Victor deep , HORSEFEATHERS !! if you don't have one how can you call it a piece of junk and bad engineering ?
I have one , it does shoot some flames out the top when there is a good fire going and you add wood to it , there is also a cut off for the fan to turn it off while loading and to turn it back on to prevent that from happening , if you stop and think about it this occurs when you open the door to load wood and are introducing a lot of extra oxygen into the fire, you close the door it has to burn it off and does so in a minute or so .
look on their website and you see the new ones have a chimney cap , mine does not , this design has been in place 2 years now.your comments have no logic or basis to them and are just comments out your ass , mine came with three Wilo pumps and I've been running them 2 years and no issue,
bottom line is these things are like auto preferences , every one has there favorite and bash the others ,
the thing the irritates me is the man is asking questions to help him make a informed decision and your comments have no merit or factual basis to them but rather personal opinions , you know what they say about personal opinions and assholes