Interesting design. It gives allot of area for heat to transfer from the fire to the water. You should be able to use the water pot portion over any gas stove.
A good review here:
7 minutes from fire light to boiling water on a 28F day using newspaper and damp twig wood. Boiled too quickly for him to get his grilled cheese sandwich cooked. Under 1 minute for the pot to cool down after water was removed.
With a cookie sheet and a tile stand you could then use it on top of a picnic table.
An issue I do see is using it to melt snow. You'd have to stuff the snow in the relatively small hole.