Sycamore. It was crap just last month. Not enough heat to keep up with the cold. Been in the 50's evenings and overnight. I'm starting to get it. This suck grass wood is taking the chill off without overheating. learning the meaning of shoulder season, I guess- first year burner here. Next weeks forecast is in the high 30's low temp, and high 60's- mid 70's. Low BTU wood does come in handy for more than kindling.