I used a gravity feed pellet stove for a couple years in a 12x14 wall tent and it worked great. The biggest thing with these type of stoves is keeping them drafting. Sometimes ash buildup is an issue. They do put out a lot of heat and picking up bags of pellets while out of state is a lot easier than finding firewood.
Yeah I've had a major issue with my stove in the alaknak back drafting... I run a cylinder stove but that crappy eastern wa pine wood might light easy but it sure cokes up the flue and doesn't have a ton of BTU....I've woken up a few times in super cold temps (+20f to -10f) when the stove turns to coals and starts back drafting....
Frankly if I could just get an unlimited stash of birch wood I wouldn't be asking these things...
Interestingly enough, I have a Dickinson diesel stove in my fishing boat and I've almost been killed a few times by a diesel stove back drafting on other boats but when I got my boat I replaced the stove and also at the same time installed a barometric damper, and lived on my boat for 2 years with zero back draft issues.
But for me, when I take the wall tent out, I'm usually either at an event/festival, or I'm hunting in a place only a lifted jeep will go and I've found my self more often than not setting up in the dark- playing the firewood game. The idea of grabbing half's dozen bags of pellets and a propane torch and maybe a handful of newspaper sure appeals more than worrying about wet wood/no wood/bad wood/green wood/frozen wood....
Perhaps I should have made the subject of this thread "pellet stove in a wall tent"