u/Jazzlike_Priority847

Heater is about 3 months old. We do overnight burns with low air on cold nights and cold days we run it with around 20-30% air so that it doesnt throw too much heat and the wood burns longer.

This morning, got it running and burned hotter than we have in a while as the house was pretty cold. It had been running for about 3 hours on full throttle when I noticed a sizzling sound from the flue. Shut it down immediately after the video. No smoke or sparks out the top of the chimney either.