Question about High Efficiency Boiler

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: Hi Boiler Room Team : I have 3 questions for the Board in general. : It concerns the installation as follows : http://boilermachinery.com/mark/mark2/Photos_SCANS/DeadlyMunchkin/605576-R1-16-9.jpg : http://boilermachinery.com/mark/mark2/Photos_SCANS/DeadlyMunchkin/605576-R1-18-7.jpg : I've included links to pics for the replacement outside installation, replacing the Munchkins and related new propane lines... : Note the way the new propane/gas line has been installed in the basement for the new outside once through heaters. : http://boilermachinery.com/mark/mark2/Photos_SCANS/DeadlyMunchkin/South_MunchKin_VENT_PropaneRun.jpg : yellow line is the propane line, white 3 inch pipe is the exhaust and fresh air intake for a "199" Munchkin. : total combined length is over 120 feet ! : note the supports : http://boilermachinery.com/mark/mark2/Photos_SCANS/DeadlyMunchkin/605576-R1-23-2.jpg : http://boilermachinery.com/mark/mark2/Photos_SCANS/DeadlyMunchkin/605576-R1-24-1.jpg : there's over two hundred feet of this yellow propane flexi line in this crawl space : http://boilermachinery.com/mark/mark2/Photos_SCANS/NEWheaters/605576-R1-10-15.jpg : http://boilermachinery.com/mark/mark2/Photos_SCANS/NEWheaters/605576-R1-08-17.jpg : THE TWO questions; : 1- The Munchkin was set up to burn Methane, not propane. The town site provided propane. Given the possibility that the contractor at least installed the proper burner orifice for a propane source, but still considering how the vent and intake were installed. How long do you think it might take for this boiler to fail and from what specific cause? : 2- The yellow propane line, run throughout this basement area. Over 200 feet worth. : Can you see any problem with the new installation and related propane line? : 3- When a high efficiency unit is operating, what would be the % CO output of such a Boiler's furnace? : Can you aee any other tell tale problems. The Munchkin ran for over one year, before and incident caused it to be turned off, and a new outdoor system put in its place. I wonder how long it would take to fill up the vent with water and even sooty residue, if propane was burned in a methane unit without the proper conversion being made. : By the way here's a far better installation of the same Munchkin Model. : http://boilermachinery.com/mark/mark2/Photos_SCANS/NE_NativeCenterLincoln/Munchkin2.JPG : http://boilermachinery.com/mark/mark2/Photos_SCANS/NE_NativeCenterLincoln/Munchkin3.JPG : The Munchkin is a very good unit, but as you can see from the pics at the top : ...well feel free to comment. :)