On my 10th season with my Kuuma Vapor Fire 100.....

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Rough rule of thumb is that external mag thermometer reads about half of what a probe type will...
 
I have a thermocouple mounted in the stovepipe right outside the VF, it very rarely goes over 400*F...if it does that usually means that either the HX needs cleaned, or computer is turned up, not on low anymore.
280-350 is a pretty normal operating for me, on low, which is where it stays 95-98% of the time for us...might move it up to medium for a "polar vortex" in January occasionally.
 
I have to concur with this I stuck one of those magnet gauges on just for fun a few days and I stayed mostly 175 to 205. So likely internal temp would be over the 250 threshold. However I have found that it burns so clean the temperature swings doesn't really hurt it none. These are very easy furnaces to run by far the safest imo. I have a very similar setup 2 45s about a 20" section of single wall, somewhat shorter 18' chimney 6" insulated stainless inside large brick through middle of house. Baro been on 4 the whole time and flaps fairly regularly.