I keep hearing this (much repeated) theory of a "break-in period", here and in other 'log vape' threads. Goes something like this, " And, the PD does have a break-in period, while the wood is drying out..."
People get confused, or don't read, and think all the "log vapes" are made the same. And, what you read about one applies to all. This is
not the case.
We purchase Kiln Dried (KD) furniture grade lumber, we also perform a second Kiln drying operation after initial boring, one of the reasons it takes me longer to make a Purple-Days. Residual moisture is not a factor with a Purple-Days.
It may be true, as reported here on FC, that other log vapes (one at least) have a "break-in" period, while the partially air dried (PAD) wood they use, looses it's moisture. Not saying it's a bad thing, or a bad product, just saying that there are major differences in our production techniques (and internal designs).
Folks speak of a learning curve with almost all vapes. You learn to control draw speed, grind consistency, load size etc., etc. with continued use. But, because one mfg. (of "log vapes") uses PAD wood, and there is a drying out period ("break-in"), in addition to the learning curve, it is assumed that all "log vapes" have this drying period.
I believe, Todd at Woodeez has stated, that he uses KD wood also, though he probably doesn't do the P-D second Kiln operation (don't know). I have never seen mention of Kiln Dried wood from the other mfg. and I can believe reports on FC, that it takes some time to dry that product out. Don't know that for a fact, just see it reported and repeated often, that's why it gets brought up here...
From unit to unit (all other variables held steady), variations in wood density and body diameter (both affecting R-value) will cause temperature differences.
Beyond that, comparing one product to another, the Purple-Days heat exchanger has considerably more surface area to release heat into the air stream, purposely designed to release more heat, including the extra expense of black oxide coated fins.