im2tall
Seasoned , it does make better heat then Pine, by my experience.
Chinese and American Elm, here, are considered a "trash wood" for firewood though. They are tough trying to cut it, very tough to split, lots of dirt/sand/ash to clean up, only burns hot just before it starts to rot, does not coal well, makes little or no heat when wet/green and quite susceptable to rot if exposed to the elements.
The smell of it is far better than Cataulpa or Tree of Heaven(Paradise). It doesn't throw sparks, has a bright flame and once it is seasoned it won't break your back trying to carry it.
Red Elm is as desireable as good Oak around here. Easy to split, straight trunks and branches, high BTU's, nice coals and fragrance.