Coiled 120 foot of half inch copper around the outside of the riser. I should have found someway to fasten the coil of copper to the lid for better heat exposer. Placed fire brick around the fire chamber, don't think the metal will hold up. Added a chimney to draw the heat down over the copper.
Was able two raise 450 gallon of water 2 degrees with a five gallon bucket full of paper and wood.
Going to go ahead and Permanent mount it in the shed, so I can insulate it and set up the controls and pump. Think I'm going to add a batch tank on top of it.