Copying from the specification sheet (.pdf) for Rheem furnace RGFD-07EMCK as follows:
Input-Max BTUh 75,000
Heating Capacity Max 72,000
Heating Capacity Min 28,200
I was under the impression that:
Heat input X AFUE = Heating Capacity
If this is true, then there are discrepancies in the document:
75,000 X .928 = 69,600, and
30,000 X .928 = 27,840.
Also, there are discrepancies listed in other sizes.
If I am mistaken, please explain how the capacities are calculated.