WisJim wrote: It has worked well for a couple of years now, but I am thinking of adding a ciculation pump between this storage tank that heats through thermosiphoning water from the wood furnace, and the existing propane water heater that the storage tank feeds into. A circulation pump that ran only when the storage tank was hotter than the propane heated tank would reduce our use of propane even more, I think. And then I need to figure out a place to mount some of my solar water heating panels close enough to the house to be practical, and far enough away to be out of the shade around the house.
I would suggest adjusting your hot water use instead of making your arrangement even more technically complicated. I have an arrangement roughly similar to yours except that mine has a copper coil inside the stovepipe, but otherwise it works the same way. During the cool months it makes way more hot water than necessary, but the tank helps heat the cabin if I don't use the water. In the summer I use a solar water heater of sorts, like you do. Maybe you have a large family? In any case, the key to the future is simplification, not complication...











