I guess this is considered a double boiler but it's not called that. I just made some candles last night, I used a small pot and filled it abou 2 inches with water so the pot wouldn't burn dry and then I had a small metal dish about 3 inches high and that's what I put the wax in. The dish didn't have a handle so I used tongs to pick it up and pour the wax into the molds. You just can't let it boil because boiling breaks down the properties of wax.. . I did end up getting wax in the pot but it was easy to come off since there was water in it, so just use a pot that you don't care much for.. . . You can also use those dishes they make for tealights and oils/scented candles without the wicks. They don't hold much but if you have a small dish that can fit over that, you'll melt the wax a lot slower since it will be heating up by a tealight source. Or if you have a small fondue pot...It looks the same as those things for the oils but it's a little bigger and you can fit a can of sterno fuel in them and then the dish above will hold the wax.