smthbros wrote:
Several people have lamented the efficiency of rv furnaces, but have provided no documentation to support their claim. This is understandable since rv furnace manufacturers seem to not offer efficiency documentation. I found an atwood spec sheet from '08 that listed input btu at 12000 and output at 9160 which works out to 76%.
http://techsupport.pdxrvwholesale.com/wp-content/uploads/2017/08/Atwood-7920-II-Installation-Manual.pdf
Nice, no current specs list the output BTUs, I used 80% figuring it was on the optimistic side, but looks close enough for these kinds of analysis.