I have double wall pipe and I'm not interested in adding an internal probe due to it being a telescoping pipe. Just for curiosity sake has anyone been able to see any type of relation between internal and external pipe temps? I know single wall is around half, I remember reading somewhere with double wall it's around a third. Every once and a while I hit the pipe with my IR gun just for kicks and figured I'd ask if anyone with both has noticed how they correlate to each other.
If my external temp is 300 could it be 900 internal, or 200 external could be 600 internal etc....
If my external temp is 300 could it be 900 internal, or 200 external could be 600 internal etc....