After my daughter had complained that the drinks were lukewarm only on the old thermos in the first big break, I bought these thermos. Now she complains that she has to leave the drinks to cool down again, so as not to scald (.. and this until the end of the school day).
One reviewer complained about lack of warming performance. Here, a look in the manual: The bottle should be preheated before filling some Minten by filled therein boiling water to reach their optimum efficiency. Although this is not always necessary, in extreme cases, the metal of the bottle may be so cool that they once cut off the hot liquid to be held a lot of heat before it begins to keep warm.
