BlazeKing inserts; How to measure stove output?

[sepidpooy]

I was wondering how people here measure the stove output of blazeking inserts since the cat thermometer is just an on/off switch and doesn't really tell how much heat stove is projecting in the room.
I have a thermometer in a room but it gets noisy results since many things in the room other than stove impact room temperature.

I was thinking to buy a wired digital thermostat and tape it to the chimney liner but that required moving the insert out.

 

[Highbeam]

Weigh your fuel load, time how long it lasts, apply the appropriate efficiency rating, calculate average btu per hour that your stove was “putting out”.