Got it filled this evening used a pc. of 3/4 ply to give even pressure to the stainless lid that came with this 
wood fired canner. The ratchet straps work for now. The pc of galv. pipe is for a heat shield because the strap on the back is kind of close to the stove pipe. 
 
  A pic. with the door open. 

 The water temp is 60 and after 45min. burn the outlet temp from the top hose is 90 and a good circulation is visible in the hot tub.