These are known by a few different names (Billy, Thermette, BackCountry Boiler, storm kettle, volcano kettle, Kelly Kettle, or Bush kettle) depending on your locale. They all work on basically the same principle of a water jacket around a wood fire to boil the water.
The commercially available varieties are quite expensive however, and when I spotted an old broken electric jug in my favorite local dumpster, I had to have a go at making one.
The process I used involves fabricating a cone out of the same material as the donor jug, and welding it in place, making a donut of sorts.
I've seen copper, aluminum, and stainless wood-fired kettles, this one is stainless steel, and to my knowledge is the first of its kind with transparent viewing windows in the sides.
- donor electric or stove top jug
- donor thermos (optional)
- sheet metal the same as your jug
- fork (optional)
- welding setup
- Dremel tool
- drill & bits
- angle grinder