Well this year I wanted to try something different instead of using the pump to circulate water through the copper tubing method. I wanted to build a thermosyphon unit. This one won't be sealed so it will be critical as to the positioning of the barrel next to the tub.
I got the thru-hull boat fitings mounted in the tub.
I also have an idea to shrink the amount of water in the tank so it would heat up faster. The outside dia. of a plastic 55gal drum is about 2'' smaller, so if I cut it to fit inside with 4'' of space off the bottom that should do the trick. Just bolting it around the top lip to keep it in-place. I also have a stainless lid that came with this but it just lays on top. It would be nice to have a sealed lid for it.
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.
I finally welded 8 brackets around the top edge for hold downs and the leaking seems to have stopped. When the fire is going I can really feel the suction on the bottom hose in the tub, the theromosyphone works great.