We decided to go with the second pellet stove in our basement. Though, we are going to keep the fireplace and skip the insert and put a second free standing one. I am considering getting a used unit, looking at craigslist etc. Besides the obvious question I have to ask the person of is it hooked up, or is it outside and can I run it to make sure it works. What are some other tips in either things to ask, or things to look for in a reliable used unit?