Hot fires always burn cleaner... or do they?

The easiest way to clean up a wood stove fire is to burn it hot, so many manufacturer's use thermal combustion (hot secondary combustion) to make their stoves burn clean.  The problem is, as you can see in the chart above, is that a hot fire is not a long burning fire. 20 years ago when emissions standards were not as strict, you could acheive a decent overnight burn and still be relatively clean.  With 2020 emissions standards many stoves are now lacking adequate low burn rates.  Kuma's Hybrid technology uses thermal combustion combined with a combustor that actually lowers the temperature at which wood smoke burns!  Because of this our stove burned for over 5 hours longer than our competitor's stove during it's emission testing.