This is version 1. It was used winter of 2010 and 2011 and it worked great. At the time we were living in a rented double wide with no heat. But it had a small fire place. Forced air was provided by a bathroom vent fan. I'm bringing it out of retirement. But it needs to go Lowes as the new place has a much bigger fire place. It's going to get longer taller tubes and 3 more rows added. I should be able to rearrange all the tubes so I can at least reuse everything and just add to my original design. For the fan I would like to use something quieter and DC powered.