At our office, we've got these huge coffee machines. One on each floor. These monsters have three burners, brew a pot of coffee in under a minute, and can burn an entire pot of coffee in less than 1/2 hour. Not coincidentally, the stuff is so hot that it's undrinkable until it cools for several minutes.
On the first floor we've started using air pots. The coffee stays at a pleasant temperature without burning for hours. Why would anyone make a coffee machine that burns coffee so efficiently? Maybe it's because we were silly enough to get our machines from the same company that supplies our coffee? After all, the only cure for a burnt pot of coffee is to brew a fresh one.