I'm considering the purchase of a Hearthstone Castleton and I'm curious about log length. The Hearthstone spec sheet says the stove will accommodate up to 18" but in this site I’ve seen it mentioned that 13" is the max size for the Castleton. I have many cords of ~16" lengths so 13" would be a deal breaker for me. Any insights from owners of this stove would be appreciated. Thanks!