Hi, I'm new here. I have two pellet stoves one I'm having a problem with my older one. It's a Bosch. It's about 6 yrs old , used plenty in winters past with no issues. Last winter I cleaned it & fired it up. I noticed a smell that would burn my throat. It was unbearable. So this summer I opened the windows and fired it up about 3 times as hot as she would go. The smell is horrible. It can't be paint, as it's not new. Could it be old pellets that have been sitting ? I'm thinking no be there's no smell in the hopper ( where the pellets go right?). My husband put a tape or a caulk on the pipes awhile back & he's thinking it's the adhesive burning off. I would normally agree but , the last time I let it burn it was for about an hour and a half full blast. The smell was so bad I had to open all the windows for hours and had to leave the house. Any and all suggestions would be appreciated. Thank you