Can a Kelly Kettle be used on a Gas Hob?
The Kelly Kettle is not designed for use on a gas hob and while it will boil on a hob - it will be significantly slower than if sticks etc. were used.
The Kettle has been designed to work super fast outdoors in all weather conditions, using whatever natural fuel you find lying around!
In short, if it burns you can use it! The secret to a fast boil is to get an inferno going inside in the Chimney. As the fire is safely contained within the fire base and the chimney of the kettle itself, all the flame and heat is directed upward along the chimney walls - rapidly heating the water on the other side of the wall.
If you do choose to drop the kettle onto a gas hob or an open fire (the kettle is not designed for this use) it may help to partially cover the chimney top with something to trap more heat inside.
Sticks will always beat a gas hob as the gas never gets a full scale inferno going. :-)
The following in this FAQ should be helpful regarding what can and cannot be used to boil the kettle.
What types of fuel can I use in my kettle?
Can an alcohol burner be used with the Kelly Kettle?