Basically, a double boiler is just two cooking pots. One goes on top, on the rim of the other, leaving a cavern of empty space in the lower pot. With some models, one pot is shallower than the other, and it sits on top of the bottom one, dipping down into it a little but still leaving empty space between them.
This item Vintage Pyrex Flameware Double Boiler 6283 Farberware Classic Stainless Series 2-Quart Covered Double Boiler Stainless Steel Double Boiler Pot for Melting Chocolate, Candy and Candle Making (18/8 Steel, 2 Cup Capacity, 480ML)
Forget the Double Boiler; Try This Instead! ... (this is where my extensive Pyrex collection — all of which I do use — comes in ... To use as a double boiler ...
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I love my Pyrex double boiler, which is about 45 years old. I used it on coil electric with the triangle diffuser that watchmelol mentions, but have used it on my glass top without the diffuser for many years now. I don't turn up the heat all the way, though.