A Kelly Kettle / Volcano Kettle will boil water in 3 to 5 minutes depending on the fuel you're using. Made from aluminium it is essentially a double-walled chimney with the water contained in the chimney wall. Once the campkettle is filled with water, simply start a very small fire in the base, set the kettle on the base and drop additional fuel (twigs, leaves, grass, paper, etc.) down the chimney.
The large internal surface area of the chimney heats the water very quickly. When the water boils, hold the Handle at an angle of 90° to the Kettle - then lift the Kettle clear of the base.

To pour, lift it by the handle and tilt it using the cork chain.

If additional water is required, simply refill the kettle with water and place it back on the base when the fire is still burning.  Refill the chimney with fuel and you can look forward to a second kettle full of boiling water within a matter of minutes.

Source: http://www.kellykettle.com/how-it-works

3 Sizes -   Large -  2.50 Pints,   Medium -  1.75 Pints,   Small -  1 Pint

My thoughts: The Kelly Kettle is ideal for 1-2 people especially for boiling water. It is not ideal for boiling all the water you need for water treatment purposes because of its small capacity. The Kelly Kettle can also be purchased with a “Cook Set” or small pot that mounts on top of the chimney for cooking. The pot for the small Kelly Kettle is 20 oz. and the large pot that comes with the medium and large size kettles is 30 oz. Ideal for 1-2 people but certainly not designed for family sized needs. I would use a Kelly Kettle for camping trips but prefer a pot and an alcohol stove that has larger capacity, lighter weight, smaller size and multiple functions.

The big plus for the Kelly kettle, is its ability to boil small amounts of water quickly with small amounts of variable types of fuel,

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