I've been using the
27g Firedragon fuel for quite a while, primarily for boiling 500ml of water for a wee brew. Recently, I switched to a smaller 300ml pot and noticed that the 27g pod boiled the water with less than half of it unused. Consequently, I started cutting them in half as Ozmundo mentioned. I decided to try the 7g pods, which apparently were part of the French Army MREs as well as the Polish at one point, and designed for heating 300ml of water. The one's I ended up sourcing has french translation on them so seems to ring true.
Over the weekend, I tested them when I was out, and I found that one 7g pod was barely able to heat 300ml to room temperature, I was just hoping it was the conditions outside for the day. Returning to the warmth of my kitchen, I try them out again in way better conditions with different setups. One 7g pod, using both the
standard BCB cooker and the
BCB mini cooker, with a titanium 300ml pot (firemaple) and a crusader cup could only achieve lukewarm results with 300ml of water, at best.
According to the
technical sheet for Firedragon fuel, these pods are designed to raise the temperature from 0°C to 55°C in 3 minutes, even after 5 mins when finished the water was still just warm though. I wish I had something to take a temperature reading with but to give an example on how it was, I could easily dip my fingers in the pot without issue.
It could be the fuel I have has been sitting around for a long time before making it's way too me and had its oomph taken out of it, or maybe it preforms better with the
ration heater instead of the two I tried.
Seems like the 14g might be ideal to boil 300ml but I have had zero luck trying to source these as of yet. I contacted BCB about the 7g version, while they do still produce them, they have a large Minimum Order Quantity on them and only sell them via there 3rd party suppliers, I suspect the 14g are the same.