6" single wall split pipe. It was just installed this year; 1st year burner. I noticed this slight change over the past few weeks. The only thing different with regards to the stove has been a cast iron tea kettle we leave up top to boil water. It sits somewhat near the stove pipe. And since we leave the top of the kettle open (to prevent boil over), I suppose the "steam" could be hitting the pipe.
I'm OCD about the stove temp. I do my best to keep it 600F or under per Jotul. I use a stove top thermometer to keep an eye on the temp.
I'm OCD about the stove temp. I do my best to keep it 600F or under per Jotul. I use a stove top thermometer to keep an eye on the temp.