I think you will be more than warm enough for the 20s with the Burrow, IF you can avoid drafts, particularly as you move in your sleep, and when you are on your side. That is the entire ball game IMHO.
I think it is easier to avoid drafts with even more narrow quilts in a hammock than on the ground. Because most hammocks wrap around your sides more or less, making it easier to keep a quilt tucked. I think the only way you will know is to practice and try it out. The 3 season Burrow has 3.5" loft, which I suppose is top layer only? If that is indeed top layer only, this quilt is way under rated at 20F. But even a small draft will ruin the warmth.
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