Kelly Kettles(*) are extremely efficient at boiling water, fuelled only by a few twigs (of which we have plenty).
Fuel is burnt in a central chamber, and water is contained within the walls of the kettle. As a large internal surface area of kettle wall is exposed to the heat of the fire, the water boils within minutes.
A hard day’s work in the woods is much more appealing in the knowledge that a nice cup of tea is so close.
*Other brands of portable water boilers are available.