I spoke with Gary today and he mentioned that the phone has been ringing off the hook since this thread has developed. His wife is worried she will be seeing him less because of the increased business. Lets hope he earns enough $$ from the increased sales to take her on a nice long cruise. She also asked that I not post the video on youtube for the same reason. I can relate being self employed and too busy myself without any advertising so I will respect her wishes. If anyone here is serious about his boiler Gary will mail you a copy of his video. Garnification, Gary's plan is to build my boiler as a three pass. 9"x 5' single tube with ceramic liner off fire box to 9/2"x8' tubes back to front, then 9/2" tubes out the rear to flue pipe and two speed draft inducer bolted to existing masonry chimney. I might test the unit with and without firebrick in the firebox after burning a few months as is but who knows maybe its not needed.