Dawn White : Lots of good information shared here ! The scale is hard to judge, but Because the Stove appears to be less than 5 Cinder blocks tall I
think that it is smaller than it otherwise looks in the picture !
The 1st piece of stove pipe just above the stove is a Specialty Piece of Stove pipe with an oval shape where it sets down onto or over the stoves oval
shaped exit hole. These pieces usually come in two different lengths- Yours is the shorter one
90 % ( Best guess ) of the time this means that this pipe is a 7 '' oval reducing down to 6'', These are a specialty item and often are not changed out
until they are in poor condition, You will be lucky to find a replacement easily. When you do please post the When and Where !
My
Experience with Stoves built to be Coal Stoves is a part or full lining with a Monolithic Fire brick core - most wood stoves can burn coal, and even glow
a dull red and still last a long time, it is when they are over fired to a Bright Cherry Red that damage occurs ! Y.M.M.V.
The Galvanized Elbow at the top of your stove pipe stack has already been heated above the temperature that causes the ''Outgassing of Zinc Vapors''
and the remaining Galvanizing is mechanically bound to the stove pipe in a safe manner ! Only a close inspection will tell you if it needs replacement now,
when it is time to replace the elbow do go with Black Stove Pipe that is not Galvanized and is of a heavier gauge metal !
I posted a link to another
thread where the condition of the grates are mentioned ! See link below :
https://permies.com/t/48317/wood-burning-stoves/Heartland-Sweetheart-Woodburning-Cookstove
For the Good of the Crafts ! Big AL
Late note The piece of bright shinny sheet metal behind your stove
should be fastened to the wall with an air gap at the bottom top and behind it !
This would be mandatory with a wall of wood, or sheetrock over wood, but is highly recommended here, also the air gap helps radiate most of the heat back
into the room warming you not the wall ! Important when building that 1st fire with each visit to your property ! A.L.