I've never heard about refilling them, but this is what I do. Since there are always scent pads left over after the gas is all spent I buy just the gas. In Walmart go to the aisle where they sell hair brushes, blow dryers and curling irons. They sell cordless curling irons and guess who they're made by, ThermaCell. The gas bottles for them are the same ones, they come in a blister pack two to a package.