First, second and third degree burns
I have two multi-fuel stoves and two open fireplaces in my house and I burn timber, leavened if necessary with a little turf. The stoves are more efficient than the fireplaces and safer if I’m burning timber that sparks.
But the open fireplaces are more fun because I can fiddle with the logs to get them burning the way I want them and because I can see, smell and enjoy the fire better.