove on it, set to a specific setting that I did not change during the experiment to guarantee constant heat output (the setting was relatively low).
Then I filled both my titanium cup (which I used for boiling before this) and this pan with 60 ml of lukewarm water (same measuring cup, taken from the same container to guarantee they have the same temperature). Then I measured the time it took until it got to a proper boil (not when first bubbles appeared).
The results:
Titanium cup took 2:18 minutes, so 138 seconds total
The new "heat exchanger" pan took 1:59 minutes, so 119 seconds total.
That'd be ~16% faster, and I'm willing to bet the difference would be bigger for larger batches, because the pan is a lot larger than the titanium cup, so it has more thermal mass and thus more thermal inertia initially. I'll have to do an experiment with a proper amount of liquid though, like half a liter or something, rather than such small amounts.
It also fits onto my stove really well to the point where I can shake it a little and it won't fall off. Not quite a locking mechanism, but enough to be nice on uneven ground. Lucky coincidence.
I can store my large 410ml/230g gas cannister, stove and folding fork/chopsticks/spoon inside as well. If I used a small gas cannister I might be able to get my titanium cup in there too.
Given that I paid 11,40€ for this thing I'm pretty happy.