I make leather dressing out of beeswax, rendered deer fat and a couple other ingredients. I've given away a good bit of it here and at Mojam and always hear good things back. I kinda jokingly call it "Bulla-Bulla Boot Butter". Usually I make a big ol' stock pot full of it and pour it into small tupperware type dishes. I melt it directly on the stove and have never had an issue.
Bee's wax is flammable but you need either direct flame or some pretty intense heat. A normal stove burner set on med/low works just fine. Now, don't go ladling it out of the pot or try to pour while the burners are lit or anything like that but just heating it to melt? No need for a double boiler. Electric burners might be tougher to regulate but gas is easy.