We Found the 5 Best Double Boilers which you can watch. Hope it'll help you to understand. by the way watch the Best Double Boilers Reviews.
1.Cuisinart 7111-20 Chef's Double Boiler with Cover
http://amzn.to/2z6kluq
2.Farberware Classic Stainless Series 2-Quart Covered Double Boiler
http://amzn.to/2fVXysX
