I bought a small heater with the mesh lid just before Christmas. Bessie mate who was plant sitting while we were away, actually managed to burn the mesh right through so now there's a hole where the mesh was together with a ton of soot !

The other twin thingy heater in the 6'x8' g/h has coped well in the weather. I open the door once a day and everything inside seems to be doing OK. The smell actually doesn't bother me too much and I fill mine with a funnel and keep an eye on the level inside the funnel. Only overpoured once so far.