I'm getting a 5-6 hour burn time with both vents closed using seasoned hardwood. Sales literature says up to 12. Temps run 600 - 800 degrees. Door does not feel like it seals well, vent handles feel loose. The installer claims everything is normal. (He's extremely busy and doesn't have time to deal with it.) Regardless of distance of wood to glass, it smokes over and the fire is hardly visible. I call BS! I tried contacting Regency customer service directly but no response in 3 weeks. I have 2 other older Regency inserts in another home and get nearly 10 hours burn time on both. Also, I ordered it with the nickel trim kit but it arrived without. I had to wait 4 more months before kit arrived and installer could schedule it. Then we discovered bolts were stipped and trim could not be installed anyway. Maybe I got a substandard COVID unit. Not happy!