What does AFUE mean?
AFUE means annual fuel usage efficiency. The AFUE test is a test that is used to rate products so that all manufacturers heating products are rated the same. This test has to be done in a laboratory. To you this means that the quality of the installation as well as the AFUE of the equipment has everything to do with how well the equipment performs in your home. The installation has to take into consideration the correct duct sizing and fuel line sizing just to mention a couple of items.