Here's a link to the pot page....that doesn't sound right LOL .... Here's a page to the innards of a Chubby stove. While you are there look around his website....Lot's of good information on how a Chubby works. http://www.chubbystove.com/faq.htm
You might call the factory, very friendly and knowledgeable people (person?) I'm so bad with names...I can't remember his, but when you call you will must likely speak to the inventor and owner. He can tell you things like "Can I buy a new pot with the center pivot?" and "Will it need a new grate?"
I hope you get it running....they do give good heat and will go 12ish hours between fills....even longer if you don't need full BTU's.
With wood, more wood means more heat....with coal, more coal mean more length of time. The heat stays very steady the entire burn. Jusssst before it burns out, it will be making the same heat as it was 10 hours before. Enjoy!
One tip: Coal likes depth. A shallow pile of coal doesn't like to burn as well as a deep pile..... There is a bit of a process to get a deep loading....it's all in the instructions.
You MUST have CO detectors. Do not light the stove without at least one. I have offered many times.... if you can not afford one, message me I will see to it that you get one. Merry Christmas!