However, looking at the picture, you’ll see it’s an advanced technique that requires some tools and real effort to build. I’d recommend you practice this one a few times before you’d need to depend on it.
In fact, I wouldn’t spend the energy to build this in the wild, in a survival situation, unless you’ve got a group of people to keep warm. Plus you’ve got the time and energy and your food supply is not a question.
The payoff? A fire that can put out lots of heat and (if you build it right) last about 15 hours without adding more effort.
You’ll need a good saw and/or axe. Plus some cordage to tie the frame together. Along with a digging tool, such as a small shovel (or even a stone, in a pinch.)
Build the frame by using cord and knots to lash sturdy forked logs as shown to fairly straight, green (not dry wood, but from a live tree), small logs about 4 feet long and about as big around as your arm. Note that the “V” shape of the frame allows the big logs in the center to touch the ground. So the logs that make the “V” do not touch at the bottom of the V shape.
Also note that the ground is hollowed out into a small trench between the two big center logs at the bottom of the “V”. This allows more air flow to help get the fire started.
You’ll also see the two smaller, green (not dry) spacer logs sticking up at the bottom of the “V” between the two center logs. These allow enough room to put tinder and kindling between those two big center logs.
A hot, well-established fire will eventually burn those two big center logs, and the next logs above them in the “V” will fall down and start burning. As long as you have a steep enough angle on your “V” shape. It’s also important that your big logs are dry, seasoned wood from dead trees.