I'm having a hard time making the heatmap plugin do precisely what I want (namely, to make a heatmap showing not only points but an attribute of those points), and now I'm thinking that I may be misunderstanding what "min/max of full extent" means.
To my mind, the minimum and maximum values QGIS pulls out of the attribute field and displays in the band rendering section should be the lowest and highest numbers that appear in that column. Is that actually correct?
(In that case, my max should be 6500 or so. Instead, it's 10.35.)