100% capacity at 5 degrees is 10600 with a rated capacity of the same at 47 degrees but it still produces more heat at 17 degrees 12,200 or 18,000 at 47 degrees but the power rating at 47 is based on the 10600 which is the max it produces as 5 degrees. It appears that it is basically a way to get better HSPF numbers by having it not heat at its true max compressor speed for the ratings. The Panasonic's documentation says the max consumption rate right below its max capacity so you can get the idea of how much efficiency it has at that point. I found a link that says that the 9k unit produces 62% capacity at -13f, so 10900*.62=6758 at -13 and 10900*.82=8938. The question is if it is producing that much between defrost cycles and losing some when it defrosts, what are you really left with?
For the 9k:
"Highly energy-efficient system that features 100% heating capacity at 5 degrees fahrenheit, 82% at -4 degrees fahrenheit, and 62% at -13 degrees fahrenheit Base heater is available as an option"
For the 12k:
"75% at -4°F, and 58% at -13°F"
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