Replies

1. 
   Jon_R | Dec 12, 2020 02:52pm | #1

   > The input of the unit is 99,000 BTU/HR output is 119,000 BTU/HR

   About 120%. Definitely one to hang on to :-).

2. 
   charlie_sullivan | Dec 12, 2020 04:15pm | #2

   Guessing from the age, I expect about 80% efficiency. The model number indicates 100,000 BTU/h nominal input, so 99,000 BTU/h actual input sounds right. 119,000 BTU/h must be a mistake, as that should be something more like 79,000 BTU/h, but I'm not sure where that number came from. It's possible that it's actually 119 input and 99 output, in which case it's 83% efficient. That could be the case if it got modified or if the model number is actually 58SS-120-___

3. 
   walta100 | Dec 12, 2020 04:46pm | #3

   If the exact number is not the point, if the vent pipes are made of plastic it is high efficiency condensing that will greater than 90% if the vent pipes are steel it is non condensing less than 83%. I do not recall seeing any models in between.

   Walta