This chimney like kettle is able to boil water extremely fast because of its design in a camping/survival situation. The stainless steel chimney has a hollow center and has double walls that are filled with water. When placed over the included stove, the water begins to boil on average within 3-5 minutes.
The Kelly Kettle is not “lightweight” by Backpacking Light standards, and it’s bulky (nature of its design: water vessel is integrated). I primarily use it for watercraft (drift boat, pontoon boat) float-camping trips, and seldom take it hiking (too bulky), although I do take it camping in the spring/fall when the focus is on basecamping). The 1 pt version does not have enough water capacity for anything but solo use.
At 13 oz, it’s light enough to take on long trips in wet, cold conditions where I want to make a lot of hot brews.
Having used the Zip Stove and a variety of hobo cans, I’ve found the Kelly Kettle to be the best performing wood burner so far. The volcano effect really does work, and chimney throughput is outstanding. Having the chimney go up through the center of the water vessel is sheer design brilliance for maximizing heat exchange, and the Kelly Kettle does regularly give me a pint of boiled water within 4 minutes of striking the match.
I take small bits of Esbit as firestarters, which means I can pretty much use any fuel I find: twigs, leaves, cones, needles, grass. A few handfuls of reasonably dry crud off the forest floor is about all I need, with the edge given to dead pine needles. Fuel that burns FAST and hot is what you want: twigs are actually the least useful form of fuel because they burn slow.
The Kelly Kettle is very well made, has a wonderful history about it, and just plain works.