Liked it so much I bought 2 about a month part. The second one appeared to be used but I couldn't determine until I had most of it unpacked. Too difficult to repackage. The second one is the one that needs slight maintenance annually to clean the thermocoupler. No big deal.
Both work well and heat the space needed but not as large a space as I would like. I may need to increase the BTU's if I need to buy again.
A value for the price and I would recommend perhaps with the upgrade model.