Based on what i'm hearing here, It sounds like you might have 1 8kw strip, and one 5 kw strip. Just my thought when I read the post.
I seen the guy's talking about 2k ish watts for 3 tons, I know 1 watt is equal to 3.412 Btu's, so for 2k ish watts that be about 8k btu's, Not exactly sure whats meant by those 2k watts. It sounds like the heat pump is putting out more btu's than it is taking in, about 27k more btu's actually.
Look on the outside unit data plate (I assume your unit has one) for the FLA number. FLA stands for Full Load Amperes. It is the current the unit will draw at full normal load. There will also be a LRA, or Locked Rotor Amps number. That is not the one you want.
Multiply the FLA number by 216. Unless you have some sort of weird power, the result will be pretty darn close to the actual number of watts during normal full power operation.
You will have to find out the wattage of your auxiliary heat strips yourself. Just add that number to the number obtained previously to get the total power with heat strips in operation.
Lets say you have a 2486 watt heat pump with no electric strips. The unit uses 220 volts at 11.3 amps.
total Btus = 2486*3.412 Btu's 8482
So, is this all heat pumps put out? A "0.7" Ton heat pump for most residential units? Also, I've seen input ratings and output ratings in Btu's, The input ratings I believe if not mistaken is higher than the output.
If so, it wouldn't even be 0.7 btu's, more like 0.5. half ton, Could this be correct?
It is a Heat PUMP, not a HEATER. A heat pump uses energy to move heat from one area to another. Typically it will move five to ten times as much heat energy as it consumes in electrical energy to power it. A heater will only produce slightly less heat energy as the amount of electrical energy it consumes. Some energy will be lost as sound or possibly even light.