The manufacturer recommends before pouring of hot drink, simply to pour hot water into the pot to heat the walls. This guarantees that the drink can be kept warm for longer. In fact, according to this approach, it stays ungefährt 6 hrs. Good warm. However, since I have the comparison to a Alfi jug, I must say that the insulation performance is much better.
So who puts on a long insulating performance value that would be better advised to Alfi products. However, if you just look for a solid and handy product for a laid table, is the slightly cheaper Isoteel jug also have his joy.
