When it was 35 below we just turned the stove off and closed up the room. When it's not heated that room drops to almost the same temp outside (sunroom...way too many windows). I started the stove up tonight (it's about 20 degrees out) and it's been burning an hour and a half and the stove is just okay...I can still touch all parts of the stove and the air being kicked out isn't that warm. I truly think I've cleaned it out nicely. And I've read the manual. It makes no mention of weak flame in the manual. What are some reasons for a weak flame? When a stove is that cold, does it just take THAT long to warm up?