What shouldn't go in your compost bin?

I have two questions to ask regarding this thread
1/ is the green johanna hot composer as good or better than the Hotbin Composter
2/ would a paraffin weed burner be hot enough to kill off the roots of ground elder and couch grass, as it is pressurised it pushes out quite a high temperature

I've never used a weed burner but I don't believe it would be worth doing. The amount of roots that I dig up from a border is pretty large. They are very thicvk and I can easily fill a when barrow in half an hour. Maybe if my border were smaller and I got to them every week but I can't hand dig the whole garden weekly. It grows back quite fast.