I bought a Nuway stove. http://nuwaystove.com/product-category/propane-stove/ It is a propane stove that vents to the outside like a wood stove. I had a 3 man Frabill un-insulated pop up. The windows are velcroed in. I simply removed a window, traced it onto a piece of aluminium sheeting, cut it out and stuck velcro on it. Cut a three inch hole in it for the exhaust pipe, stuck the aluminium back in the window spot, and it worked like a charm. Also ran it in my snowtrekker canvas tent this fall, let it run all night for a few nights. No moisture or CO worries. I’m going to buy the Eskimo 650 this year, and do the same window trick, I figure I’ll be able to run the stove on low and keep it warm. Here’s a shot in my canvas tent.