On the depth of the firebox, some may think it's not an issue....but my King is 9" deep. When I projected lows for the week are below average, I empty out the ashes, allowing for more space to maximize load size, because I will be running the stove at a higher burn rate.
I don't recall if I have shared this story before. As many here know, I am an avid hunter. Especially elk. Well a guy from outside John Day Oregon (eastern Oregon) called the dealer to complain about how his 5 year old Blaze King King wasn't getting very good burn times.
The dealer asked if I was headed that way, because elk season was about to open. So I told him I'd be happy to go with him to see the guy. Well, when I got to the dealers shop, we was slammed with customers. So I headed off on my own. Well, it took me about 1 hour to drive to the turn off to his "cabin". It was located on 2,500 acres of elk country! I finally found his "cabin", which was about 6,000 sq ft. His garage was bigger than my house the the contents worth much, much more. His little jet was the topper.
Thankfully, as a bow hunter at that time, elk season is in August so I did not have a hot stove to deal with. I started outside, cap looked great, no build up. Pulled the cap and looked down the pipe. Spotless. All good, so I take off the ol' Kennetrek boots (calf high, so they take time to lace-up).
I go into his cabin and front and center is the King the dealer installed 5 seasons earlier. I open the door and to my wonder, it appears someone has filled the stove with concrete...all the way up to the door opening. So I asked the guy when was the last time he cleaned out the ashes. His response was "You have to empty the ashes?" After 5 years of burning 3 cords while visiting his cabin, he had never cleaned out ashes. I asked him for a pry bar and a 5lb sledge hammer and we them in his shop. It took me about 2 hours of chiseling to get the solid block broken up and out. Of course the bricks were toast, so I told him to call the dealer and get a set ordered.
Great guy. Great looking place. Nice toys. And now he knows he has to empty ashes from a wood stove.