Number 5 on the list for the five hottest burning firewood is Red Oak. Red Oak comes in around 24.4 million BTUs per cord of firewood, making it an excellent source of heat for your fireplace. (Checkout the title page to learn more about BTUs and Cords of firewood.)
The easiest way to identify red oak is to look at the tree. Red oak tends to have a darker and tighter bark, meaning less flakey, compared to white oak. The leaves on a red oak and white oak look similar but are different. On a red oak the lobes of the leaves tend to be pointed, and while this tree makes a great firewood it is second to its brother the white oak.